From 41204622fa56763e4fe5575ef8b72277c09b7011 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Fri, 14 Oct 2016 23:56:47 +0300 Subject: [PATCH 01/42] Initial commit with IDEA project and abstract classes declaration. --- 05-FP/.idea/compiler.xml | 26 +++ 05-FP/.idea/copyright/profiles_settings.xml | 3 + 05-FP/.idea/gradle.xml | 19 ++ .../libraries/Gradle__junit_junit_4_11.xml | 11 ++ ...Gradle__org_hamcrest_hamcrest_core_1_3.xml | 11 ++ 05-FP/.idea/misc.xml | 57 ++++++ 05-FP/.idea/modules.xml | 10 ++ 05-FP/.idea/modules/05-FP.iml | 12 ++ 05-FP/.idea/modules/05-FP_main.iml | 13 ++ 05-FP/.idea/modules/05-FP_test.iml | 17 ++ 05-FP/build.gradle | 14 ++ 05-FP/gradle/wrapper/gradle-wrapper.jar | Bin 0 -> 53556 bytes .../gradle/wrapper/gradle-wrapper.properties | 6 + 05-FP/gradlew | 164 ++++++++++++++++++ 05-FP/gradlew.bat | 90 ++++++++++ 05-FP/settings.gradle | 2 + .../bachelor2015/veselov/hw05/Function1.java | 4 + .../bachelor2015/veselov/hw05/Function2.java | 4 + .../bachelor2015/veselov/hw05/Predicate.java | 4 + 19 files changed, 467 insertions(+) create mode 100644 05-FP/.idea/compiler.xml create mode 100644 05-FP/.idea/copyright/profiles_settings.xml create mode 100644 05-FP/.idea/gradle.xml create mode 100644 05-FP/.idea/libraries/Gradle__junit_junit_4_11.xml create mode 100644 05-FP/.idea/libraries/Gradle__org_hamcrest_hamcrest_core_1_3.xml create mode 100644 05-FP/.idea/misc.xml create mode 100644 05-FP/.idea/modules.xml create mode 100644 05-FP/.idea/modules/05-FP.iml create mode 100644 05-FP/.idea/modules/05-FP_main.iml create mode 100644 05-FP/.idea/modules/05-FP_test.iml create mode 100644 05-FP/build.gradle create mode 100644 05-FP/gradle/wrapper/gradle-wrapper.jar create mode 100644 05-FP/gradle/wrapper/gradle-wrapper.properties create mode 100755 05-FP/gradlew create mode 100644 05-FP/gradlew.bat create mode 100644 05-FP/settings.gradle create mode 100644 05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java create mode 100644 05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java create mode 100644 05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java diff --git a/05-FP/.idea/compiler.xml b/05-FP/.idea/compiler.xml new file mode 100644 index 0000000..9224652 --- /dev/null +++ b/05-FP/.idea/compiler.xml @@ -0,0 +1,26 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/05-FP/.idea/copyright/profiles_settings.xml b/05-FP/.idea/copyright/profiles_settings.xml new file mode 100644 index 0000000..e7bedf3 --- /dev/null +++ b/05-FP/.idea/copyright/profiles_settings.xml @@ -0,0 +1,3 @@ + + + \ No newline at end of file diff --git a/05-FP/.idea/gradle.xml b/05-FP/.idea/gradle.xml new file mode 100644 index 0000000..89fcdaf --- /dev/null +++ b/05-FP/.idea/gradle.xml @@ -0,0 +1,19 @@ + + + + + + \ No newline at end of file diff --git a/05-FP/.idea/libraries/Gradle__junit_junit_4_11.xml b/05-FP/.idea/libraries/Gradle__junit_junit_4_11.xml new file mode 100644 index 0000000..dc26b34 --- /dev/null +++ b/05-FP/.idea/libraries/Gradle__junit_junit_4_11.xml @@ -0,0 +1,11 @@ + + + + + + + + + + + \ No newline at end of file diff --git a/05-FP/.idea/libraries/Gradle__org_hamcrest_hamcrest_core_1_3.xml b/05-FP/.idea/libraries/Gradle__org_hamcrest_hamcrest_core_1_3.xml new file mode 100644 index 0000000..8262f72 --- /dev/null +++ b/05-FP/.idea/libraries/Gradle__org_hamcrest_hamcrest_core_1_3.xml @@ -0,0 +1,11 @@ + + + + + + + + + + + \ No newline at end of file diff --git a/05-FP/.idea/misc.xml b/05-FP/.idea/misc.xml new file mode 100644 index 0000000..18d93cc --- /dev/null +++ b/05-FP/.idea/misc.xml @@ -0,0 +1,57 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/05-FP/.idea/modules.xml b/05-FP/.idea/modules.xml new file mode 100644 index 0000000..c175ac9 --- /dev/null +++ b/05-FP/.idea/modules.xml @@ -0,0 +1,10 @@ + + + + + + + + + + \ No newline at end of file diff --git a/05-FP/.idea/modules/05-FP.iml b/05-FP/.idea/modules/05-FP.iml new file mode 100644 index 0000000..da422c0 --- /dev/null +++ b/05-FP/.idea/modules/05-FP.iml @@ -0,0 +1,12 @@ + + + + + + + + + + + + \ No newline at end of file diff --git a/05-FP/.idea/modules/05-FP_main.iml b/05-FP/.idea/modules/05-FP_main.iml new file mode 100644 index 0000000..8f27a19 --- /dev/null +++ b/05-FP/.idea/modules/05-FP_main.iml @@ -0,0 +1,13 @@ + + + + + + + + + + + + + \ No newline at end of file diff --git a/05-FP/.idea/modules/05-FP_test.iml b/05-FP/.idea/modules/05-FP_test.iml new file mode 100644 index 0000000..7faa4cb --- /dev/null +++ b/05-FP/.idea/modules/05-FP_test.iml @@ -0,0 +1,17 @@ + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/05-FP/build.gradle b/05-FP/build.gradle new file mode 100644 index 0000000..73ccf9f --- /dev/null +++ b/05-FP/build.gradle @@ -0,0 +1,14 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You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS="" + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD="maximum" + +warn ( ) { + echo "$*" +} + +die ( ) { + echo + echo "$*" + echo + exit 1 +} + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "`uname`" in + CYGWIN* ) + cygwin=true + ;; + Darwin* ) + darwin=true + ;; + MINGW* ) + msys=true + ;; + NONSTOP* ) + nonstop=true + ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD="$JAVA_HOME/jre/sh/java" + else + JAVACMD="$JAVA_HOME/bin/java" + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD="java" + which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." +fi + +# Increase the maximum file descriptors if we can. +if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then + MAX_FD_LIMIT=`ulimit -H -n` + if [ $? -eq 0 ] ; then + if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then + MAX_FD="$MAX_FD_LIMIT" + fi + ulimit -n $MAX_FD + if [ $? -ne 0 ] ; then + warn "Could not set maximum file descriptor limit: $MAX_FD" + fi + else + warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" + fi +fi + +# For Darwin, add options to specify how the application appears in the dock +if $darwin; then + GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" +fi + +# For Cygwin, switch paths to Windows format before running java +if $cygwin ; then + APP_HOME=`cygpath --path --mixed "$APP_HOME"` + CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` + JAVACMD=`cygpath --unix "$JAVACMD"` + + # We build the pattern for arguments to be converted via cygpath + ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` + SEP="" + for dir in $ROOTDIRSRAW ; do + ROOTDIRS="$ROOTDIRS$SEP$dir" + SEP="|" + done + OURCYGPATTERN="(^($ROOTDIRS))" + # Add a user-defined pattern to the cygpath arguments + if [ "$GRADLE_CYGPATTERN" != "" ] ; then + OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" + fi + # Now convert the arguments - kludge to limit ourselves to /bin/sh + i=0 + for arg in "$@" ; do + CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` + CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option + + if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition + eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` + else + eval `echo args$i`="\"$arg\"" + fi + i=$((i+1)) + done + case $i in + (0) set -- ;; + (1) set -- "$args0" ;; + (2) set -- "$args0" "$args1" ;; + (3) set -- "$args0" "$args1" "$args2" ;; + (4) set -- "$args0" "$args1" "$args2" "$args3" ;; + (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; + (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; + (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; + (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; + (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; + esac +fi + +# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules +function splitJvmOpts() { + JVM_OPTS=("$@") +} +eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS +JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" + +exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" diff --git a/05-FP/gradlew.bat b/05-FP/gradlew.bat new file mode 100644 index 0000000..f6d5974 --- /dev/null +++ b/05-FP/gradlew.bat @@ -0,0 +1,90 @@ +@if "%DEBUG%" == "" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%" == "" set DIRNAME=. +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS= + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if "%ERRORLEVEL%" == "0" goto init + +echo. +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto init + +echo. +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:init +@rem Get command-line arguments, handling Windows variants + +if not "%OS%" == "Windows_NT" goto win9xME_args +if "%@eval[2+2]" == "4" goto 4NT_args + +:win9xME_args +@rem Slurp the command line arguments. +set CMD_LINE_ARGS= +set _SKIP=2 + +:win9xME_args_slurp +if "x%~1" == "x" goto execute + +set CMD_LINE_ARGS=%* +goto execute + +:4NT_args +@rem Get arguments from the 4NT Shell from JP Software +set CMD_LINE_ARGS=%$ + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% + +:end +@rem End local scope for the variables with windows NT shell +if "%ERRORLEVEL%"=="0" goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 +exit /b 1 + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/05-FP/settings.gradle b/05-FP/settings.gradle new file mode 100644 index 0000000..c5b4539 --- /dev/null +++ b/05-FP/settings.gradle @@ -0,0 +1,2 @@ +rootProject.name = '05-FP' + diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java new file mode 100644 index 0000000..dd229eb --- /dev/null +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java @@ -0,0 +1,4 @@ +package ru.spbau.bachelor2015.veselov.hw05; + +public abstract class Function1 { +} diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java new file mode 100644 index 0000000..d43c04c --- /dev/null +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -0,0 +1,4 @@ +package ru.spbau.bachelor2015.veselov.hw05; + +public abstract class Function2 { +} diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java new file mode 100644 index 0000000..f4625b4 --- /dev/null +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -0,0 +1,4 @@ +package ru.spbau.bachelor2015.veselov.hw05; + +public abstract class Predicate { +} From 174ec5efdbbe109450bd9b9e2a45a499b070cafa Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 00:36:42 +0300 Subject: [PATCH 02/42] Add interface for Function1 class. --- .../bachelor2015/veselov/hw05/Function1.java | 26 ++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java index dd229eb..e794c05 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java @@ -1,4 +1,28 @@ package ru.spbau.bachelor2015.veselov.hw05; -public abstract class Function1 { +/** + * Class that represents function which can be applied to one argument. + * + * @param Type of function argument. + * @param Type of returning value. + */ +public abstract class Function1 { + /** + * Applies Function to an argument. + * + * @param argument Argument of a function. + * @return The result of application. + */ + public abstract Target apply(Source argument); + + /** + * Composes given Function with method caller. + * + * @param function A Function which will be composed with method caller. + * @param Type of returning value of method argument. + * @return The resulting composition. + */ + public Function1 compose(Function1 function) { + throw new UnsupportedOperationException(); + } } From a92d8a40f74cd61855e1985958b9e3ac6b8827bb Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 00:52:25 +0300 Subject: [PATCH 03/42] Add implementation for compose method of Function1 class. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Function1.java | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java index e794c05..cfee4b6 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java @@ -23,6 +23,11 @@ public abstract class Function1 { * @return The resulting composition. */ public Function1 compose(Function1 function) { - throw new UnsupportedOperationException(); + return new Function1() { + @Override + public ArgTarget apply(Source argument) { + return function.apply(Function1.this.apply(argument)); + } + }; } } From b0e6d385ac57298b15b22472dad23461d11cf07b Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 12:08:15 +0300 Subject: [PATCH 04/42] Add interface for Function2 class. --- .../bachelor2015/veselov/hw05/Function2.java | 57 ++++++++++++++++++- 1 file changed, 56 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index d43c04c..c3807d6 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -1,4 +1,59 @@ package ru.spbau.bachelor2015.veselov.hw05; -public abstract class Function2 { +/** + * Class that represents function of two arguments which can be applied to them. + * + * @param Type of function first argument. + * @param Type of function second argument. + * @param Type of returning value. + */ +public abstract class Function2 { + /** + * Applies Function to arguments. + * + * @param argument1 First argument of a function. + * @param argument2 Second argument of a function. + * @return The result of application. + */ + public abstract Target apply(Source1 argument1, Source2 argument2); + + /** + * Composes given Function1 with method caller. + * + * @param function A Function which will be composed with method caller. + * @param Type of returning value of method argument. + * @return The resulting composition. + */ + public Function2 compose(Function1 function) { + throw new UnsupportedOperationException(); + } + + /** + * Binds function first argument to a given value. + * + * @param argument1 A value to which first argument will be bound. + * @return The resulting function of one argument. + */ + public Function1 bind1(Source1 argument1) { + throw new UnsupportedOperationException(); + } + + /** + * Binds function second argument to a given value. + * + * @param argument2 A value to which second argument will be bound. + * @return The resulting function of one argument. + */ + public Function1 bind2(Source2 argument2) { + throw new UnsupportedOperationException(); + } + + /** + * Curries function. + * + * @return Function of one argument which returns function. + */ + public Function1> curry() { + throw new UnsupportedOperationException(); + } } From 78396bf00567da70344e8c2be066872d067fe50f Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 12:30:03 +0300 Subject: [PATCH 05/42] Add implementation for compose method of Function2 class. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Function2.java | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index c3807d6..1cffa44 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -25,7 +25,12 @@ public abstract class Function2 { * @return The resulting composition. */ public Function2 compose(Function1 function) { - throw new UnsupportedOperationException(); + return new Function2() { + @Override + public ArgTarget apply(Source1 argument1, Source2 argument2) { + return function.apply(Function2.this.apply(argument1, argument2)); + } + }; } /** From 91a909604df64786d36cf5080023fcd234fd0e29 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 12:33:01 +0300 Subject: [PATCH 06/42] Add implementation for bind methods of Function2 class. --- .../spbau/bachelor2015/veselov/hw05/Function2.java | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index 1cffa44..2a629f9 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -40,7 +40,12 @@ public ArgTarget apply(Source1 argument1, Source2 argument2) { * @return The resulting function of one argument. */ public Function1 bind1(Source1 argument1) { - throw new UnsupportedOperationException(); + return new Function1() { + @Override + public Target apply(Source2 argument2) { + return Function2.this.apply(argument1, argument2); + } + }; } /** @@ -50,7 +55,12 @@ public Function1 bind1(Source1 argument1) { * @return The resulting function of one argument. */ public Function1 bind2(Source2 argument2) { - throw new UnsupportedOperationException(); + return new Function1() { + @Override + public Target apply(Source1 argument1) { + return Function2.this.apply(argument1, argument2); + } + }; } /** From 7efee96faa04d1f3deb4b30ea5bcf6591cef35cb Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 12:37:11 +0300 Subject: [PATCH 07/42] Add implementation for curry method of Function2 class. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Function2.java | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index 2a629f9..e8a6c5b 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -69,6 +69,11 @@ public Target apply(Source1 argument1) { * @return Function of one argument which returns function. */ public Function1> curry() { - throw new UnsupportedOperationException(); + return new Function1>() { + @Override + public Function1 apply(Source1 argument) { + return Function2.this.bind1(argument); + } + }; } } From fa2fbc6168a5e7858a610c80d4710659c866a3c9 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 16:38:32 +0300 Subject: [PATCH 08/42] Add interface for Predicate class. --- .../bachelor2015/veselov/hw05/Predicate.java | 49 ++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index f4625b4..c14f965 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -1,4 +1,51 @@ package ru.spbau.bachelor2015.veselov.hw05; -public abstract class Predicate { +/** + * A function of one argument which either accepts it (returns true) or rejects it (returns false). + * + * @param Type of predicate argument. + */ +public abstract class Predicate extends Function1 { + public static Predicate ALWAYS_TRUE = new Predicate() { + @Override + public Boolean apply(Object argument) { + return true; + } + }; + + public static Predicate ALWAYS_FALSE = new Predicate() { + @Override + public Boolean apply(Object argument) { + return false; + } + }; + + /** + * Returns new predicate which is disjunction of current and given one. + * + * @param predicate A predicate to make a disjunction with. + * @param Type of second predicate argument. + * @return Disjunction of predicates. + */ + public Predicate or(Predicate predicate) { + throw new UnsupportedOperationException(); + } + + /** + * Returns new predicate which is conjunction of current and given one. + * + * @param predicate A predicate to make a conjunction with. + * @param Type of second predicate argument. + * @return Conjunction of predicates. + */ + public Predicate and(Predicate predicate) { + throw new UnsupportedOperationException(); + } + + /** + * @return A predicate which is the opposite of current one. + */ + public Predicate not() { + throw new UnsupportedOperationException(); + } } From 64b041bdee74fab513146d034105649e26363be1 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 16:41:06 +0300 Subject: [PATCH 09/42] Mend descriptions in javadoc. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Function1.java | 4 ++-- .../java/ru/spbau/bachelor2015/veselov/hw05/Function2.java | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java index cfee4b6..e22ce2f 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java @@ -16,9 +16,9 @@ public abstract class Function1 { public abstract Target apply(Source argument); /** - * Composes given Function with method caller. + * Composes given Function with current one. * - * @param function A Function which will be composed with method caller. + * @param function A Function which will be composed with current. * @param Type of returning value of method argument. * @return The resulting composition. */ diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index e8a6c5b..ef2a06c 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -18,9 +18,9 @@ public abstract class Function2 { public abstract Target apply(Source1 argument1, Source2 argument2); /** - * Composes given Function1 with method caller. + * Composes given Function1 with current one. * - * @param function A Function which will be composed with method caller. + * @param function A Function which will be composed with current. * @param Type of returning value of method argument. * @return The resulting composition. */ From 0b7837fed53c8d9c6670ffad4f992583ea35e85c Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 16:44:27 +0300 Subject: [PATCH 10/42] Add javadocs to constant predicates. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index c14f965..95e1ddb 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -6,6 +6,9 @@ * @param Type of predicate argument. */ public abstract class Predicate extends Function1 { + /** + * A predicate which is always true. + */ public static Predicate ALWAYS_TRUE = new Predicate() { @Override public Boolean apply(Object argument) { @@ -13,6 +16,9 @@ public Boolean apply(Object argument) { } }; + /** + * A predicate which is always false. + */ public static Predicate ALWAYS_FALSE = new Predicate() { @Override public Boolean apply(Object argument) { From de2eed5c84da90bec9eae88b63b8d0f5dbd02dcf Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 16:49:30 +0300 Subject: [PATCH 11/42] Add implementation for Predicate class methods. --- .../bachelor2015/veselov/hw05/Predicate.java | 21 ++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index 95e1ddb..438bfa2 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -34,7 +34,12 @@ public Boolean apply(Object argument) { * @return Disjunction of predicates. */ public Predicate or(Predicate predicate) { - throw new UnsupportedOperationException(); + return new Predicate() { + @Override + public Boolean apply(ArgSource argument) { + return Predicate.this.apply(argument) || predicate.apply(argument); + } + }; } /** @@ -45,13 +50,23 @@ public Predicate or(Predicate p * @return Conjunction of predicates. */ public Predicate and(Predicate predicate) { - throw new UnsupportedOperationException(); + return new Predicate() { + @Override + public Boolean apply(ArgSource argument) { + return Predicate.this.apply(argument) && predicate.apply(argument); + } + }; } /** * @return A predicate which is the opposite of current one. */ public Predicate not() { - throw new UnsupportedOperationException(); + return new Predicate() { + @Override + public Boolean apply(Source argument) { + return !Predicate.this.apply(argument); + } + }; } } From 3946f6bdf6d9f09e6ae2fe5a038749f7331135ea Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 17:49:03 +0300 Subject: [PATCH 12/42] Replace abstract classes with interfaces. --- .../spbau/bachelor2015/veselov/hw05/Function1.java | 6 +++--- .../spbau/bachelor2015/veselov/hw05/Function2.java | 12 ++++++------ .../spbau/bachelor2015/veselov/hw05/Predicate.java | 8 ++++---- 3 files changed, 13 insertions(+), 13 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java index e22ce2f..6f31004 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java @@ -6,14 +6,14 @@ * @param Type of function argument. * @param Type of returning value. */ -public abstract class Function1 { +public interface Function1 { /** * Applies Function to an argument. * * @param argument Argument of a function. * @return The result of application. */ - public abstract Target apply(Source argument); + Target apply(Source argument); /** * Composes given Function with current one. @@ -22,7 +22,7 @@ public abstract class Function1 { * @param Type of returning value of method argument. * @return The resulting composition. */ - public Function1 compose(Function1 function) { + default Function1 compose(Function1 function) { return new Function1() { @Override public ArgTarget apply(Source argument) { diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index ef2a06c..8ac964f 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -7,7 +7,7 @@ * @param Type of function second argument. * @param Type of returning value. */ -public abstract class Function2 { +public interface Function2 { /** * Applies Function to arguments. * @@ -15,7 +15,7 @@ public abstract class Function2 { * @param argument2 Second argument of a function. * @return The result of application. */ - public abstract Target apply(Source1 argument1, Source2 argument2); + Target apply(Source1 argument1, Source2 argument2); /** * Composes given Function1 with current one. @@ -24,7 +24,7 @@ public abstract class Function2 { * @param Type of returning value of method argument. * @return The resulting composition. */ - public Function2 compose(Function1 function) { + default Function2 compose(Function1 function) { return new Function2() { @Override public ArgTarget apply(Source1 argument1, Source2 argument2) { @@ -39,7 +39,7 @@ public ArgTarget apply(Source1 argument1, Source2 argument2) { * @param argument1 A value to which first argument will be bound. * @return The resulting function of one argument. */ - public Function1 bind1(Source1 argument1) { + default Function1 bind1(Source1 argument1) { return new Function1() { @Override public Target apply(Source2 argument2) { @@ -54,7 +54,7 @@ public Target apply(Source2 argument2) { * @param argument2 A value to which second argument will be bound. * @return The resulting function of one argument. */ - public Function1 bind2(Source2 argument2) { + default Function1 bind2(Source2 argument2) { return new Function1() { @Override public Target apply(Source1 argument1) { @@ -68,7 +68,7 @@ public Target apply(Source1 argument1) { * * @return Function of one argument which returns function. */ - public Function1> curry() { + default Function1> curry() { return new Function1>() { @Override public Function1 apply(Source1 argument) { diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index 438bfa2..cbb1282 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -5,7 +5,7 @@ * * @param Type of predicate argument. */ -public abstract class Predicate extends Function1 { +public interface Predicate extends Function1 { /** * A predicate which is always true. */ @@ -33,7 +33,7 @@ public Boolean apply(Object argument) { * @param Type of second predicate argument. * @return Disjunction of predicates. */ - public Predicate or(Predicate predicate) { + default Predicate or(Predicate predicate) { return new Predicate() { @Override public Boolean apply(ArgSource argument) { @@ -49,7 +49,7 @@ public Boolean apply(ArgSource argument) { * @param Type of second predicate argument. * @return Conjunction of predicates. */ - public Predicate and(Predicate predicate) { + default Predicate and(Predicate predicate) { return new Predicate() { @Override public Boolean apply(ArgSource argument) { @@ -61,7 +61,7 @@ public Boolean apply(ArgSource argument) { /** * @return A predicate which is the opposite of current one. */ - public Predicate not() { + default Predicate not() { return new Predicate() { @Override public Boolean apply(Source argument) { From 67c7423181d34cc9f3f771e611b573cd4aa25c98 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 18:01:17 +0300 Subject: [PATCH 13/42] Add tests for Function1 interface. --- .../veselov/hw05/Function1Test.java | 45 +++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java new file mode 100644 index 0000000..0b993c8 --- /dev/null +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java @@ -0,0 +1,45 @@ +package ru.spbau.bachelor2015.veselov.hw05; + +import org.junit.Before; +import org.junit.Test; + +import static org.junit.Assert.assertEquals; + +public class Function1Test { + Function1 id; + Function1 linear2; + Function1 linear3Shift5; + Function1 quadratic; + + @Before + public void setUp() throws Exception { + id = x -> x; + linear2 = x -> 2 * x; + linear3Shift5 = x -> 3 * x + 5; + quadratic = x -> x * x; + } + + @Test + public void testCompose1() throws Exception { + Function1 id2 = id.compose(id); + for (int i = -100; i <= 100; i++) { + assertEquals(new Integer(i), id2.apply(i)); + } + } + + @Test + public void testCompose2() throws Exception { + Function1 id2 = linear3Shift5.compose(linear2); + for (int i = -100; i <= 100; i++) { + assertEquals(new Integer(2 * (3 * i + 5)), id2.apply(i)); + } + } + + @Test + public void testCompose3() throws Exception { + Function1 quadratic4 = linear2.compose(quadratic); + for (int i = -100; i <= 100; i++) { + assertEquals(new Integer(4 * i * i), quadratic4.apply(i)); + } + } +} \ No newline at end of file From de4b8aa3b7835afa838904b4a7ef87ac8e38b819 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 18:22:20 +0300 Subject: [PATCH 14/42] Add tests for Function2 class. --- .../veselov/hw05/Function2Test.java | 71 +++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java new file mode 100644 index 0000000..cba8c8e --- /dev/null +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java @@ -0,0 +1,71 @@ +package ru.spbau.bachelor2015.veselov.hw05; + +import org.junit.Before; +import org.junit.Test; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertTrue; + +public class Function2Test { + Function1 linear2; + Function1 quadratic; + + Function2 linearXY; + Function2 cubicXXY; + + @Before + public void setUp() throws Exception { + linear2 = x -> 2 * x; + quadratic = x -> x * x; + + linearXY = (x, y) -> x + y; + cubicXXY = (x, y) -> x * x * y; + } + + @Test + public void testCompose1() throws Exception { + Function2 quadraticSum = linearXY.compose(quadratic); + + for (int i = -100; i <= 100; i++) { + for (int j = -100; j <= 100; j++) { + assertEquals(new Integer((i + j) * (i + j)), quadraticSum.apply(i, j)); + } + } + } + + @Test + public void testCompose2() throws Exception { + Function2 cubic2XXY = cubicXXY.compose(linear2); + + for (int i = -100; i <= 100; i++) { + for (int j = -100; j <= 100; j++) { + assertEquals(new Integer(2 * i * i * j), cubic2XXY.apply(i, j)); + } + } + } + + private void testExtensionality(Function1 f1, Function1 f2) { + final int limit = 100; + for (int i = -limit; i <= limit; i++) { + assertTrue(f1.apply(i).equals(f2.apply(i))); + } + } + + @Test + public void testBind1() throws Exception { + testExtensionality(linearXY.bind1(3), y -> 3 + y); + testExtensionality(cubicXXY.bind1(3), y -> 3 * 3 * y); + } + + @Test + public void testBind2() throws Exception { + testExtensionality(linearXY.bind2(9), x -> x + 9); + testExtensionality(cubicXXY.bind2(3), x -> x * x * 3); + } + + @Test + public void testCurry() throws Exception { + testExtensionality(linearXY.curry().apply(-5), y -> -5 + y); + testExtensionality(cubicXXY.curry().apply(-5), y -> -5 * (-5) * y); + } +} \ No newline at end of file From e2e24d20a0c14897266fe06464732a5af901c07c Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 18:26:33 +0300 Subject: [PATCH 15/42] Replace anonymous functions with lambda-expressions. --- .../bachelor2015/veselov/hw05/Function1.java | 7 +--- .../bachelor2015/veselov/hw05/Function2.java | 28 +++------------ .../bachelor2015/veselov/hw05/Predicate.java | 35 +++---------------- 3 files changed, 10 insertions(+), 60 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java index 6f31004..9aca0a7 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java @@ -23,11 +23,6 @@ public interface Function1 { * @return The resulting composition. */ default Function1 compose(Function1 function) { - return new Function1() { - @Override - public ArgTarget apply(Source argument) { - return function.apply(Function1.this.apply(argument)); - } - }; + return argument -> function.apply(Function1.this.apply(argument)); } } diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index 8ac964f..8c32376 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -25,12 +25,7 @@ public interface Function2 { * @return The resulting composition. */ default Function2 compose(Function1 function) { - return new Function2() { - @Override - public ArgTarget apply(Source1 argument1, Source2 argument2) { - return function.apply(Function2.this.apply(argument1, argument2)); - } - }; + return (argument1, argument2) -> function.apply(Function2.this.apply(argument1, argument2)); } /** @@ -40,12 +35,7 @@ public ArgTarget apply(Source1 argument1, Source2 argument2) { * @return The resulting function of one argument. */ default Function1 bind1(Source1 argument1) { - return new Function1() { - @Override - public Target apply(Source2 argument2) { - return Function2.this.apply(argument1, argument2); - } - }; + return argument2 -> Function2.this.apply(argument1, argument2); } /** @@ -55,12 +45,7 @@ public Target apply(Source2 argument2) { * @return The resulting function of one argument. */ default Function1 bind2(Source2 argument2) { - return new Function1() { - @Override - public Target apply(Source1 argument1) { - return Function2.this.apply(argument1, argument2); - } - }; + return argument1 -> Function2.this.apply(argument1, argument2); } /** @@ -69,11 +54,6 @@ public Target apply(Source1 argument1) { * @return Function of one argument which returns function. */ default Function1> curry() { - return new Function1>() { - @Override - public Function1 apply(Source1 argument) { - return Function2.this.bind1(argument); - } - }; + return argument -> Function2.this.bind1(argument); } } diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index cbb1282..3a74f6a 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -9,22 +9,12 @@ public interface Predicate extends Function1 { /** * A predicate which is always true. */ - public static Predicate ALWAYS_TRUE = new Predicate() { - @Override - public Boolean apply(Object argument) { - return true; - } - }; + public static Predicate ALWAYS_TRUE = argument -> true; /** * A predicate which is always false. */ - public static Predicate ALWAYS_FALSE = new Predicate() { - @Override - public Boolean apply(Object argument) { - return false; - } - }; + public static Predicate ALWAYS_FALSE = argument -> false; /** * Returns new predicate which is disjunction of current and given one. @@ -34,12 +24,7 @@ public Boolean apply(Object argument) { * @return Disjunction of predicates. */ default Predicate or(Predicate predicate) { - return new Predicate() { - @Override - public Boolean apply(ArgSource argument) { - return Predicate.this.apply(argument) || predicate.apply(argument); - } - }; + return argument -> Predicate.this.apply(argument) || predicate.apply(argument); } /** @@ -50,23 +35,13 @@ public Boolean apply(ArgSource argument) { * @return Conjunction of predicates. */ default Predicate and(Predicate predicate) { - return new Predicate() { - @Override - public Boolean apply(ArgSource argument) { - return Predicate.this.apply(argument) && predicate.apply(argument); - } - }; + return argument -> Predicate.this.apply(argument) && predicate.apply(argument); } /** * @return A predicate which is the opposite of current one. */ default Predicate not() { - return new Predicate() { - @Override - public Boolean apply(Source argument) { - return !Predicate.this.apply(argument); - } - }; + return argument -> !Predicate.this.apply(argument); } } From 481498f3ad87faef9e1d8db72ce85a92b4f6b91d Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 18:28:13 +0300 Subject: [PATCH 16/42] Remove unnecessary modificators. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index 3a74f6a..0b516e3 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -9,12 +9,12 @@ public interface Predicate extends Function1 { /** * A predicate which is always true. */ - public static Predicate ALWAYS_TRUE = argument -> true; + Predicate ALWAYS_TRUE = argument -> true; /** * A predicate which is always false. */ - public static Predicate ALWAYS_FALSE = argument -> false; + Predicate ALWAYS_FALSE = argument -> false; /** * Returns new predicate which is disjunction of current and given one. From 9c40438361ccf3a4a789516fc23da626623cf03e Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 18:36:18 +0300 Subject: [PATCH 17/42] Add tests with different generic type parameters. --- .../spbau/bachelor2015/veselov/hw05/Function1Test.java | 9 +++++++++ .../spbau/bachelor2015/veselov/hw05/Function2Test.java | 8 ++++++++ 2 files changed, 17 insertions(+) diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java index 0b993c8..b592879 100644 --- a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java @@ -42,4 +42,13 @@ public void testCompose3() throws Exception { assertEquals(new Integer(4 * i * i), quadratic4.apply(i)); } } + + @Test + public void testTypes() throws Exception { + Function1 f = n -> n.toString(); + Function1 g = s -> "[" + s + "]"; + Function1 h = f.compose(g); + + assertEquals("[128]", h.apply(128)); + } } \ No newline at end of file diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java index cba8c8e..19d7473 100644 --- a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java @@ -68,4 +68,12 @@ public void testCurry() throws Exception { testExtensionality(linearXY.curry().apply(-5), y -> -5 + y); testExtensionality(cubicXXY.curry().apply(-5), y -> -5 * (-5) * y); } + + @Test + public void testTypes() throws Exception { + Function2 f = (n, s) -> s + n.toString() + s; + Function1 g = f.bind2("|"); + + assertEquals("|128|", g.apply(128)); + } } \ No newline at end of file From c11ad519cae44b686fe068a473c14bbfba8354cd Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 18:46:01 +0300 Subject: [PATCH 18/42] Move testExtensionality into its own class. --- .../veselov/hw05/Function2Test.java | 30 ++++++++++--------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java index 19d7473..3912e43 100644 --- a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java @@ -44,36 +44,38 @@ public void testCompose2() throws Exception { } } - private void testExtensionality(Function1 f1, Function1 f2) { - final int limit = 100; - for (int i = -limit; i <= limit; i++) { - assertTrue(f1.apply(i).equals(f2.apply(i))); - } - } - @Test public void testBind1() throws Exception { - testExtensionality(linearXY.bind1(3), y -> 3 + y); - testExtensionality(cubicXXY.bind1(3), y -> 3 * 3 * y); + TestExtensionality.test(linearXY.bind1(3), y -> 3 + y); + TestExtensionality.test(cubicXXY.bind1(3), y -> 3 * 3 * y); } @Test public void testBind2() throws Exception { - testExtensionality(linearXY.bind2(9), x -> x + 9); - testExtensionality(cubicXXY.bind2(3), x -> x * x * 3); + TestExtensionality.test(linearXY.bind2(9), x -> x + 9); + TestExtensionality.test(cubicXXY.bind2(3), x -> x * x * 3); } @Test public void testCurry() throws Exception { - testExtensionality(linearXY.curry().apply(-5), y -> -5 + y); - testExtensionality(cubicXXY.curry().apply(-5), y -> -5 * (-5) * y); + TestExtensionality.test(linearXY.curry().apply(-5), y -> -5 + y); + TestExtensionality.test(cubicXXY.curry().apply(-5), y -> -5 * (-5) * y); } @Test public void testTypes() throws Exception { Function2 f = (n, s) -> s + n.toString() + s; Function1 g = f.bind2("|"); - + assertEquals("|128|", g.apply(128)); } +} + +class TestExtensionality { + public static void test(Function1 f1, Function1 f2) { + final int limit = 100; + for (int i = -limit; i <= limit; i++) { + assertTrue(f1.apply(i).equals(f2.apply(i))); + } + } } \ No newline at end of file From cfe01445e776c3cf43dcb5f65fdd1ac3daab5cc6 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 18:55:12 +0300 Subject: [PATCH 19/42] Replace static fields for constant predicates with memeber functions. --- .../bachelor2015/veselov/hw05/Predicate.java | 24 +++++++++++-------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index 0b516e3..ab9dae8 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -6,16 +6,6 @@ * @param Type of predicate argument. */ public interface Predicate extends Function1 { - /** - * A predicate which is always true. - */ - Predicate ALWAYS_TRUE = argument -> true; - - /** - * A predicate which is always false. - */ - Predicate ALWAYS_FALSE = argument -> false; - /** * Returns new predicate which is disjunction of current and given one. * @@ -44,4 +34,18 @@ default Predicate and(Predicate default Predicate not() { return argument -> !Predicate.this.apply(argument); } + + /** + * @return A predicate which is always true. + */ + default Predicate alwaysTrue() { + return argument -> true; + } + + /** + * @return A predicate which is always false. + */ + default Predicate alwaysFalse() { + return argument -> false; + } } From a288911146f8b4fe93d893e6dc64ea28c7747b69 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 18:57:50 +0300 Subject: [PATCH 20/42] Add tests for predicate. --- .../veselov/hw05/PredicateTest.java | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java new file mode 100644 index 0000000..991df1b --- /dev/null +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java @@ -0,0 +1,58 @@ +package ru.spbau.bachelor2015.veselov.hw05; + +import org.junit.Before; +import org.junit.Test; + +public class PredicateTest { + Predicate even; + Predicate positive; + Predicate prime; + + private static boolean isPrime(int n) { + n = Math.abs(n); + if (n == 0 || n == 1) { + return false; + } + + for (int i = 2; i < n; i++) { + if (n % i == 0) { + return false; + } + } + + return true; + } + + @Before + public void setUp() throws Exception { + even = n -> n % 2 == 0; + positive = n -> n > 0; + + prime = n -> isPrime(n); + } + + @Test + public void testOr() throws Exception { + TestExtensionality.test(even.or(prime), n -> n % 2 == 0 || isPrime(n)); + } + + @Test + public void testAnd() throws Exception { + TestExtensionality.test(positive.and(prime), n -> n > 0 && isPrime(n)); + } + + @Test + public void testNot() throws Exception { + TestExtensionality.test(even.not(), n -> n % 2 != 0); + } + + @Test + public void testAlwaysTrue() throws Exception { + TestExtensionality.test(even.alwaysTrue(), n -> true); + } + + @Test + public void testAlwaysFalse() throws Exception { + TestExtensionality.test(even.alwaysFalse(), n -> false); + } +} \ No newline at end of file From 1a606b581e6a41622e66744e355dc38f69742208 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 19:05:29 +0300 Subject: [PATCH 21/42] Add annotations. --- 05-FP/.idea/modules/05-FP_main.iml | 9 +++++++++ .../spbau/bachelor2015/veselov/hw05/Function1.java | 4 +++- .../spbau/bachelor2015/veselov/hw05/Function2.java | 11 +++++++---- .../spbau/bachelor2015/veselov/hw05/Predicate.java | 12 +++++++----- 4 files changed, 26 insertions(+), 10 deletions(-) diff --git a/05-FP/.idea/modules/05-FP_main.iml b/05-FP/.idea/modules/05-FP_main.iml index 8f27a19..8202b0a 100644 --- a/05-FP/.idea/modules/05-FP_main.iml +++ b/05-FP/.idea/modules/05-FP_main.iml @@ -9,5 +9,14 @@ + + + + + + + + + \ No newline at end of file diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java index 9aca0a7..d698f35 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java @@ -1,5 +1,7 @@ package ru.spbau.bachelor2015.veselov.hw05; +import org.jetbrains.annotations.NotNull; + /** * Class that represents function which can be applied to one argument. * @@ -22,7 +24,7 @@ public interface Function1 { * @param Type of returning value of method argument. * @return The resulting composition. */ - default Function1 compose(Function1 function) { + default @NotNull Function1 compose(@NotNull Function1 function) { return argument -> function.apply(Function1.this.apply(argument)); } } diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index 8c32376..0dde58b 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -1,5 +1,7 @@ package ru.spbau.bachelor2015.veselov.hw05; +import org.jetbrains.annotations.NotNull; + /** * Class that represents function of two arguments which can be applied to them. * @@ -24,7 +26,8 @@ public interface Function2 { * @param Type of returning value of method argument. * @return The resulting composition. */ - default Function2 compose(Function1 function) { + default @NotNull Function2 compose( + @NotNull Function1 function) { return (argument1, argument2) -> function.apply(Function2.this.apply(argument1, argument2)); } @@ -34,7 +37,7 @@ default Function2 compose(Function1 bind1(Source1 argument1) { + default @NotNull Function1 bind1(Source1 argument1) { return argument2 -> Function2.this.apply(argument1, argument2); } @@ -44,7 +47,7 @@ default Function1 bind1(Source1 argument1) { * @param argument2 A value to which second argument will be bound. * @return The resulting function of one argument. */ - default Function1 bind2(Source2 argument2) { + default @NotNull Function1 bind2(Source2 argument2) { return argument1 -> Function2.this.apply(argument1, argument2); } @@ -53,7 +56,7 @@ default Function1 bind2(Source2 argument2) { * * @return Function of one argument which returns function. */ - default Function1> curry() { + default @NotNull Function1> curry() { return argument -> Function2.this.bind1(argument); } } diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index ab9dae8..00a504f 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -1,5 +1,7 @@ package ru.spbau.bachelor2015.veselov.hw05; +import org.jetbrains.annotations.NotNull; + /** * A function of one argument which either accepts it (returns true) or rejects it (returns false). * @@ -13,7 +15,7 @@ public interface Predicate extends Function1 { * @param Type of second predicate argument. * @return Disjunction of predicates. */ - default Predicate or(Predicate predicate) { + default @NotNull Predicate or(@NotNull Predicate predicate) { return argument -> Predicate.this.apply(argument) || predicate.apply(argument); } @@ -24,28 +26,28 @@ default Predicate or(Predicate * @param Type of second predicate argument. * @return Conjunction of predicates. */ - default Predicate and(Predicate predicate) { + default @NotNull Predicate and(@NotNull Predicate predicate) { return argument -> Predicate.this.apply(argument) && predicate.apply(argument); } /** * @return A predicate which is the opposite of current one. */ - default Predicate not() { + default @NotNull Predicate not() { return argument -> !Predicate.this.apply(argument); } /** * @return A predicate which is always true. */ - default Predicate alwaysTrue() { + default @NotNull Predicate alwaysTrue() { return argument -> true; } /** * @return A predicate which is always false. */ - default Predicate alwaysFalse() { + default @NotNull Predicate alwaysFalse() { return argument -> false; } } From 2620d1f3f89eb7d6a3f7c172a8ada6b3cc59a872 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 21:07:35 +0300 Subject: [PATCH 22/42] Add skeleton of Collection class. --- .../veselov/hw05/Collections.java | 31 +++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java new file mode 100644 index 0000000..182840b --- /dev/null +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -0,0 +1,31 @@ +package ru.spbau.bachelor2015.veselov.hw05; + +public class Collections { + public static void map() { + throw new UnsupportedOperationException(); + } + + public static void filter() { + throw new UnsupportedOperationException(); + } + + public static void takeWhile() { + throw new UnsupportedOperationException(); + } + + public static void takeUnless() { + throw new UnsupportedOperationException(); + } + + public static void foldr() { + throw new UnsupportedOperationException(); + } + + public static void foldl() { + throw new UnsupportedOperationException(); + } + + private Collections() { + throw new UnsupportedOperationException(); + } +} From 0d0d5210376c0d3f1c6b92b96c048711be58e43e Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 21:18:59 +0300 Subject: [PATCH 23/42] Add implementation for map method of Collections class. --- .../veselov/hw05/Collections.java | 41 ++++++++++++++++++- 1 file changed, 39 insertions(+), 2 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 182840b..7872f97 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -1,8 +1,45 @@ package ru.spbau.bachelor2015.veselov.hw05; +import org.jetbrains.annotations.NotNull; + +import java.util.Iterator; + +/** + * Class which provides functions which use Collections and Functional classes together. + */ public class Collections { - public static void map() { - throw new UnsupportedOperationException(); + /** + * Applies given function to all elements of iterable object and returns iterable object of results of application. + * + * @param function A function which is applied to elements. + * @param iterable An iterable object which represents a list of elements. + * @param Type of function argument. + * @param Type of function returning value. + * @param Type of elements in iterable object. + * @return Iterable object which consists of results of application. + */ + public static Iterable map( + @NotNull Function1 function, @NotNull Iterable iterable) { + return new Iterable() { + @Override + public Iterator iterator() { + return new IteratorWrapper(); + } + + class IteratorWrapper implements Iterator { + private Iterator iterator = iterable.iterator(); + + @Override + public boolean hasNext() { + return iterator.hasNext(); + } + + @Override + public Target next() { + return function.apply(iterator.next()); + } + } + }; } public static void filter() { From aa66840348f4967949673bbe7fad348c9abe956a Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 21:21:01 +0300 Subject: [PATCH 24/42] Make constant predicate methods static. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java | 4 ++-- .../ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java index 00a504f..fb7c747 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Predicate.java @@ -40,14 +40,14 @@ public interface Predicate extends Function1 { /** * @return A predicate which is always true. */ - default @NotNull Predicate alwaysTrue() { + static @NotNull Predicate alwaysTrue() { return argument -> true; } /** * @return A predicate which is always false. */ - default @NotNull Predicate alwaysFalse() { + static @NotNull Predicate alwaysFalse() { return argument -> false; } } diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java index 991df1b..da5918d 100644 --- a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java @@ -48,11 +48,11 @@ public void testNot() throws Exception { @Test public void testAlwaysTrue() throws Exception { - TestExtensionality.test(even.alwaysTrue(), n -> true); + TestExtensionality.test(Predicate.alwaysTrue(), n -> true); } @Test public void testAlwaysFalse() throws Exception { - TestExtensionality.test(even.alwaysFalse(), n -> false); + TestExtensionality.test(Predicate.alwaysFalse(), n -> false); } } \ No newline at end of file From 85f4fe192d21efa22cab75cfb6d179ac3f4beb56 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 21:26:04 +0300 Subject: [PATCH 25/42] Add missed annotation. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Collections.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 7872f97..d85df7e 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -18,7 +18,7 @@ public class Collections { * @param Type of elements in iterable object. * @return Iterable object which consists of results of application. */ - public static Iterable map( + public static @NotNull Iterable map( @NotNull Function1 function, @NotNull Iterable iterable) { return new Iterable() { @Override From f2bee13b5175265e2e5720d6068f2c822218c458 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 21:41:09 +0300 Subject: [PATCH 26/42] Add signatures for all unimplemented methods of Collections class. --- .../veselov/hw05/Collections.java | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index d85df7e..8690e53 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -42,23 +42,32 @@ public Target next() { }; } - public static void filter() { + public static @NotNull Iterable filter(@NotNull Predicate predicate, + @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } - public static void takeWhile() { + public static @NotNull Iterable takeWhile(@NotNull Predicate predicate, + @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } - public static void takeUnless() { + public static @NotNull Iterable takeUnless(@NotNull Predicate predicate, + @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } - public static void foldr() { + public static @NotNull Target foldr( + @NotNull Function2 function, + Source1 initialValue, + @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } - public static void foldl() { + public static @NotNull Target foldl( + @NotNull Function2 function, + Source1 initialValue, + @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } From 5ba3630ec3bb52ba9b17094aa8abc1c34b6f5915 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 22:37:35 +0300 Subject: [PATCH 27/42] Add javadocs to all methods of Collections class. --- .../veselov/hw05/Collections.java | 61 ++++++++++++++++++- 1 file changed, 59 insertions(+), 2 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 8690e53..f346c1a 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -42,29 +42,86 @@ public Target next() { }; } + /** + * Filters elements of iterable object by using a given predicate. + * + * @param predicate A predicate to filter elements. + * @param iterable A list of elements. + * @param Type of predicate argument. + * @param Type of elements in a list. + * @return New list of elements which were accepted by predicate. + */ public static @NotNull Iterable filter(@NotNull Predicate predicate, @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } + /** + * Returns some elements from the beginning of a given list of elements up to an element which was rejected by a + * given predicate. Rejected element will not be included in resulting list. + * + * @param predicate A predicate which determines terminal element. + * @param iterable A list of elements. + * @param Type of predicate argument. + * @param Type of elements in a list. + * @return New list which is a prefix of a given one. + */ public static @NotNull Iterable takeWhile(@NotNull Predicate predicate, @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } + /** + * Returns some elements from the beginning of a given list of elements up to an element which was accepted by a + * given predicate. Accepted element will not be included in resulting list. + * + * @param predicate A predicate which determines terminal element. + * @param iterable A list of elements. + * @param Type of predicate argument. + * @param Type of elements in a list. + * @return New list which is a prefix of a given one. + */ public static @NotNull Iterable takeUnless(@NotNull Predicate predicate, @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } - public static @NotNull Target foldr( + /** + * Folds given list of elements into one value which is computed by a given function of two arguments. Method + * sequentially (from the beginning of the list) applies this function to the elements of the list and accumulates + * result. The function should accept accumulated result and next element. + * + * @param function A function of two arguments which folds a list of elements. + * @param initialValue Initially accumulated result. + * @param iterable A list of elements. + * @param Type of first argument of a function. + * @param Type of second argument of a function. + * @param Type of returning value of a function. + * @param Type of elements in a list. + * @return One value - the result of folding. + */ + public static @NotNull Target foldl( @NotNull Function2 function, Source1 initialValue, @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } - public static @NotNull Target foldl( + /** + * Folds given list of elements into one value which is computed by a given function of two arguments. Method + * sequentially (from the end of the list) applies this function to the elements of the list and accumulates + * result. The function should accept accumulated result and next element. + * + * @param function A function of two arguments which folds a list of elements. + * @param initialValue Initially accumulated result. + * @param iterable A list of elements. + * @param Type of first argument of a function. + * @param Type of second argument of a function. + * @param Type of returning value of a function. + * @param Type of elements in a list. + * @return One value - the result of folding. + */ + public static @NotNull Target foldr( @NotNull Function2 function, Source1 initialValue, @NotNull Iterable iterable) { From 8a306108bf218996a6105cbef49769ef8c8c840e Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 22:45:59 +0300 Subject: [PATCH 28/42] Make Collection class final. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Collections.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index f346c1a..1ecfb83 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -7,7 +7,7 @@ /** * Class which provides functions which use Collections and Functional classes together. */ -public class Collections { +public final class Collections { /** * Applies given function to all elements of iterable object and returns iterable object of results of application. * From 475116f6365df13064a680dbaa345e846f482947 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 22:49:21 +0300 Subject: [PATCH 29/42] Specify javadocs. --- .../ru/spbau/bachelor2015/veselov/hw05/Collections.java | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 1ecfb83..5a3bb05 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -16,7 +16,7 @@ public final class Collections { * @param Type of function argument. * @param Type of function returning value. * @param Type of elements in iterable object. - * @return Iterable object which consists of results of application. + * @return Non modifiable Iterable object which consists of results of application. */ public static @NotNull Iterable map( @NotNull Function1 function, @NotNull Iterable iterable) { @@ -49,7 +49,7 @@ public Target next() { * @param iterable A list of elements. * @param Type of predicate argument. * @param Type of elements in a list. - * @return New list of elements which were accepted by predicate. + * @return New non modifiable list of elements which were accepted by predicate. */ public static @NotNull Iterable filter(@NotNull Predicate predicate, @NotNull Iterable iterable) { @@ -64,7 +64,7 @@ public Target next() { * @param iterable A list of elements. * @param Type of predicate argument. * @param Type of elements in a list. - * @return New list which is a prefix of a given one. + * @return New non modifiable list which is a prefix of a given one. */ public static @NotNull Iterable takeWhile(@NotNull Predicate predicate, @NotNull Iterable iterable) { @@ -79,7 +79,7 @@ public Target next() { * @param iterable A list of elements. * @param Type of predicate argument. * @param Type of elements in a list. - * @return New list which is a prefix of a given one. + * @return New non modifiable list which is a prefix of a given one. */ public static @NotNull Iterable takeUnless(@NotNull Predicate predicate, @NotNull Iterable iterable) { From 3f43c3e9def1a8f51b47c2155a6f933a67c3fe93 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:02:09 +0300 Subject: [PATCH 30/42] Add implementation for filter method of Collections class. --- .../veselov/hw05/Collections.java | 41 ++++++++++++++++++- 1 file changed, 40 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 5a3bb05..a86dba0 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -3,6 +3,7 @@ import org.jetbrains.annotations.NotNull; import java.util.Iterator; +import java.util.NoSuchElementException; /** * Class which provides functions which use Collections and Functional classes together. @@ -53,7 +54,45 @@ public Target next() { */ public static @NotNull Iterable filter(@NotNull Predicate predicate, @NotNull Iterable iterable) { - throw new UnsupportedOperationException(); + return new Iterable() { + @Override + public Iterator iterator() { + return new IteratorWrapper(); + } + + class IteratorWrapper implements Iterator { + private Iterator iterator = iterable.iterator(); + private T element = null; + + @Override + public boolean hasNext() { + if (element != null) { + return true; + } + + while (iterator.hasNext()) { + element = iterator.next(); + if (predicate.apply(element)) { + return true; + } + } + + element = null; + return false; + } + + @Override + public T next() { + if (!hasNext()) { + throw new NoSuchElementException(); + } + + T tmp = element; + element = null; + return tmp; + } + } + }; } /** From 18c24243c2ce043081b46bba43fb5f5f9b037c56 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:05:03 +0300 Subject: [PATCH 31/42] Replace anonymous classes with lambdas. --- .../veselov/hw05/Collections.java | 74 ++++++++----------- 1 file changed, 30 insertions(+), 44 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index a86dba0..0510982 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -21,24 +21,17 @@ public final class Collections { */ public static @NotNull Iterable map( @NotNull Function1 function, @NotNull Iterable iterable) { - return new Iterable() { + return () -> new Iterator() { + private Iterator iterator = iterable.iterator(); + @Override - public Iterator iterator() { - return new IteratorWrapper(); + public boolean hasNext() { + return iterator.hasNext(); } - class IteratorWrapper implements Iterator { - private Iterator iterator = iterable.iterator(); - - @Override - public boolean hasNext() { - return iterator.hasNext(); - } - - @Override - public Target next() { - return function.apply(iterator.next()); - } + @Override + public Target next() { + return function.apply(iterator.next()); } }; } @@ -54,43 +47,36 @@ public Target next() { */ public static @NotNull Iterable filter(@NotNull Predicate predicate, @NotNull Iterable iterable) { - return new Iterable() { - @Override - public Iterator iterator() { - return new IteratorWrapper(); - } + return () -> new Iterator() { + private Iterator iterator = iterable.iterator(); + private T element = null; - class IteratorWrapper implements Iterator { - private Iterator iterator = iterable.iterator(); - private T element = null; + @Override + public boolean hasNext() { + if (element != null) { + return true; + } - @Override - public boolean hasNext() { - if (element != null) { + while (iterator.hasNext()) { + element = iterator.next(); + if (predicate.apply(element)) { return true; } - - while (iterator.hasNext()) { - element = iterator.next(); - if (predicate.apply(element)) { - return true; - } - } - - element = null; - return false; } - @Override - public T next() { - if (!hasNext()) { - throw new NoSuchElementException(); - } + element = null; + return false; + } - T tmp = element; - element = null; - return tmp; + @Override + public T next() { + if (!hasNext()) { + throw new NoSuchElementException(); } + + T tmp = element; + element = null; + return tmp; } }; } From b415c2ab6ed4610e44204a76a8bdfe7b98a41aca Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:11:06 +0300 Subject: [PATCH 32/42] Add implementation for takeWhile method of Collections class. --- .../veselov/hw05/Collections.java | 40 ++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 0510982..a0228e3 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -93,7 +93,45 @@ public T next() { */ public static @NotNull Iterable takeWhile(@NotNull Predicate predicate, @NotNull Iterable iterable) { - throw new UnsupportedOperationException(); + return () -> new Iterator() { + Iterator iterator = iterable.iterator(); + T element = null; + boolean terminated = false; + + @Override + public boolean hasNext() { + if (terminated) { + return false; + } + + if (element != null) { + return true; + } + + if (!iterator.hasNext()) { + return false; + } + + element = iterator.next(); + if (predicate.apply(element)) { + return true; + } + + terminated = true; + return false; + } + + @Override + public T next() { + if (!hasNext()) { + throw new NoSuchElementException(); + } + + T tmp = element; + element = null; + return tmp; + } + }; } /** From 28f1d84a2a013f93a8da194dec0ebff47056850a Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:11:48 +0300 Subject: [PATCH 33/42] Add implementation for takeUnless method of Collections class. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Collections.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index a0228e3..8a1e561 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -146,7 +146,7 @@ public T next() { */ public static @NotNull Iterable takeUnless(@NotNull Predicate predicate, @NotNull Iterable iterable) { - throw new UnsupportedOperationException(); + return takeWhile(predicate.not(), iterable); } /** From 51b9a123ffdbe58b6cf1b7632eb98cc0f420946c Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:21:18 +0300 Subject: [PATCH 34/42] Add implementation for foldl method of Collections class. --- .../ru/spbau/bachelor2015/veselov/hw05/Collections.java | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 8a1e561..57b496d 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -165,9 +165,14 @@ public T next() { */ public static @NotNull Target foldl( @NotNull Function2 function, - Source1 initialValue, + Target initialValue, @NotNull Iterable iterable) { - throw new UnsupportedOperationException(); + Target accumulatedValue = initialValue; + for (T element : iterable) { + accumulatedValue = function.apply(accumulatedValue, element); + } + + return accumulatedValue; } /** From df368ea2c09a4b7ee5b22eb3260e0e510ff22861 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:22:08 +0300 Subject: [PATCH 35/42] Fix signature of foldr method. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Collections.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 57b496d..9eeb01e 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -191,7 +191,7 @@ public T next() { */ public static @NotNull Target foldr( @NotNull Function2 function, - Source1 initialValue, + Target initialValue, @NotNull Iterable iterable) { throw new UnsupportedOperationException(); } From 79cd7c187e358ccab0b0689eb1f50daabced8a84 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:24:24 +0300 Subject: [PATCH 36/42] Correct javadocs. --- .../main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java | 2 +- .../main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java index d698f35..c659c31 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function1.java @@ -3,7 +3,7 @@ import org.jetbrains.annotations.NotNull; /** - * Class that represents function which can be applied to one argument. + * Interface that represents function which can be applied to one argument. * * @param Type of function argument. * @param Type of returning value. diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index 0dde58b..f9f02f0 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -3,7 +3,7 @@ import org.jetbrains.annotations.NotNull; /** - * Class that represents function of two arguments which can be applied to them. + * Interface that represents function of two arguments which can be applied to them. * * @param Type of function first argument. * @param Type of function second argument. From cae34c6cb19b64f34defbc8e1b437f4f1bc8ba88 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:29:37 +0300 Subject: [PATCH 37/42] Replace lambda with method reference. --- .../main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java index f9f02f0..5c25eb5 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Function2.java @@ -57,6 +57,6 @@ public interface Function2 { * @return Function of one argument which returns function. */ default @NotNull Function1> curry() { - return argument -> Function2.this.bind1(argument); + return Function2.this::bind1; } } From 353bcbc018cc8ca685717765cc4e8580fc6410f4 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:41:34 +0300 Subject: [PATCH 38/42] Add implementation for foldr method of Collections class. --- .../bachelor2015/veselov/hw05/Collections.java | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index 9eeb01e..e675830 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -2,7 +2,9 @@ import org.jetbrains.annotations.NotNull; +import java.util.ArrayList; import java.util.Iterator; +import java.util.List; import java.util.NoSuchElementException; /** @@ -193,10 +195,20 @@ public T next() { @NotNull Function2 function, Target initialValue, @NotNull Iterable iterable) { - throw new UnsupportedOperationException(); + return foldl(function, initialValue, reversed(iterable)); } private Collections() { throw new UnsupportedOperationException(); } + + private static @NotNull Iterable reversed(@NotNull Iterable iterable) { + List list = new ArrayList(); + for (T element : iterable) { + list.add(element); + } + + java.util.Collections.reverse(list); + return list; + } } From d7e8bc267a45102b1c0a19fcb0461b5b1e962d84 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:47:13 +0300 Subject: [PATCH 39/42] Add skeleton of Collections testing class. --- .../veselov/hw05/CollectionsTest.java | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/CollectionsTest.java diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/CollectionsTest.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/CollectionsTest.java new file mode 100644 index 0000000..c04a6b7 --- /dev/null +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/CollectionsTest.java @@ -0,0 +1,41 @@ +package ru.spbau.bachelor2015.veselov.hw05; + +import org.junit.Before; +import org.junit.Test; + +public class CollectionsTest { + @Before + public void setUp() throws Exception { + + } + + @Test + public void testMap() throws Exception { + + } + + @Test + public void testFilter() throws Exception { + + } + + @Test + public void testTakeWhile() throws Exception { + + } + + @Test + public void testTakeUnless() throws Exception { + + } + + @Test + public void testFoldl() throws Exception { + + } + + @Test + public void testFoldr() throws Exception { + + } +} \ No newline at end of file From 5366a8db490944f37c5a3570fae10be05ed61fbc Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sat, 15 Oct 2016 23:51:20 +0300 Subject: [PATCH 40/42] Apply IDEA tips for testing classes. --- .../bachelor2015/veselov/hw05/Function1Test.java | 10 +++++----- .../bachelor2015/veselov/hw05/Function2Test.java | 8 ++++---- .../bachelor2015/veselov/hw05/PredicateTest.java | 12 ++++++------ 3 files changed, 15 insertions(+), 15 deletions(-) diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java index b592879..6365ee4 100644 --- a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function1Test.java @@ -6,10 +6,10 @@ import static org.junit.Assert.assertEquals; public class Function1Test { - Function1 id; - Function1 linear2; - Function1 linear3Shift5; - Function1 quadratic; + private Function1 id; + private Function1 linear2; + private Function1 linear3Shift5; + private Function1 quadratic; @Before public void setUp() throws Exception { @@ -45,7 +45,7 @@ public void testCompose3() throws Exception { @Test public void testTypes() throws Exception { - Function1 f = n -> n.toString(); + Function1 f = Object::toString; Function1 g = s -> "[" + s + "]"; Function1 h = f.compose(g); diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java index 3912e43..f7dccfb 100644 --- a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/Function2Test.java @@ -7,11 +7,11 @@ import static org.junit.Assert.assertTrue; public class Function2Test { - Function1 linear2; - Function1 quadratic; + private Function1 linear2; + private Function1 quadratic; - Function2 linearXY; - Function2 cubicXXY; + private Function2 linearXY; + private Function2 cubicXXY; @Before public void setUp() throws Exception { diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java index da5918d..e61b79b 100644 --- a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/PredicateTest.java @@ -4,9 +4,9 @@ import org.junit.Test; public class PredicateTest { - Predicate even; - Predicate positive; - Predicate prime; + private Predicate even; + private Predicate positive; + private Predicate prime; private static boolean isPrime(int n) { n = Math.abs(n); @@ -28,7 +28,7 @@ public void setUp() throws Exception { even = n -> n % 2 == 0; positive = n -> n > 0; - prime = n -> isPrime(n); + prime = PredicateTest::isPrime; } @Test @@ -48,11 +48,11 @@ public void testNot() throws Exception { @Test public void testAlwaysTrue() throws Exception { - TestExtensionality.test(Predicate.alwaysTrue(), n -> true); + TestExtensionality.test(Predicate.alwaysTrue(), n -> true); } @Test public void testAlwaysFalse() throws Exception { - TestExtensionality.test(Predicate.alwaysFalse(), n -> false); + TestExtensionality.test(Predicate.alwaysFalse(), n -> false); } } \ No newline at end of file From 7b4a0256e92f9d7c7d06028eed86c7bba7283add Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sun, 16 Oct 2016 00:37:50 +0300 Subject: [PATCH 41/42] Add tests for Collections class. --- .../veselov/hw05/CollectionsTest.java | 48 +++++++++++++++++-- 1 file changed, 43 insertions(+), 5 deletions(-) diff --git a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/CollectionsTest.java b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/CollectionsTest.java index c04a6b7..099ea68 100644 --- a/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/CollectionsTest.java +++ b/05-FP/src/test/java/ru/spbau/bachelor2015/veselov/hw05/CollectionsTest.java @@ -3,39 +3,77 @@ import org.junit.Before; import org.junit.Test; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Iterator; +import java.util.List; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertFalse; +import static org.junit.Assert.assertTrue; + public class CollectionsTest { + private List naturalsUpTo100 = new ArrayList<>(); + private List naturalsUpTo100Str = new ArrayList<>(); + private List evensUpTo100 = new ArrayList<>(); + private List naturalsUpTo50 = new ArrayList<>(); + private List someWords = Arrays.asList("Just", "a", "visual", "artifact"); + @Before public void setUp() throws Exception { + for (int i = 0; i <= 100; i++) { + naturalsUpTo100.add(i); + naturalsUpTo100Str.add(Integer.toString(i)); + if (i % 2 == 0) { + evensUpTo100.add(i); + } + + if (i <= 50) { + naturalsUpTo50.add(i); + } + } } @Test public void testMap() throws Exception { - + compareIterable(Collections.map(Object::toString, naturalsUpTo100), naturalsUpTo100Str); } @Test public void testFilter() throws Exception { - + compareIterable(Collections.filter(n -> n % 2 == 0, naturalsUpTo100), evensUpTo100); } @Test public void testTakeWhile() throws Exception { - + compareIterable(Collections.takeWhile(n -> n <= 50, naturalsUpTo100), naturalsUpTo50); } @Test public void testTakeUnless() throws Exception { - + compareIterable(Collections.takeUnless(n -> n > 50, naturalsUpTo100), naturalsUpTo50); } @Test public void testFoldl() throws Exception { - + assertEquals("Java", Collections.foldl((a, s) -> a + Character.toString(s.charAt(0)), "", someWords)); } @Test public void testFoldr() throws Exception { + assertEquals("DjavaJ", Collections.foldr((a, s) -> a + Character.toString(s.charAt(0)), "Dj", someWords)); + } + + private void compareIterable(Iterable iterable1, Iterable iterable2) throws Exception { + Iterator it1 = iterable1.iterator(); + Iterator it2 = iterable2.iterator(); + + while (it1.hasNext()) { + assertTrue(it2.hasNext()); + assertTrue(it1.next().equals(it2.next())); + } + assertFalse(it2.hasNext()); } } \ No newline at end of file From 34e73b35f649e6ac5ed7a5a0773eb3cc839f7943 Mon Sep 17 00:00:00 2001 From: Ivan Veselov Date: Sun, 16 Oct 2016 00:39:47 +0300 Subject: [PATCH 42/42] Apply IDEA tips. --- .../java/ru/spbau/bachelor2015/veselov/hw05/Collections.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java index e675830..f89cddc 100644 --- a/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java +++ b/05-FP/src/main/java/ru/spbau/bachelor2015/veselov/hw05/Collections.java @@ -203,7 +203,7 @@ private Collections() { } private static @NotNull Iterable reversed(@NotNull Iterable iterable) { - List list = new ArrayList(); + List list = new ArrayList<>(); for (T element : iterable) { list.add(element); }