From cc69ae9dde1f59e7a78e997cacbeb0a397cb6734 Mon Sep 17 00:00:00 2001
From: Dmitry <qudeed@gmail.com>
Date: Mon, 16 Oct 2017 14:26:47 +0300
Subject: [PATCH 1/4] init commit

---
 .gitignore                                    |  49 +++++++++++
 .idea/compiler.xml                            |  16 ++++
 .idea/misc.xml                                |  13 +++
 .idea/modules.xml                             |   8 ++
 Maybe.iml                                     |  17 ++++
 pom.xml                                       |  36 ++++++++
 .../java/ru/spbau/mit/kazakov/Maybe/Main.java |  63 +++++++++++++
 .../ru/spbau/mit/kazakov/Maybe/Maybe.java     |  83 ++++++++++++++++++
 .../kazakov/Maybe/getNothingException.java    |   7 ++
 .../ru/spbau/mit/kazakov/Maybe/MainTest.java  |  47 ++++++++++
 .../ru/spbau/mit/kazakov/Maybe/MaybeTest.java |  60 +++++++++++++
 .../ru/spbau/mit/kazakov/Maybe/Main.class     | Bin 0 -> 3978 bytes
 .../ru/spbau/mit/kazakov/Maybe/Maybe.class    | Bin 0 -> 2100 bytes
 .../kazakov/Maybe/getNothingException.class   | Bin 0 -> 339 bytes
 .../compile/default-compile/createdFiles.lst  |   3 +
 .../compile/default-compile/inputFiles.lst    |   3 +
 .../default-testCompile/createdFiles.lst      |   2 +
 .../default-testCompile/inputFiles.lst        |   2 +
 ...ST-ru.spbau.mit.kazakov.Maybe.MainTest.xml |  64 ++++++++++++++
 ...T-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml |  70 +++++++++++++++
 .../ru.spbau.mit.kazakov.Maybe.MainTest.txt   |   4 +
 .../ru.spbau.mit.kazakov.Maybe.MaybeTest.txt  |   4 +
 .../ru/spbau/mit/kazakov/Maybe/MainTest.class | Bin 0 -> 2225 bytes
 .../spbau/mit/kazakov/Maybe/MaybeTest.class   | Bin 0 -> 3912 bytes
 24 files changed, 551 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .idea/compiler.xml
 create mode 100644 .idea/misc.xml
 create mode 100644 .idea/modules.xml
 create mode 100644 Maybe.iml
 create mode 100644 pom.xml
 create mode 100644 src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java
 create mode 100644 src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
 create mode 100644 src/main/java/ru/spbau/mit/kazakov/Maybe/getNothingException.java
 create mode 100644 src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java
 create mode 100644 src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java
 create mode 100644 target/classes/ru/spbau/mit/kazakov/Maybe/Main.class
 create mode 100644 target/classes/ru/spbau/mit/kazakov/Maybe/Maybe.class
 create mode 100644 target/classes/ru/spbau/mit/kazakov/Maybe/getNothingException.class
 create mode 100644 target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst
 create mode 100644 target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst
 create mode 100644 target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/createdFiles.lst
 create mode 100644 target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst
 create mode 100644 target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MainTest.xml
 create mode 100644 target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml
 create mode 100644 target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MainTest.txt
 create mode 100644 target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MaybeTest.txt
 create mode 100644 target/test-classes/ru/spbau/mit/kazakov/Maybe/MainTest.class
 create mode 100644 target/test-classes/ru/spbau/mit/kazakov/Maybe/MaybeTest.class

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..345e61a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,49 @@
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/dictionaries
+
+# Sensitive or high-churn files:
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# CMake
+cmake-build-debug/
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000..067d5ff
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="Maybe" />
+      </profile>
+    </annotationProcessing>
+    <bytecodeTargetLevel>
+      <module name="Maybe" target="1.8" />
+    </bytecodeTargetLevel>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..e8942bd
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..65c89bb
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/Maybe.iml" filepath="$PROJECT_DIR$/Maybe.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/Maybe.iml b/Maybe.iml
new file mode 100644
index 0000000..57f498f
--- /dev/null
+++ b/Maybe.iml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Maven: junit:junit:4.8" level="project" />
+    <orderEntry type="library" name="Maven: org.jetbrains:annotations:13.0" level="project" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000..fe36c91
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>ru.spbau.mit.kazakov.Maybe</groupId>
+    <artifactId>Maybe</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains</groupId>
+            <artifactId>annotations</artifactId>
+            <version>13.0</version>
+        </dependency>
+    </dependencies>
+
+</project>
\ No newline at end of file
diff --git a/src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java b/src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java
new file mode 100644
index 0000000..8bd1447
--- /dev/null
+++ b/src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java
@@ -0,0 +1,63 @@
+package ru.spbau.mit.kazakov.Maybe;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.*;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+/**
+ * Reads numbers from input file and writes squared values to output file. If read data isn't a number writes "null" instead.
+ */
+public class Main {
+    /**
+     * Primary method.
+     *
+     * @param args the first argument is input file and the second one is output file
+     */
+    public static void main(@NotNull String[] args) throws IOException, getNothingException {
+        ArrayList<Maybe<Integer>> readData = new ArrayList<>();
+        try (Scanner scanner = new Scanner(new File(args[0]))) {
+            while (scanner.hasNextLine()) {
+                Integer value = tryParse(scanner.nextLine());
+                if (value == null) {
+                    readData.add(Maybe.nothing());
+                } else {
+                    readData.add(Maybe.just(value));
+                }
+            }
+        }
+
+        ArrayList<Maybe<Integer>> squaredNumber = new ArrayList<>();
+        for (Maybe<Integer> maybeInt : readData) {
+            squaredNumber.add(maybeInt.map(value -> value * value));
+        }
+
+        try (BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(args[1]))) {
+            for (Maybe<Integer> maybeInt : squaredNumber) {
+                if (maybeInt.isPresent()) {
+                    bufferedWriter.write(maybeInt.get().toString());
+                } else {
+                    bufferedWriter.write("null");
+                }
+                bufferedWriter.newLine();
+            }
+        }
+    }
+
+    /**
+     * Parses specified String to Integer.
+     *
+     * @return Integer if String was a number, and null otherwise
+     */
+    @Nullable
+    private static Integer tryParse(@NotNull String parsingString) {
+        try {
+            return Integer.parseInt(parsingString);
+        } catch (NumberFormatException e) {
+            return null;
+        }
+    }
+
+}
diff --git a/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java b/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
new file mode 100644
index 0000000..b0216f4
--- /dev/null
+++ b/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
@@ -0,0 +1,83 @@
+package ru.spbau.mit.kazakov.Maybe;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.function.Function;
+
+/**
+ * Generic container for storing a value or nothing.
+ */
+public class Maybe<T> {
+    @Nullable
+    private final T value;
+
+    /**
+     * Assigns specified value to class's storing field.
+     *
+     * @param t specified value
+     */
+    private Maybe(T t) {
+        value = t;
+    }
+
+    /**
+     * Creates an object for storing specified value.
+     *
+     * @param t specified value
+     * @return new object
+     */
+    @NotNull
+    public static <T> Maybe<T> just(T t) {
+        return new Maybe<T>(t);
+    }
+
+    /**
+     * Creates an object for strong nothing.
+     *
+     * @return new object
+     */
+    @NotNull
+    public static <T> Maybe<T> nothing() {
+        return new Maybe<T>(null);
+    }
+
+    /**
+     * Returns stored value or throws exception if there is no value.
+     *
+     * @return stored value
+     * @throws getNothingException if there is no stored value
+     */
+    @NotNull
+    public T get() throws getNothingException {
+        if (isPresent()) {
+            return value;
+        } else {
+            throw new getNothingException();
+        }
+    }
+
+    /**
+     * Checks if there is stored value.
+     *
+     * @return true if there is stored value, and false otherwise
+     */
+    public boolean isPresent() {
+        return value != null;
+    }
+
+    /**
+     * Maps stored value of type T to another value of type U.
+     *
+     * @param mapper a function acting from T to V
+     * @param <U>    image's type
+     * @return Maybe object storing mapped value if there is a storing value, and Maybe object storing nothing otherwise
+     */
+    @NotNull
+    public <U> Maybe<U> map(@NotNull Function<? super T, ? extends U> mapper) {
+        if (!isPresent()) {
+            return nothing();
+        }
+        return just(mapper.apply(value));
+    }
+}
diff --git a/src/main/java/ru/spbau/mit/kazakov/Maybe/getNothingException.java b/src/main/java/ru/spbau/mit/kazakov/Maybe/getNothingException.java
new file mode 100644
index 0000000..7789bf9
--- /dev/null
+++ b/src/main/java/ru/spbau/mit/kazakov/Maybe/getNothingException.java
@@ -0,0 +1,7 @@
+package ru.spbau.mit.kazakov.Maybe;
+
+/**
+ * Exception thrown when there is no value to return.
+ */
+public class getNothingException extends Exception {
+}
diff --git a/src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java b/src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java
new file mode 100644
index 0000000..90c6fe1
--- /dev/null
+++ b/src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java
@@ -0,0 +1,47 @@
+package ru.spbau.mit.kazakov.Maybe;
+
+import org.junit.Test;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Scanner;
+
+import org.junit.Rule;
+import org.junit.rules.TemporaryFolder;
+
+import static org.junit.Assert.*;
+
+public class MainTest {
+    @Rule
+    public TemporaryFolder testFolder = new TemporaryFolder();
+
+    @Test
+    public void testMain() throws IOException, getNothingException {
+        File input = testFolder.newFile("input.txt");
+        File output = testFolder.newFile("output.txt");
+
+        try (BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(input))) {
+            bufferedWriter.write("1\n0\n-3\nj\njava\n1b\n11 22\n");
+        }
+
+        Main.main(new String[]{input.getAbsolutePath(), output.getAbsolutePath()});
+
+
+        assertEquals("1\n0\n9\nnull\nnull\nnull\nnull\n", new String(Files.readAllBytes(Paths.get(output.getAbsolutePath()))));
+    }
+
+    @Test
+    public void testMainEmpty() throws IOException, getNothingException {
+        File input = testFolder.newFile("input.txt");
+        File output = testFolder.newFile("output.txt");
+
+        Main.main(new String[]{input.getAbsolutePath(), output.getAbsolutePath()});
+
+        assertEquals("", new String(Files.readAllBytes(Paths.get(output.getAbsolutePath()))));
+    }
+
+}
\ No newline at end of file
diff --git a/src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java b/src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java
new file mode 100644
index 0000000..54b7846
--- /dev/null
+++ b/src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java
@@ -0,0 +1,60 @@
+package ru.spbau.mit.kazakov.Maybe;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class MaybeTest {
+    @Test
+    public void testJustInteger() throws getNothingException {
+        Maybe<Integer> maybeInteger = Maybe.just(5);
+        int storedValue = maybeInteger.get();
+        assertEquals(5, storedValue);
+    }
+
+    @Test
+    public void testNothingBoolean() {
+        Maybe<Boolean> maybeBoolean = Maybe.nothing();
+        assertFalse(maybeBoolean.isPresent());
+    }
+
+    @Test
+    public void testGetDouble() throws getNothingException {
+        Maybe<Double> maybeDouble = Maybe.just(-7.0);
+        double storedValue = maybeDouble.get();
+        assertEquals(-7.0, storedValue, 0.000000001);
+    }
+
+    @Test(expected = getNothingException.class)
+    public void testGetCharacterThrowsException() throws getNothingException {
+        Maybe<Character> maybeCharacter = Maybe.nothing();
+        char storedValue = maybeCharacter.get();
+    }
+
+    @Test
+    public void testIsPresentFalse() {
+        Maybe<Byte> maybeBoolean = Maybe.nothing();
+        assertFalse(maybeBoolean.isPresent());
+    }
+
+    @Test
+    public void testIsPresentTrue() {
+        Maybe<String> maybeString = Maybe.just("abacaba");
+        assertTrue(maybeString.isPresent());
+    }
+
+    @Test
+    public void testMapJust() throws getNothingException {
+        Maybe<Integer> maybeInteger = Maybe.just(10);
+        Maybe<Integer> mappedMaybeInteger = maybeInteger.map(value -> value * value);
+        int mappedValue = mappedMaybeInteger.get();
+        assertEquals(100, mappedValue);
+    }
+
+    @Test
+    public void testMapNothing() throws getNothingException {
+        Maybe<Integer> maybeInteger = Maybe.nothing();
+        Maybe<Integer> mappedMaybeInteger = maybeInteger.map(value -> value * value);
+        assertFalse(mappedMaybeInteger.isPresent());
+    }
+}
\ No newline at end of file
diff --git a/target/classes/ru/spbau/mit/kazakov/Maybe/Main.class b/target/classes/ru/spbau/mit/kazakov/Maybe/Main.class
new file mode 100644
index 0000000000000000000000000000000000000000..6bafd51dadac3eb34fc19d52644fad85854c4d65
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diff --git a/target/classes/ru/spbau/mit/kazakov/Maybe/getNothingException.class b/target/classes/ru/spbau/mit/kazakov/Maybe/getNothingException.class
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diff --git a/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst b/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst
new file mode 100644
index 0000000..2d6fa0a
--- /dev/null
+++ b/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst
@@ -0,0 +1,3 @@
+ru/spbau/mit/kazakov/Maybe/Maybe.class
+ru/spbau/mit/kazakov/Maybe/Main.class
+ru/spbau/mit/kazakov/Maybe/getNothingException.class
diff --git a/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst b/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst
new file mode 100644
index 0000000..2c04c69
--- /dev/null
+++ b/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst
@@ -0,0 +1,3 @@
+/home/dmitry/IdeaProjects/Maybe/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
+/home/dmitry/IdeaProjects/Maybe/src/main/java/ru/spbau/mit/kazakov/Maybe/getNothingException.java
+/home/dmitry/IdeaProjects/Maybe/src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java
diff --git a/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/createdFiles.lst b/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/createdFiles.lst
new file mode 100644
index 0000000..873951f
--- /dev/null
+++ b/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/createdFiles.lst
@@ -0,0 +1,2 @@
+ru/spbau/mit/kazakov/Maybe/MaybeTest.class
+ru/spbau/mit/kazakov/Maybe/MainTest.class
diff --git a/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst b/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst
new file mode 100644
index 0000000..bab8d68
--- /dev/null
+++ b/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst
@@ -0,0 +1,2 @@
+/home/dmitry/IdeaProjects/Maybe/src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java
+/home/dmitry/IdeaProjects/Maybe/src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java
diff --git a/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MainTest.xml b/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MainTest.xml
new file mode 100644
index 0000000..8d8fa30
--- /dev/null
+++ b/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MainTest.xml
@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuite name="ru.spbau.mit.kazakov.Maybe.MainTest" time="0.056" tests="2" errors="0" skipped="0" failures="0">
+  <properties>
+    <property name="java.runtime.name" value="Java(TM) SE Runtime Environment"/>
+    <property name="sun.boot.library.path" value="/usr/lib/jvm/java-8-oracle/jre/lib/amd64"/>
+    <property name="java.vm.version" value="25.144-b01"/>
+    <property name="java.vm.vendor" value="Oracle Corporation"/>
+    <property name="maven.multiModuleProjectDirectory" value="/home/dmitry/IdeaProjects/Maybe"/>
+    <property name="java.vendor.url" value="http://java.oracle.com/"/>
+    <property name="path.separator" value=":"/>
+    <property name="guice.disable.misplaced.annotation.check" value="true"/>
+    <property name="java.vm.name" value="Java HotSpot(TM) 64-Bit Server VM"/>
+    <property name="file.encoding.pkg" value="sun.io"/>
+    <property name="user.country" value="US"/>
+    <property name="sun.java.launcher" value="SUN_STANDARD"/>
+    <property name="sun.os.patch.level" value="unknown"/>
+    <property name="java.vm.specification.name" value="Java Virtual Machine Specification"/>
+    <property name="user.dir" value="/home/dmitry/IdeaProjects/Maybe"/>
+    <property name="java.runtime.version" value="1.8.0_144-b01"/>
+    <property name="java.awt.graphicsenv" value="sun.awt.X11GraphicsEnvironment"/>
+    <property name="java.endorsed.dirs" value="/usr/lib/jvm/java-8-oracle/jre/lib/endorsed"/>
+    <property name="os.arch" value="amd64"/>
+    <property name="java.io.tmpdir" value="/tmp"/>
+    <property name="line.separator" value="&#10;"/>
+    <property name="java.vm.specification.vendor" value="Oracle Corporation"/>
+    <property name="os.name" value="Linux"/>
+    <property name="classworlds.conf" value="/usr/share/maven/bin/m2.conf"/>
+    <property name="sun.jnu.encoding" value="UTF-8"/>
+    <property name="java.library.path" value="/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib"/>
+    <property name="java.specification.name" value="Java Platform API Specification"/>
+    <property name="java.class.version" value="52.0"/>
+    <property name="sun.management.compiler" value="HotSpot 64-Bit Tiered Compilers"/>
+    <property name="os.version" value="4.9.0-3-amd64"/>
+    <property name="user.home" value="/home/dmitry"/>
+    <property name="user.timezone" value="Europe/Moscow"/>
+    <property name="java.awt.printerjob" value="sun.print.PSPrinterJob"/>
+    <property name="file.encoding" value="UTF-8"/>
+    <property name="java.specification.version" value="1.8"/>
+    <property name="user.name" value="dmitry"/>
+    <property name="java.class.path" value="/usr/share/maven/boot/plexus-classworlds-2.x.jar"/>
+    <property name="java.vm.specification.version" value="1.8"/>
+    <property name="sun.arch.data.model" value="64"/>
+    <property name="java.home" value="/usr/lib/jvm/java-8-oracle/jre"/>
+    <property name="sun.java.command" value="org.codehaus.plexus.classworlds.launcher.Launcher test"/>
+    <property name="java.specification.vendor" value="Oracle Corporation"/>
+    <property name="user.language" value="en"/>
+    <property name="awt.toolkit" value="sun.awt.X11.XToolkit"/>
+    <property name="java.vm.info" value="mixed mode"/>
+    <property name="java.version" value="1.8.0_144"/>
+    <property name="java.ext.dirs" value="/usr/lib/jvm/java-8-oracle/jre/lib/ext:/usr/java/packages/lib/ext"/>
+    <property name="securerandom.source" value="file:/dev/./urandom"/>
+    <property name="sun.boot.class.path" value="/usr/lib/jvm/java-8-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jce.jar:/usr/lib/jvm/java-8-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jfr.jar:/usr/lib/jvm/java-8-oracle/jre/classes"/>
+    <property name="java.vendor" value="Oracle Corporation"/>
+    <property name="maven.home" value="/usr/share/maven"/>
+    <property name="file.separator" value="/"/>
+    <property name="java.vendor.url.bug" value="http://bugreport.sun.com/bugreport/"/>
+    <property name="sun.cpu.endian" value="little"/>
+    <property name="sun.io.unicode.encoding" value="UnicodeLittle"/>
+    <property name="sun.desktop" value="gnome"/>
+    <property name="sun.cpu.isalist" value=""/>
+  </properties>
+  <testcase name="testMain" classname="ru.spbau.mit.kazakov.Maybe.MainTest" time="0.055"/>
+  <testcase name="testMainEmpty" classname="ru.spbau.mit.kazakov.Maybe.MainTest" time="0.001"/>
+</testsuite>
\ No newline at end of file
diff --git a/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml b/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml
new file mode 100644
index 0000000..8af6efe
--- /dev/null
+++ b/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml
@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuite name="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0.061" tests="8" errors="0" skipped="0" failures="0">
+  <properties>
+    <property name="java.runtime.name" value="Java(TM) SE Runtime Environment"/>
+    <property name="sun.boot.library.path" value="/usr/lib/jvm/java-8-oracle/jre/lib/amd64"/>
+    <property name="java.vm.version" value="25.144-b01"/>
+    <property name="java.vm.vendor" value="Oracle Corporation"/>
+    <property name="maven.multiModuleProjectDirectory" value="/home/dmitry/IdeaProjects/Maybe"/>
+    <property name="java.vendor.url" value="http://java.oracle.com/"/>
+    <property name="path.separator" value=":"/>
+    <property name="guice.disable.misplaced.annotation.check" value="true"/>
+    <property name="java.vm.name" value="Java HotSpot(TM) 64-Bit Server VM"/>
+    <property name="file.encoding.pkg" value="sun.io"/>
+    <property name="user.country" value="US"/>
+    <property name="sun.java.launcher" value="SUN_STANDARD"/>
+    <property name="sun.os.patch.level" value="unknown"/>
+    <property name="java.vm.specification.name" value="Java Virtual Machine Specification"/>
+    <property name="user.dir" value="/home/dmitry/IdeaProjects/Maybe"/>
+    <property name="java.runtime.version" value="1.8.0_144-b01"/>
+    <property name="java.awt.graphicsenv" value="sun.awt.X11GraphicsEnvironment"/>
+    <property name="java.endorsed.dirs" value="/usr/lib/jvm/java-8-oracle/jre/lib/endorsed"/>
+    <property name="os.arch" value="amd64"/>
+    <property name="java.io.tmpdir" value="/tmp"/>
+    <property name="line.separator" value="&#10;"/>
+    <property name="java.vm.specification.vendor" value="Oracle Corporation"/>
+    <property name="os.name" value="Linux"/>
+    <property name="classworlds.conf" value="/usr/share/maven/bin/m2.conf"/>
+    <property name="sun.jnu.encoding" value="UTF-8"/>
+    <property name="java.library.path" value="/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib"/>
+    <property name="java.specification.name" value="Java Platform API Specification"/>
+    <property name="java.class.version" value="52.0"/>
+    <property name="sun.management.compiler" value="HotSpot 64-Bit Tiered Compilers"/>
+    <property name="os.version" value="4.9.0-3-amd64"/>
+    <property name="user.home" value="/home/dmitry"/>
+    <property name="user.timezone" value="Europe/Moscow"/>
+    <property name="java.awt.printerjob" value="sun.print.PSPrinterJob"/>
+    <property name="file.encoding" value="UTF-8"/>
+    <property name="java.specification.version" value="1.8"/>
+    <property name="user.name" value="dmitry"/>
+    <property name="java.class.path" value="/usr/share/maven/boot/plexus-classworlds-2.x.jar"/>
+    <property name="java.vm.specification.version" value="1.8"/>
+    <property name="sun.arch.data.model" value="64"/>
+    <property name="java.home" value="/usr/lib/jvm/java-8-oracle/jre"/>
+    <property name="sun.java.command" value="org.codehaus.plexus.classworlds.launcher.Launcher test"/>
+    <property name="java.specification.vendor" value="Oracle Corporation"/>
+    <property name="user.language" value="en"/>
+    <property name="awt.toolkit" value="sun.awt.X11.XToolkit"/>
+    <property name="java.vm.info" value="mixed mode"/>
+    <property name="java.version" value="1.8.0_144"/>
+    <property name="java.ext.dirs" value="/usr/lib/jvm/java-8-oracle/jre/lib/ext:/usr/java/packages/lib/ext"/>
+    <property name="securerandom.source" value="file:/dev/./urandom"/>
+    <property name="sun.boot.class.path" value="/usr/lib/jvm/java-8-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jce.jar:/usr/lib/jvm/java-8-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jfr.jar:/usr/lib/jvm/java-8-oracle/jre/classes"/>
+    <property name="java.vendor" value="Oracle Corporation"/>
+    <property name="maven.home" value="/usr/share/maven"/>
+    <property name="file.separator" value="/"/>
+    <property name="java.vendor.url.bug" value="http://bugreport.sun.com/bugreport/"/>
+    <property name="sun.cpu.endian" value="little"/>
+    <property name="sun.io.unicode.encoding" value="UnicodeLittle"/>
+    <property name="sun.desktop" value="gnome"/>
+    <property name="sun.cpu.isalist" value=""/>
+  </properties>
+  <testcase name="testIsPresentFalse" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0.003"/>
+  <testcase name="testIsPresentTrue" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
+  <testcase name="testMapJust" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0.057"/>
+  <testcase name="testMapNothing" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
+  <testcase name="testJustInteger" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0.001"/>
+  <testcase name="testGetCharacterThrowsException" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
+  <testcase name="testNothingBoolean" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
+  <testcase name="testGetDouble" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
+</testsuite>
\ No newline at end of file
diff --git a/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MainTest.txt b/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MainTest.txt
new file mode 100644
index 0000000..adbb610
--- /dev/null
+++ b/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MainTest.txt
@@ -0,0 +1,4 @@
+-------------------------------------------------------------------------------
+Test set: ru.spbau.mit.kazakov.Maybe.MainTest
+-------------------------------------------------------------------------------
+Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.056 sec - in ru.spbau.mit.kazakov.Maybe.MainTest
diff --git a/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MaybeTest.txt b/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MaybeTest.txt
new file mode 100644
index 0000000..15d544e
--- /dev/null
+++ b/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MaybeTest.txt
@@ -0,0 +1,4 @@
+-------------------------------------------------------------------------------
+Test set: ru.spbau.mit.kazakov.Maybe.MaybeTest
+-------------------------------------------------------------------------------
+Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.07 sec - in ru.spbau.mit.kazakov.Maybe.MaybeTest
diff --git a/target/test-classes/ru/spbau/mit/kazakov/Maybe/MainTest.class b/target/test-classes/ru/spbau/mit/kazakov/Maybe/MainTest.class
new file mode 100644
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From 91fb0ec1470c932e53c1a27063b0dc315d46507c Mon Sep 17 00:00:00 2001
From: Dmitry <qudeed@gmail.com>
Date: Mon, 16 Oct 2017 18:11:14 +0300
Subject: [PATCH 2/4] target deleted

---
 .../ru/spbau/mit/kazakov/Maybe/Main.class     | Bin 3978 -> 0 bytes
 .../ru/spbau/mit/kazakov/Maybe/Maybe.class    | Bin 2100 -> 0 bytes
 .../kazakov/Maybe/getNothingException.class   | Bin 339 -> 0 bytes
 .../compile/default-compile/createdFiles.lst  |   3 -
 .../compile/default-compile/inputFiles.lst    |   3 -
 .../default-testCompile/createdFiles.lst      |   2 -
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 ...T-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml |  70 ------------------
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 .../ru.spbau.mit.kazakov.Maybe.MaybeTest.txt  |   4 -
 .../ru/spbau/mit/kazakov/Maybe/MainTest.class | Bin 2225 -> 0 bytes
 .../spbau/mit/kazakov/Maybe/MaybeTest.class   | Bin 3912 -> 0 bytes
 13 files changed, 152 deletions(-)
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 delete mode 100644 target/classes/ru/spbau/mit/kazakov/Maybe/Maybe.class
 delete mode 100644 target/classes/ru/spbau/mit/kazakov/Maybe/getNothingException.class
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 delete mode 100644 target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst
 delete mode 100644 target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MainTest.xml
 delete mode 100644 target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml
 delete mode 100644 target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MainTest.txt
 delete mode 100644 target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MaybeTest.txt
 delete mode 100644 target/test-classes/ru/spbau/mit/kazakov/Maybe/MainTest.class
 delete mode 100644 target/test-classes/ru/spbau/mit/kazakov/Maybe/MaybeTest.class

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index 8d8fa30..0000000
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@@ -1,64 +0,0 @@
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-<testsuite name="ru.spbau.mit.kazakov.Maybe.MainTest" time="0.056" tests="2" errors="0" skipped="0" failures="0">
-  <properties>
-    <property name="java.runtime.name" value="Java(TM) SE Runtime Environment"/>
-    <property name="sun.boot.library.path" value="/usr/lib/jvm/java-8-oracle/jre/lib/amd64"/>
-    <property name="java.vm.version" value="25.144-b01"/>
-    <property name="java.vm.vendor" value="Oracle Corporation"/>
-    <property name="maven.multiModuleProjectDirectory" value="/home/dmitry/IdeaProjects/Maybe"/>
-    <property name="java.vendor.url" value="http://java.oracle.com/"/>
-    <property name="path.separator" value=":"/>
-    <property name="guice.disable.misplaced.annotation.check" value="true"/>
-    <property name="java.vm.name" value="Java HotSpot(TM) 64-Bit Server VM"/>
-    <property name="file.encoding.pkg" value="sun.io"/>
-    <property name="user.country" value="US"/>
-    <property name="sun.java.launcher" value="SUN_STANDARD"/>
-    <property name="sun.os.patch.level" value="unknown"/>
-    <property name="java.vm.specification.name" value="Java Virtual Machine Specification"/>
-    <property name="user.dir" value="/home/dmitry/IdeaProjects/Maybe"/>
-    <property name="java.runtime.version" value="1.8.0_144-b01"/>
-    <property name="java.awt.graphicsenv" value="sun.awt.X11GraphicsEnvironment"/>
-    <property name="java.endorsed.dirs" value="/usr/lib/jvm/java-8-oracle/jre/lib/endorsed"/>
-    <property name="os.arch" value="amd64"/>
-    <property name="java.io.tmpdir" value="/tmp"/>
-    <property name="line.separator" value="&#10;"/>
-    <property name="java.vm.specification.vendor" value="Oracle Corporation"/>
-    <property name="os.name" value="Linux"/>
-    <property name="classworlds.conf" value="/usr/share/maven/bin/m2.conf"/>
-    <property name="sun.jnu.encoding" value="UTF-8"/>
-    <property name="java.library.path" value="/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib"/>
-    <property name="java.specification.name" value="Java Platform API Specification"/>
-    <property name="java.class.version" value="52.0"/>
-    <property name="sun.management.compiler" value="HotSpot 64-Bit Tiered Compilers"/>
-    <property name="os.version" value="4.9.0-3-amd64"/>
-    <property name="user.home" value="/home/dmitry"/>
-    <property name="user.timezone" value="Europe/Moscow"/>
-    <property name="java.awt.printerjob" value="sun.print.PSPrinterJob"/>
-    <property name="file.encoding" value="UTF-8"/>
-    <property name="java.specification.version" value="1.8"/>
-    <property name="user.name" value="dmitry"/>
-    <property name="java.class.path" value="/usr/share/maven/boot/plexus-classworlds-2.x.jar"/>
-    <property name="java.vm.specification.version" value="1.8"/>
-    <property name="sun.arch.data.model" value="64"/>
-    <property name="java.home" value="/usr/lib/jvm/java-8-oracle/jre"/>
-    <property name="sun.java.command" value="org.codehaus.plexus.classworlds.launcher.Launcher test"/>
-    <property name="java.specification.vendor" value="Oracle Corporation"/>
-    <property name="user.language" value="en"/>
-    <property name="awt.toolkit" value="sun.awt.X11.XToolkit"/>
-    <property name="java.vm.info" value="mixed mode"/>
-    <property name="java.version" value="1.8.0_144"/>
-    <property name="java.ext.dirs" value="/usr/lib/jvm/java-8-oracle/jre/lib/ext:/usr/java/packages/lib/ext"/>
-    <property name="securerandom.source" value="file:/dev/./urandom"/>
-    <property name="sun.boot.class.path" value="/usr/lib/jvm/java-8-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jce.jar:/usr/lib/jvm/java-8-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jfr.jar:/usr/lib/jvm/java-8-oracle/jre/classes"/>
-    <property name="java.vendor" value="Oracle Corporation"/>
-    <property name="maven.home" value="/usr/share/maven"/>
-    <property name="file.separator" value="/"/>
-    <property name="java.vendor.url.bug" value="http://bugreport.sun.com/bugreport/"/>
-    <property name="sun.cpu.endian" value="little"/>
-    <property name="sun.io.unicode.encoding" value="UnicodeLittle"/>
-    <property name="sun.desktop" value="gnome"/>
-    <property name="sun.cpu.isalist" value=""/>
-  </properties>
-  <testcase name="testMain" classname="ru.spbau.mit.kazakov.Maybe.MainTest" time="0.055"/>
-  <testcase name="testMainEmpty" classname="ru.spbau.mit.kazakov.Maybe.MainTest" time="0.001"/>
-</testsuite>
\ No newline at end of file
diff --git a/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml b/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml
deleted file mode 100644
index 8af6efe..0000000
--- a/target/surefire-reports/TEST-ru.spbau.mit.kazakov.Maybe.MaybeTest.xml
+++ /dev/null
@@ -1,70 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<testsuite name="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0.061" tests="8" errors="0" skipped="0" failures="0">
-  <properties>
-    <property name="java.runtime.name" value="Java(TM) SE Runtime Environment"/>
-    <property name="sun.boot.library.path" value="/usr/lib/jvm/java-8-oracle/jre/lib/amd64"/>
-    <property name="java.vm.version" value="25.144-b01"/>
-    <property name="java.vm.vendor" value="Oracle Corporation"/>
-    <property name="maven.multiModuleProjectDirectory" value="/home/dmitry/IdeaProjects/Maybe"/>
-    <property name="java.vendor.url" value="http://java.oracle.com/"/>
-    <property name="path.separator" value=":"/>
-    <property name="guice.disable.misplaced.annotation.check" value="true"/>
-    <property name="java.vm.name" value="Java HotSpot(TM) 64-Bit Server VM"/>
-    <property name="file.encoding.pkg" value="sun.io"/>
-    <property name="user.country" value="US"/>
-    <property name="sun.java.launcher" value="SUN_STANDARD"/>
-    <property name="sun.os.patch.level" value="unknown"/>
-    <property name="java.vm.specification.name" value="Java Virtual Machine Specification"/>
-    <property name="user.dir" value="/home/dmitry/IdeaProjects/Maybe"/>
-    <property name="java.runtime.version" value="1.8.0_144-b01"/>
-    <property name="java.awt.graphicsenv" value="sun.awt.X11GraphicsEnvironment"/>
-    <property name="java.endorsed.dirs" value="/usr/lib/jvm/java-8-oracle/jre/lib/endorsed"/>
-    <property name="os.arch" value="amd64"/>
-    <property name="java.io.tmpdir" value="/tmp"/>
-    <property name="line.separator" value="&#10;"/>
-    <property name="java.vm.specification.vendor" value="Oracle Corporation"/>
-    <property name="os.name" value="Linux"/>
-    <property name="classworlds.conf" value="/usr/share/maven/bin/m2.conf"/>
-    <property name="sun.jnu.encoding" value="UTF-8"/>
-    <property name="java.library.path" value="/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib"/>
-    <property name="java.specification.name" value="Java Platform API Specification"/>
-    <property name="java.class.version" value="52.0"/>
-    <property name="sun.management.compiler" value="HotSpot 64-Bit Tiered Compilers"/>
-    <property name="os.version" value="4.9.0-3-amd64"/>
-    <property name="user.home" value="/home/dmitry"/>
-    <property name="user.timezone" value="Europe/Moscow"/>
-    <property name="java.awt.printerjob" value="sun.print.PSPrinterJob"/>
-    <property name="file.encoding" value="UTF-8"/>
-    <property name="java.specification.version" value="1.8"/>
-    <property name="user.name" value="dmitry"/>
-    <property name="java.class.path" value="/usr/share/maven/boot/plexus-classworlds-2.x.jar"/>
-    <property name="java.vm.specification.version" value="1.8"/>
-    <property name="sun.arch.data.model" value="64"/>
-    <property name="java.home" value="/usr/lib/jvm/java-8-oracle/jre"/>
-    <property name="sun.java.command" value="org.codehaus.plexus.classworlds.launcher.Launcher test"/>
-    <property name="java.specification.vendor" value="Oracle Corporation"/>
-    <property name="user.language" value="en"/>
-    <property name="awt.toolkit" value="sun.awt.X11.XToolkit"/>
-    <property name="java.vm.info" value="mixed mode"/>
-    <property name="java.version" value="1.8.0_144"/>
-    <property name="java.ext.dirs" value="/usr/lib/jvm/java-8-oracle/jre/lib/ext:/usr/java/packages/lib/ext"/>
-    <property name="securerandom.source" value="file:/dev/./urandom"/>
-    <property name="sun.boot.class.path" value="/usr/lib/jvm/java-8-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jce.jar:/usr/lib/jvm/java-8-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jfr.jar:/usr/lib/jvm/java-8-oracle/jre/classes"/>
-    <property name="java.vendor" value="Oracle Corporation"/>
-    <property name="maven.home" value="/usr/share/maven"/>
-    <property name="file.separator" value="/"/>
-    <property name="java.vendor.url.bug" value="http://bugreport.sun.com/bugreport/"/>
-    <property name="sun.cpu.endian" value="little"/>
-    <property name="sun.io.unicode.encoding" value="UnicodeLittle"/>
-    <property name="sun.desktop" value="gnome"/>
-    <property name="sun.cpu.isalist" value=""/>
-  </properties>
-  <testcase name="testIsPresentFalse" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0.003"/>
-  <testcase name="testIsPresentTrue" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
-  <testcase name="testMapJust" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0.057"/>
-  <testcase name="testMapNothing" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
-  <testcase name="testJustInteger" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0.001"/>
-  <testcase name="testGetCharacterThrowsException" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
-  <testcase name="testNothingBoolean" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
-  <testcase name="testGetDouble" classname="ru.spbau.mit.kazakov.Maybe.MaybeTest" time="0"/>
-</testsuite>
\ No newline at end of file
diff --git a/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MainTest.txt b/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MainTest.txt
deleted file mode 100644
index adbb610..0000000
--- a/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MainTest.txt
+++ /dev/null
@@ -1,4 +0,0 @@
--------------------------------------------------------------------------------
-Test set: ru.spbau.mit.kazakov.Maybe.MainTest
--------------------------------------------------------------------------------
-Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.056 sec - in ru.spbau.mit.kazakov.Maybe.MainTest
diff --git a/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MaybeTest.txt b/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MaybeTest.txt
deleted file mode 100644
index 15d544e..0000000
--- a/target/surefire-reports/ru.spbau.mit.kazakov.Maybe.MaybeTest.txt
+++ /dev/null
@@ -1,4 +0,0 @@
--------------------------------------------------------------------------------
-Test set: ru.spbau.mit.kazakov.Maybe.MaybeTest
--------------------------------------------------------------------------------
-Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.07 sec - in ru.spbau.mit.kazakov.Maybe.MaybeTest
diff --git a/target/test-classes/ru/spbau/mit/kazakov/Maybe/MainTest.class b/target/test-classes/ru/spbau/mit/kazakov/Maybe/MainTest.class
deleted file mode 100644
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D_sVhV


From 3b1237471fd31ec6d35206b611c92d20805efc85 Mon Sep 17 00:00:00 2001
From: Dmitry <qudeed@gmail.com>
Date: Sat, 25 Nov 2017 22:38:04 +0300
Subject: [PATCH 3/4] Exception class renamed; added static field for nothing()
 in Maybe.

---
 ...ingException.java => GetNothingException.java} |  2 +-
 .../java/ru/spbau/mit/kazakov/Maybe/Main.java     |  2 +-
 .../java/ru/spbau/mit/kazakov/Maybe/Maybe.java    | 15 +++++++++------
 .../java/ru/spbau/mit/kazakov/Maybe/MainTest.java |  5 ++---
 .../ru/spbau/mit/kazakov/Maybe/MaybeTest.java     | 12 ++++++------
 5 files changed, 19 insertions(+), 17 deletions(-)
 rename src/main/java/ru/spbau/mit/kazakov/Maybe/{getNothingException.java => GetNothingException.java} (65%)

diff --git a/src/main/java/ru/spbau/mit/kazakov/Maybe/getNothingException.java b/src/main/java/ru/spbau/mit/kazakov/Maybe/GetNothingException.java
similarity index 65%
rename from src/main/java/ru/spbau/mit/kazakov/Maybe/getNothingException.java
rename to src/main/java/ru/spbau/mit/kazakov/Maybe/GetNothingException.java
index 7789bf9..559714c 100644
--- a/src/main/java/ru/spbau/mit/kazakov/Maybe/getNothingException.java
+++ b/src/main/java/ru/spbau/mit/kazakov/Maybe/GetNothingException.java
@@ -3,5 +3,5 @@
 /**
  * Exception thrown when there is no value to return.
  */
-public class getNothingException extends Exception {
+public class GetNothingException extends Exception {
 }
diff --git a/src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java b/src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java
index 8bd1447..020e039 100644
--- a/src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java
+++ b/src/main/java/ru/spbau/mit/kazakov/Maybe/Main.java
@@ -16,7 +16,7 @@ public class Main {
      *
      * @param args the first argument is input file and the second one is output file
      */
-    public static void main(@NotNull String[] args) throws IOException, getNothingException {
+    public static void main(@NotNull String[] args) throws IOException, GetNothingException {
         ArrayList<Maybe<Integer>> readData = new ArrayList<>();
         try (Scanner scanner = new Scanner(new File(args[0]))) {
             while (scanner.hasNextLine()) {
diff --git a/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java b/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
index b0216f4..14ba734 100644
--- a/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
+++ b/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
@@ -3,12 +3,15 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.Optional;
 import java.util.function.Function;
 
 /**
  * Generic container for storing a value or nothing.
  */
 public class Maybe<T> {
+    private static final Maybe NOTHING = new Maybe<>(null);
+
     @Nullable
     private final T value;
 
@@ -17,7 +20,7 @@ public class Maybe<T> {
      *
      * @param t specified value
      */
-    private Maybe(T t) {
+    private Maybe(@Nullable T t) {
         value = t;
     }
 
@@ -29,7 +32,7 @@ private Maybe(T t) {
      */
     @NotNull
     public static <T> Maybe<T> just(T t) {
-        return new Maybe<T>(t);
+        return new Maybe<>(t);
     }
 
     /**
@@ -39,21 +42,21 @@ public static <T> Maybe<T> just(T t) {
      */
     @NotNull
     public static <T> Maybe<T> nothing() {
-        return new Maybe<T>(null);
+        return NOTHING;
     }
 
     /**
      * Returns stored value or throws exception if there is no value.
      *
      * @return stored value
-     * @throws getNothingException if there is no stored value
+     * @throws GetNothingException if there is no stored value
      */
     @NotNull
-    public T get() throws getNothingException {
+    public T get() throws GetNothingException {
         if (isPresent()) {
             return value;
         } else {
-            throw new getNothingException();
+            throw new GetNothingException();
         }
     }
 
diff --git a/src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java b/src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java
index 90c6fe1..35af725 100644
--- a/src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java
+++ b/src/test/java/ru/spbau/mit/kazakov/Maybe/MainTest.java
@@ -8,7 +8,6 @@
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
-import java.util.Scanner;
 
 import org.junit.Rule;
 import org.junit.rules.TemporaryFolder;
@@ -20,7 +19,7 @@ public class MainTest {
     public TemporaryFolder testFolder = new TemporaryFolder();
 
     @Test
-    public void testMain() throws IOException, getNothingException {
+    public void testMain() throws IOException, GetNothingException {
         File input = testFolder.newFile("input.txt");
         File output = testFolder.newFile("output.txt");
 
@@ -35,7 +34,7 @@ public void testMain() throws IOException, getNothingException {
     }
 
     @Test
-    public void testMainEmpty() throws IOException, getNothingException {
+    public void testMainEmpty() throws IOException, GetNothingException {
         File input = testFolder.newFile("input.txt");
         File output = testFolder.newFile("output.txt");
 
diff --git a/src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java b/src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java
index 54b7846..a73aee0 100644
--- a/src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java
+++ b/src/test/java/ru/spbau/mit/kazakov/Maybe/MaybeTest.java
@@ -6,7 +6,7 @@
 
 public class MaybeTest {
     @Test
-    public void testJustInteger() throws getNothingException {
+    public void testJustInteger() throws GetNothingException {
         Maybe<Integer> maybeInteger = Maybe.just(5);
         int storedValue = maybeInteger.get();
         assertEquals(5, storedValue);
@@ -19,14 +19,14 @@ public void testNothingBoolean() {
     }
 
     @Test
-    public void testGetDouble() throws getNothingException {
+    public void testGetDouble() throws GetNothingException {
         Maybe<Double> maybeDouble = Maybe.just(-7.0);
         double storedValue = maybeDouble.get();
         assertEquals(-7.0, storedValue, 0.000000001);
     }
 
-    @Test(expected = getNothingException.class)
-    public void testGetCharacterThrowsException() throws getNothingException {
+    @Test(expected = GetNothingException.class)
+    public void testGetCharacterThrowsException() throws GetNothingException {
         Maybe<Character> maybeCharacter = Maybe.nothing();
         char storedValue = maybeCharacter.get();
     }
@@ -44,7 +44,7 @@ public void testIsPresentTrue() {
     }
 
     @Test
-    public void testMapJust() throws getNothingException {
+    public void testMapJust() throws GetNothingException {
         Maybe<Integer> maybeInteger = Maybe.just(10);
         Maybe<Integer> mappedMaybeInteger = maybeInteger.map(value -> value * value);
         int mappedValue = mappedMaybeInteger.get();
@@ -52,7 +52,7 @@ public void testMapJust() throws getNothingException {
     }
 
     @Test
-    public void testMapNothing() throws getNothingException {
+    public void testMapNothing() throws GetNothingException {
         Maybe<Integer> maybeInteger = Maybe.nothing();
         Maybe<Integer> mappedMaybeInteger = maybeInteger.map(value -> value * value);
         assertFalse(mappedMaybeInteger.isPresent());

From a7f2aac783fbd248c13533933e5b66e28e865021 Mon Sep 17 00:00:00 2001
From: DmitryAu <qudeed@gmail.com>
Date: Sat, 25 Nov 2017 22:43:28 +0300
Subject: [PATCH 4/4] Deleted unused import.

---
 src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java b/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
index 14ba734..a7ca47c 100644
--- a/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
+++ b/src/main/java/ru/spbau/mit/kazakov/Maybe/Maybe.java
@@ -3,7 +3,6 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.Optional;
 import java.util.function.Function;
 
 /**