Dart - update generator to support null safety

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenModel.java

@@ -64,7 +64,7 @@ public class CodegenModel implements IJsonSchemaValidationProperties {
     public String defaultValue;
     public String arrayModelType;
     public boolean isAlias; // Is this effectively an alias of another simple type
-    public boolean isString, isInteger, isLong, isNumber, isNumeric, isFloat, isDouble, isDate, isDateTime, isShort, isUnboundedInteger, isBoolean;
+    public boolean isString, isInteger, isLong, isNumber, isNumeric, isFloat, isDouble, isDate, isDateTime, isShort, isUnboundedInteger, isPrimitiveType, isBoolean;
     private boolean additionalPropertiesIsAnyType;
     public List<CodegenProperty> vars = new ArrayList<>(); // all properties (without parent's properties)
     public List<CodegenProperty> allVars = new ArrayList<>(); // all properties (with parent's properties)
@@ -637,6 +637,14 @@ public void setIsUnboundedInteger(boolean isUnboundedInteger)   {
         this.isUnboundedInteger = isUnboundedInteger;
     }
 
+    @Override
+    public boolean getIsPrimitiveType() { return isPrimitiveType; }
+
+    @Override
+    public void setIsPrimitiveType(boolean isPrimitiveType)  {
+        this.isPrimitiveType = isPrimitiveType;
+    }
+
     @Override
     public CodegenProperty getAdditionalProperties() { return additionalProperties; }
 

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenParameter.java

@@ -623,6 +623,14 @@ public void setIsUnboundedInteger(boolean isUnboundedInteger)  {
         this.isUnboundedInteger = isUnboundedInteger;
     }
 
+    @Override
+    public boolean getIsPrimitiveType() { return isPrimitiveType; }
+
+    @Override
+    public void setIsPrimitiveType(boolean isPrimitiveType)  {
+        this.isPrimitiveType = isPrimitiveType;
+    }
+
     @Override
     public CodegenProperty getAdditionalProperties() { return additionalProperties; }
 

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenProperty.java

@@ -536,6 +536,14 @@ public void setIsUnboundedInteger(boolean isUnboundedInteger)  {
         this.isUnboundedInteger = isUnboundedInteger;
     }
 
+    @Override
+    public boolean getIsPrimitiveType() { return isPrimitiveType; }
+
+    @Override
+    public void setIsPrimitiveType(boolean isPrimitiveType)  {
+        this.isPrimitiveType = isPrimitiveType;
+    }
+
     public Map<String, Object> getVendorExtensions() {
         return vendorExtensions;
     }

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenResponse.java

@@ -371,6 +371,14 @@ public void setIsUnboundedInteger(boolean isUnboundedInteger)  {
         this.isUnboundedInteger = isUnboundedInteger;
     }
 
+    @Override
+    public boolean getIsPrimitiveType() { return primitiveType; }
+
+    @Override
+    public void setIsPrimitiveType(boolean isPrimitiveType)  {
+        this.primitiveType = isPrimitiveType;
+    }
+
     @Override
     public void setIsModel(boolean isModel)  {
         this.isModel = isModel;

modules/openapi-generator/src/main/java/org/openapitools/codegen/IJsonSchemaValidationProperties.java

@@ -95,6 +95,10 @@ public interface IJsonSchemaValidationProperties {
 
     void setIsUnboundedInteger(boolean isUnboundedInteger);
 
+    boolean getIsPrimitiveType();
+
+    void setIsPrimitiveType(boolean isPrimitiveType);
+
     CodegenProperty getAdditionalProperties();
 
     void setAdditionalProperties(CodegenProperty additionalProperties);
@@ -213,4 +217,4 @@ default void setTypeProperties(Schema p) {
             setIsAnyType(true);
         }
     }
-}
+}

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractDartCodegen.java

@@ -1,5 +1,7 @@
 package org.openapitools.codegen.languages;
 
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
 import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.media.ArraySchema;
 import io.swagger.v3.oas.models.media.Schema;
@@ -112,12 +114,13 @@ public AbstractDartCodegen() {
         setReservedWordsLowerCase(reservedWordsList);
 
         // These types return isPrimitive=true in templates
-        languageSpecificPrimitives = new HashSet<>(5);
-        languageSpecificPrimitives.add("String");
-        languageSpecificPrimitives.add("bool");
-        languageSpecificPrimitives.add("int");
-        languageSpecificPrimitives.add("num");
-        languageSpecificPrimitives.add("double");
+        languageSpecificPrimitives = Sets.newHashSet(
+                "String",
+                "bool",
+                "int",
+                "num",
+                "double"
+        );
 
         typeMapping = new HashMap<>();
         typeMapping.put("Array", "List");
@@ -148,17 +151,18 @@ public AbstractDartCodegen() {
         typeMapping.put("AnyType", "Object");
 
         // Data types of the above values which are automatically imported
-        defaultIncludes = new HashSet<>();
-        defaultIncludes.add("String");
-        defaultIncludes.add("bool");
-        defaultIncludes.add("int");
-        defaultIncludes.add("num");
-        defaultIncludes.add("double");
-        defaultIncludes.add("List");
-        defaultIncludes.add("Set");
-        defaultIncludes.add("Map");
-        defaultIncludes.add("DateTime");
-        defaultIncludes.add("Object");
+        defaultIncludes = Sets.newHashSet(
+                "String",
+                "bool",
+                "int",
+                "num",
+                "double",
+                "List",
+                "Set",
+                "Map",
+                "DateTime",
+                "Object"
+        );
 
         imports.put("String", "dart:core");
         imports.put("bool", "dart:core");

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java

@@ -36,6 +36,7 @@ public class DartClientCodegen extends AbstractDartCodegen {
 
     public DartClientCodegen() {
         super();
+
         final CliOption serializationLibrary = CliOption.newString(CodegenConstants.SERIALIZATION_LIBRARY,
                 "Specify serialization library");
         serializationLibrary.setDefault(SERIALIZATION_LIBRARY_NATIVE);

modules/openapi-generator/src/main/resources/dart2/README.mustache

@@ -19,7 +19,7 @@ For more information, please visit [{{{infoUrl}}}]({{{infoUrl}}})
 
 ## Requirements
 
-Dart 2.0 or later
+Dart 2.12 or later
 
 ## Installation & Usage
 

modules/openapi-generator/src/main/resources/dart2/api.mustache

@@ -3,7 +3,7 @@
 {{#operations}}
 
 class {{{classname}}} {
-  {{{classname}}}([ApiClient apiClient]) : apiClient = apiClient ?? defaultApiClient;
+  {{{classname}}}([ApiClient? apiClient]) : apiClient = apiClient ?? defaultApiClient;
 
   final ApiClient apiClient;
   {{#operation}}
@@ -49,24 +49,13 @@ class {{{classname}}} {
   ///
     {{/-last}}
   {{/allParams}}
-  Future<Response> {{{nickname}}}WithHttpInfo({{#allParams}}{{#required}}{{{dataType}}} {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}}{{#hasOptionalParams}}{ {{#allParams}}{{^required}}{{{dataType}}} {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}} }{{/hasOptionalParams}}) async {
-  {{#hasParams}}
-    // Verify required params are set.
-    {{#allParams}}
-      {{#required}}
-    if ({{{paramName}}} == null) {
-     throw ApiException(HttpStatus.badRequest, 'Missing required param: {{{paramName}}}');
-    }
-      {{/required}}
-    {{/allParams}}
-
-  {{/hasParams}}
+  Future<Response> {{{nickname}}}WithHttpInfo({{#allParams}}{{#required}}{{{dataType}}} {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}}{{#hasOptionalParams}}{ {{#allParams}}{{^required}}{{{dataType}}}? {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}} }{{/hasOptionalParams}}) async {
     // ignore: prefer_const_declarations
     final path = r'{{{path}}}'{{#pathParams}}
       .replaceAll({{=<% %>=}}'{<% baseName %>}'<%={{ }}=%>, {{{paramName}}}{{^isString}}.toString(){{/isString}}){{/pathParams}};
 
     // ignore: prefer_final_locals
-    Object postBody{{#bodyParam}} = {{{paramName}}}{{/bodyParam}};
+    Object? postBody{{#bodyParam}} = {{{paramName}}}{{/bodyParam}};
 
     final queryParams = <QueryParam>[];
     final headerParams = <String, String>{};
@@ -77,7 +66,7 @@ class {{{classname}}} {
         {{^required}}
     if ({{{paramName}}} != null) {
           {{/required}}
-      queryParams.addAll(_convertParametersForCollectionFormat('{{{collectionFormat}}}', '{{{baseName}}}', {{{paramName}}}));
+      queryParams.addAll(_queryParams('{{{collectionFormat}}}', '{{{baseName}}}', {{{paramName}}}));
           {{^required}}
     }
         {{/required}}
@@ -139,7 +128,7 @@ class {{{classname}}} {
       postBody,
       headerParams,
       formParams,
-      contentTypes.isEmpty ? null : contentTypes[0],
+      contentTypes.isEmpty ? null : contentTypes.first,
       authNames,
     );
   }
@@ -174,7 +163,7 @@ class {{{classname}}} {
   ///
     {{/-last}}
   {{/allParams}}
-  Future<{{{returnType}}}{{^returnType}}void{{/returnType}}> {{{nickname}}}({{#allParams}}{{#required}}{{{dataType}}} {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}}{{#hasOptionalParams}}{ {{#allParams}}{{^required}}{{{dataType}}} {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}} }{{/hasOptionalParams}}) async {
+  Future<{{#returnType}}{{{.}}}?{{/returnType}}{{^returnType}}void{{/returnType}}> {{{nickname}}}({{#allParams}}{{#required}}{{{dataType}}} {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}}{{#hasOptionalParams}}{ {{#allParams}}{{^required}}{{{dataType}}}? {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}} }{{/hasOptionalParams}}) async {
     final response = await {{{nickname}}}WithHttpInfo({{#allParams}}{{#required}}{{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}}{{#hasOptionalParams}} {{#allParams}}{{^required}}{{{paramName}}}: {{{paramName}}},{{^-last}} {{/-last}}{{/required}}{{/allParams}} {{/hasOptionalParams}});
     if (response.statusCode >= HttpStatus.badRequest) {
       throw ApiException(response.statusCode, await _decodeBodyBytes(response));
@@ -183,13 +172,13 @@ class {{{classname}}} {
     // When a remote server returns no body with a status of 204, we shall not decode it.
     // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
     // FormatException when trying to decode an empty string.
-    if (response.body != null && response.statusCode != HttpStatus.noContent) {
+    if (response.body.isNotEmpty && response.statusCode != HttpStatus.noContent) {
     {{#native_serialization}}
     {{#isArray}}
       final responseBody = await _decodeBodyBytes(response);
       return (await apiClient.deserializeAsync(responseBody, '{{{returnType}}}') as List)
         .cast<{{{returnBaseType}}}>()
-        .{{#uniqueItems}}toSet(){{/uniqueItems}}{{^uniqueItems}}toList(growable: false){{/uniqueItems}};
+        .{{#uniqueItems}}toSet(){{/uniqueItems}}{{^uniqueItems}}toList(){{/uniqueItems}};
     {{/isArray}}
     {{^isArray}}
     {{#isMap}}
@@ -199,7 +188,7 @@ class {{{classname}}} {
       return await apiClient.deserializeAsync(await _decodeBodyBytes(response), '{{{returnType}}}',) as {{{returnType}}};
     {{/isMap}}{{/isArray}}{{/native_serialization}}
     }
-    return Future<{{{returnType}}}>.value();
+    return null;
     {{/returnType}}
   }
   {{/operation}}