Add generateBuilders option

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

@@ -52,6 +52,7 @@
 import java.nio.file.Path;
 import java.time.ZonedDateTime;
 import java.util.*;
+import java.util.stream.Collectors;
 
 import static org.openapitools.codegen.utils.OnceLogger.once;
 

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

@@ -38,6 +38,7 @@ public class JavaJAXRSSpecServerCodegen extends AbstractJavaJAXRSServerCodegen {
     public static final String USE_SWAGGER_ANNOTATIONS = "useSwaggerAnnotations";
     public static final String JACKSON = "jackson";
     public static final String OPEN_API_SPEC_FILE_LOCATION = "openApiSpecFileLocation";
+    public static final String GENERATE_BUILDERS = "generateBuilders";
 
     public static final String QUARKUS_LIBRARY = "quarkus";
     public static final String THORNTAIL_LIBRARY = "thorntail";
@@ -47,6 +48,7 @@ public class JavaJAXRSSpecServerCodegen extends AbstractJavaJAXRSServerCodegen {
     private boolean interfaceOnly = false;
     private boolean returnResponse = false;
     private boolean generatePom = true;
+    private boolean generateBuilders = true;
     private boolean useSwaggerAnnotations = true;
     private boolean useJackson = false;
     private String openApiSpecFileLocation = "src/main/openapi/openapi.yaml";
@@ -103,6 +105,7 @@ public JavaJAXRSSpecServerCodegen() {
 
         cliOptions.add(library);
         cliOptions.add(CliOption.newBoolean(GENERATE_POM, "Whether to generate pom.xml if the file does not already exist.").defaultValue(String.valueOf(generatePom)));
+        cliOptions.add(CliOption.newBoolean(GENERATE_BUILDERS, "Whether to generate builders for models.").defaultValue(String.valueOf(generateBuilders)));
         cliOptions.add(CliOption.newBoolean(INTERFACE_ONLY, "Whether to generate only API interface stubs without the server files.").defaultValue(String.valueOf(interfaceOnly)));
         cliOptions.add(CliOption.newBoolean(RETURN_RESPONSE, "Whether generate API interface should return javax.ws.rs.core.Response instead of a deserialized entity. Only useful if interfaceOnly is true.").defaultValue(String.valueOf(returnResponse)));
         cliOptions.add(CliOption.newBoolean(USE_SWAGGER_ANNOTATIONS, "Whether to generate Swagger annotations.", useSwaggerAnnotations));
@@ -126,14 +129,20 @@ public void processOpts() {
                 additionalProperties.remove(RETURN_RESPONSE);
             }
         }
-        if(QUARKUS_LIBRARY.equals(library) || THORNTAIL_LIBRARY.equals(library) || HELIDON_LIBRARY.equals(library) || OPEN_LIBERTY_LIBRARY.equals(library)) {
+        if (QUARKUS_LIBRARY.equals(library) || THORNTAIL_LIBRARY.equals(library) || HELIDON_LIBRARY.equals(library) || OPEN_LIBERTY_LIBRARY.equals(library)) {
             useSwaggerAnnotations = false;
         } else {
             if (additionalProperties.containsKey(USE_SWAGGER_ANNOTATIONS)) {
                 useSwaggerAnnotations = Boolean.valueOf(additionalProperties.get(USE_SWAGGER_ANNOTATIONS).toString());
             }
         }
         writePropertyBack(USE_SWAGGER_ANNOTATIONS, useSwaggerAnnotations);
+
+        if (additionalProperties.containsKey(GENERATE_BUILDERS)) {
+            generateBuilders = Boolean.valueOf(additionalProperties.get(GENERATE_BUILDERS).toString());
+        }
+        additionalProperties.put(GENERATE_BUILDERS, generateBuilders);
+
         if (additionalProperties.containsKey(OPEN_API_SPEC_FILE_LOCATION)) {
             openApiSpecFileLocation = additionalProperties.get(OPEN_API_SPEC_FILE_LOCATION).toString();
         } else if(QUARKUS_LIBRARY.equals(library) || THORNTAIL_LIBRARY.equals(library) || HELIDON_LIBRARY.equals(library)) {

modules/openapi-generator/src/main/resources/JavaJaxRS/spec/pojo.mustache

@@ -32,6 +32,12 @@ public class {{classname}} {{#parent}}extends {{{parent}}}{{/parent}} {{#seriali
     return this;
   }
 
+  {{#generateBuilders}}public {{classname}}({{#vars}}{{{datatypeWithEnum}}} {{name}}{{#hasMore}}, {{/hasMore}}{{/vars}}) {
+  {{#vars}}
+      this.{{name}} = {{name}};
+  {{/vars}}
+  }{{/generateBuilders}}
+
   {{#vendorExtensions.x-extra-annotation}}{{{vendorExtensions.x-extra-annotation}}}{{/vendorExtensions.x-extra-annotation}}{{#useSwaggerAnnotations}}
   @ApiModelProperty({{#example}}example = "{{{example}}}", {{/example}}{{#required}}required = {{required}}, {{/required}}value = "{{{description}}}"){{/useSwaggerAnnotations}}
   @JsonProperty("{{baseName}}")
@@ -83,4 +89,37 @@ public class {{classname}} {{#parent}}extends {{{parent}}}{{/parent}} {{#seriali
     }
     return o.toString().replace("\n", "\n    ");
   }
+
+  {{#generateBuilders}}
+  public static Builder builder() {
+    return new Builder();
+  }
+
+  public static class Builder {
+    {{#vars}}
+    private {{{datatypeWithEnum}}} {{name}}{{#defaultValue}} = {{{.}}}{{/defaultValue}};
+    {{/vars}}
+
+    {{#vars}}
+    /**
+      {{#description}}
+      * {{description}}
+      {{/description}}
+      {{#minimum}}
+      * minimum: {{minimum}}
+      {{/minimum}}
+      {{#maximum}}
+      * maximum: {{maximum}}
+      {{/maximum}}
+      **/
+    public Builder {{name}}({{{datatypeWithEnum}}} {{name}}) {
+      this.{{name}} = {{name}};
+      return this;
+    }
+    {{/vars}}
+
+    public {{classname}} build() {
+      return new {{classname}}({{#vars}}{{name}}{{#hasMore}}, {{/hasMore}}{{/vars}});
+    }
+  }{{/generateBuilders}}
 }