add groovy generator, abstract java class (with TODO)

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

@@ -0,0 +1,100 @@
+package org.openapitools.codegen.languages;
+
+import org.openapitools.codegen.*;
+
+import java.io.File;
+
+public class GroovyClientCodegen extends AbstractJavaCodegen {
+    public static final String CONFIG_PACKAGE = "configPackage";
+    protected String title = "Petstore Server";
+    protected String configPackage = "";
+
+    public GroovyClientCodegen() {
+        super();
+
+        // clear import mapping (from default generator) as groovy does not use it
+        // at the moment
+        importMapping.clear();
+
+        sourceFolder = projectFolder + File.separator + "groovy";
+        outputFolder = "generated-code/groovy";
+        modelTemplateFiles.put("model.mustache", ".groovy");
+        apiTemplateFiles.put("api.mustache", ".groovy");
+        apiTestTemplateFiles.clear(); // TODO: add test template
+        embeddedTemplateDir = templateDir = "Groovy";
+
+        // clear model and api doc template as this codegen
+        // does not support auto-generated markdown doc at the moment
+        //TODO: add doc templates
+        modelDocTemplateFiles.remove("model_doc.mustache");
+        apiDocTemplateFiles.remove("api_doc.mustache");
+        
+        apiPackage = "io.swagger.api";
+        modelPackage = "io.swagger.model";
+        configPackage = "io.swagger.configuration";
+        invokerPackage = "io.swagger.api";
+        artifactId = "swagger-groovy";
+        dateLibrary = "legacy"; //TODO: add joda support to groovy
+
+        additionalProperties.put("title", title);
+        additionalProperties.put(CONFIG_PACKAGE, configPackage);
+
+        cliOptions.add(new CliOption(CONFIG_PACKAGE, "configuration package for generated code"));
+
+    }
+
+    @Override
+    public CodegenType getTag() {
+        return CodegenType.CLIENT;
+    }
+
+    @Override
+    public String getName() {
+        return "groovy";
+    }
+
+    @Override
+    public String getHelp() {
+        return "Generates a Groovy API client (beta).";
+    }
+
+    @Override
+    public void processOpts() {
+        super.processOpts();
+
+        if (additionalProperties.containsKey(CONFIG_PACKAGE)) {
+            this.setConfigPackage((String) additionalProperties.get(CONFIG_PACKAGE));
+        }
+
+        supportingFiles.add(new SupportingFile("build.gradle.mustache", "", "build.gradle"));
+        // TODO readme to be added later
+        //supportingFiles.add(new SupportingFile("README.mustache", "", "README.md"));
+        supportingFiles.add(new SupportingFile("ApiUtils.mustache",
+                (sourceFolder + File.separator + apiPackage).replace(".", java.io.File.separator), "ApiUtils.groovy"));
+
+    }
+
+    @Override
+    public String toApiName(String name) {
+        if (name.length() == 0) {
+            return "DefaultApi";
+        }
+        name = sanitizeName(name);
+        return camelize(name) + "Api";
+    }
+
+    public void setConfigPackage(String configPackage) {
+        this.configPackage = configPackage;
+    }
+
+    @Override
+    public String escapeQuotationMark(String input) {
+        // remove ' to avoid code injection
+        return input.replace("'", "");
+    }
+
+    @Override
+    public String escapeUnsafeCharacters(String input) {
+        return input.replace("*/", "*_/").replace("/*", "/_*");
+    }
+}

modules/openapi-generator/src/main/resources/META-INF/services/org.openapitools.codegen.CodegenConfig

@@ -19,6 +19,7 @@ org.openapitools.codegen.languages.ErlangClientCodegen
 org.openapitools.codegen.languages.ErlangServerCodegen
 org.openapitools.codegen.languages.GoClientCodegen
 org.openapitools.codegen.languages.GoServerCodegen
+org.openapitools.codegen.languages.GroovyClientCodegen
 org.openapitools.codegen.languages.KotlinClientCodegen
 org.openapitools.codegen.languages.KotlinServerCodegen
 org.openapitools.codegen.languages.HaskellHttpClientCodegen