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Groovy example source code file (EnumHelper.java)

This example Groovy source code file (EnumHelper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

classnode, classnode, enumhelper, expression, fieldnode, fs, genericstype, genericstype, listexpression, listexpression, public_fs, public_fs, string

The Groovy EnumHelper.java source code

 * Copyright 2003-2010 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.codehaus.groovy.antlr;

import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.GenericsType;
import org.codehaus.groovy.ast.InnerClassNode;
import org.codehaus.groovy.ast.MixinNode;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.ListExpression;
import org.objectweb.asm.Opcodes;

public class EnumHelper {
    private static final int FS = Opcodes.ACC_FINAL | Opcodes.ACC_STATIC;
    private static final int PUBLIC_FS = Opcodes.ACC_PUBLIC | FS; 
    public static ClassNode makeEnumNode(String name, int modifiers, ClassNode[] interfaces, ClassNode outerClass) {
        modifiers = modifiers | Opcodes.ACC_FINAL | Opcodes.ACC_ENUM;
        ClassNode enumClass;
        if (outerClass==null) {
            enumClass = new ClassNode(name,modifiers,null,interfaces,MixinNode.EMPTY_ARRAY);
        } else {
            name = outerClass.getName() + "$" + name;
            enumClass = new InnerClassNode(outerClass,name,modifiers,null,interfaces,MixinNode.EMPTY_ARRAY);
        // set super class and generics info
        // "enum X" -> class X extends Enum<X>
        GenericsType gt = new GenericsType(enumClass);
        ClassNode superClass = ClassHelper.makeWithoutCaching("java.lang.Enum");
        superClass.setGenericsTypes(new GenericsType[]{gt});
        return enumClass;

    public static void addEnumConstant(ClassNode enumClass, String name, Expression init) {
        int modifiers = PUBLIC_FS | Opcodes.ACC_ENUM;
        if  (init!=null && !(init instanceof ListExpression)) {
            ListExpression list = new ListExpression();
            init = list;
        FieldNode fn = new FieldNode(name,modifiers,enumClass,enumClass,init);

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