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Groovy example source code file (MixedInMetaClass.java)

This example Groovy source code file (MixedInMetaClass.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

metaclass, mixedinmetaclass, mixedinmetaclass, object, object, ownedmetaclass, ownedmetaclass, string, weakreference, weakreference

The Groovy MixedInMetaClass.java source code

 * Copyright 2003-2007 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.runtime.metaclass;

import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;

import java.lang.ref.WeakReference;

import groovy.lang.*;

 * @author Alex Tkachman
public class MixedInMetaClass extends OwnedMetaClass {
    private final WeakReference owner;

    public MixedInMetaClass(Object instance, Object owner) {
        this.owner = new WeakReference(owner);
        DefaultGroovyMethods.setMetaClass (instance, this);

    protected Object getOwner() {
        return this.owner.get();

    protected MetaClass getOwnerMetaClass(Object owner) {
        return InvokerHelper.getMetaClass(owner);

    public Object invokeMethod(Class sender, Object receiver, String methodName, Object[] arguments, boolean isCallToSuper, boolean fromInsideClass) {
        if (isCallToSuper) {
            return delegate.invokeMethod(sender, receiver, methodName, arguments, true, fromInsideClass);
        return super.invokeMethod(sender, receiver, methodName, arguments, false, fromInsideClass);

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