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Groovy example source code file (

This example Groovy source code file ( is included in the "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 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
 * 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);

Other Groovy examples (source code examples)

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