Groovy example source code file (Proxy.java)

This example Groovy source code file (Proxy.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

groovyobjectsupport, groovyobjectsupport, iterator, iterator, missingmethodexception, object, object, proxy, proxy, util

The Groovy Proxy.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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.util;

import java.util.Iterator;

import groovy.lang.GroovyObjectSupport;
import groovy.lang.MissingMethodException;
import org.codehaus.groovy.runtime.InvokerHelper;

/**
 * Dynamic groovy proxy for another object.  All method
 * invocations get forwarded to actual object, unless the proxy overrides it.
 * See groovy/util/ProxyTest.groovy for usage details.
 *
 * @author Troy Heninger
 * @author Dierk Koenig
 */
public class Proxy extends GroovyObjectSupport {

    private Object adaptee = null;

    /**
     * This method is for convenience.
     * It allows to get around the need for defining dump ctors is subclasses.
     * See unit tests for details.
     */
    public Proxy wrap(Object adaptee){
        setAdaptee(adaptee);
        return this;
    }

    public Object getAdaptee() {
        return adaptee;
    }

    public void setAdaptee(Object adaptee) {
        this.adaptee = adaptee;
    }

    public Object invokeMethod(String name, Object args) {
        try {
            return super.invokeMethod(name, args);
        }
        catch (MissingMethodException e) {
            return InvokerHelper.invokeMethod(adaptee, name, args);
        }
    }
    
    public Iterator iterator() {
        return InvokerHelper.asIterator(adaptee);
    }

}