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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

interceptor, interceptor, object, object, string, string

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 groovy.lang;

 * Implementers of this interface can be registered in the ProxyMetaClass for
 * notifications about method calls for objects managed by the ProxyMetaClass.
 * See groovy/lang/InterceptorTest.groovy for details.
 * @author Dierk Koenig
public interface Interceptor {
     * This code is executed before the method is optionally called.
     * @param object        receiver object for the method call
     * @param methodName    name of the method to call
     * @param arguments     arguments to the method call
     * @return any arbitrary result that replaces the result of the
     * original method call only if doInvoke() returns false and afterInvoke()
     * relays this result.
    Object beforeInvoke(Object object, String methodName, Object[] arguments);
     * This code is executed after the method is optionally called.
     * @param object        receiver object for the called method
     * @param methodName    name of the called method
     * @param arguments     arguments to the called method
     * @param result        result of the executed method call or result of beforeInvoke if method was not called
     * @return any arbitrary result that can replace the result of the
     * original method call. Typically, the result parameter is returned.
    Object afterInvoke(Object object, String methodName, Object[] arguments, Object result);
     * @return whether the target method should be invoked at all.
    boolean doInvoke();

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