groovy.lang.Interceptor Maven / Gradle / Ivy
/*
* 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.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();
}