001 /* 002 * $Id: ClosureListener.java,v 1.2 2005/04/12 16:38:42 jstrachan Exp $ 003 * 004 * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 * 006 * Redistribution and use of this software and associated documentation 007 * ("Software"), with or without modification, are permitted provided that the 008 * following conditions are met: 1. Redistributions of source code must retain 009 * copyright statements and notices. Redistributions must also contain a copy 010 * of this document. 2. Redistributions in binary form must reproduce the above 011 * copyright notice, this list of conditions and the following disclaimer in 012 * the documentation and/or other materials provided with the distribution. 3. 013 * The name "groovy" must not be used to endorse or promote products derived 014 * from this Software without prior written permission of The Codehaus. For 015 * written permission, please contact info@codehaus.org. 4. Products derived 016 * from this Software may not be called "groovy" nor may "groovy" appear in 017 * their names without prior written permission of The Codehaus. "groovy" is a 018 * registered trademark of The Codehaus. 5. Due credit should be given to The 019 * Codehaus - http://groovy.codehaus.org/ 020 * 021 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY 022 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 023 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 024 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR 025 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 026 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 027 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 028 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 029 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 030 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 031 * DAMAGE. 032 * 033 */ 034 package org.codehaus.groovy.runtime; 035 036 import groovy.lang.Closure; 037 038 import java.lang.reflect.InvocationHandler; 039 import java.lang.reflect.Method; 040 041 /** 042 * Represents a method on an object using a closure which can be invoked at any 043 * time 044 * 045 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 046 * @version $Revision: 1.2 $ 047 */ 048 public class ClosureListener implements InvocationHandler { 049 050 private String listenerMethodName; 051 private Closure closure; 052 053 public ClosureListener(String listenerMethodName, Closure closure) { 054 this.listenerMethodName = listenerMethodName; 055 this.closure = closure; 056 } 057 058 public Object invoke(Object object, Method method, Object[] arguments) throws Throwable { 059 if (listenerMethodName.equals(method.getName())) { 060 /** @todo hack! */ 061 closure.call(arguments[0]); 062 return null; 063 } 064 065 // lets try call this object 066 String name = method.getName(); 067 if (name.equals("equals")) { 068 return object == arguments[0] ? Boolean.TRUE : Boolean.FALSE; 069 } 070 else if (name.equals("hashCode")) { 071 return new Integer(hashCode()); 072 } 073 else if (name.equals("toString")) { 074 return super.toString() + "[listener:" + listenerMethodName + "]"; 075 } 076 077 /* 078 * int paramCount = method.getParameterTypes().length; 079 * 080 * System.out.println("Now calling method: " + method); 081 * 082 * Method[] methods = Object.class.getMethods(); for (int i = 0; i 083 * < methods.length; i++ ) { Method aMethod = methods[i]; if 084 * (name.equals(aMethod.getName()) && 085 * aMethod.getParameterTypes().length == paramCount) { return 086 * aMethod.invoke(object, arguments); } } 087 */ 088 return null; 089 } 090 091 }