1 /* 2 * $Id: ClosureListener.java,v 1.1 2004/01/05 07:13:07 jstrachan Exp $ 3 * 4 * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 5 * 6 * Redistribution and use of this software and associated documentation 7 * ("Software"), with or without modification, are permitted provided that the 8 * following conditions are met: 1. Redistributions of source code must retain 9 * copyright statements and notices. Redistributions must also contain a copy 10 * of this document. 2. Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 3. 13 * The name "groovy" must not be used to endorse or promote products derived 14 * from this Software without prior written permission of The Codehaus. For 15 * written permission, please contact info@codehaus.org. 4. Products derived 16 * from this Software may not be called "groovy" nor may "groovy" appear in 17 * their names without prior written permission of The Codehaus. "groovy" is a 18 * registered trademark of The Codehaus. 5. Due credit should be given to The 19 * Codehaus - http://groovy.codehaus.org/ 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY 22 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR 25 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 27 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 31 * DAMAGE. 32 * 33 */ 34 package org.codehaus.groovy.runtime; 35 36 import groovy.lang.Closure; 37 38 import java.lang.reflect.InvocationHandler; 39 import java.lang.reflect.Method; 40 41 /*** 42 * Represents a method on an object using a closure which can be invoked at any 43 * time 44 * 45 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 46 * @version $Revision: 1.1 $ 47 */ 48 public class ClosureListener implements InvocationHandler { 49 50 private String listenerMethodName; 51 private Closure closure; 52 53 public ClosureListener(String listenerMethodName, Closure closure) { 54 this.listenerMethodName = listenerMethodName; 55 this.closure = closure; 56 } 57 58 public Object invoke(Object object, Method method, Object[] arguments) throws Throwable { 59 if (listenerMethodName.equals(method.getName())) { 60 /*** @todo hack! */ 61 closure.call(arguments[0]); 62 return null; 63 } 64 65 // lets try call this object 66 String name = method.getName(); 67 if (name.equals("equals")) { 68 return object == arguments[0] ? Boolean.TRUE : Boolean.FALSE; 69 } 70 else if (name.equals("hashCode")) { 71 return new Integer(hashCode()); 72 } 73 else if (name.equals("toString")) { 74 return super.toString() + "[listener:" + listenerMethodName + "]"; 75 } 76 77 /* 78 * int paramCount = method.getParameterTypes().length; 79 * 80 * System.out.println("Now calling method: " + method); 81 * 82 * Method[] methods = Object.class.getMethods(); for (int i = 0; i 83 * < methods.length; i++ ) { Method aMethod = methods[i]; if 84 * (name.equals(aMethod.getName()) && 85 * aMethod.getParameterTypes().length == paramCount) { return 86 * aMethod.invoke(object, arguments); } } 87 */ 88 return null; 89 } 90 91 public boolean equals(Object that) { 92 return this == that; 93 } 94 95 }