1 /*
2 * $Id: ClosureListener.java,v 1.2 2005/04/12 16:38:42 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: 1.2 $
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 }