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Java > Open Source Codes > org > codehaus > groovy > runtime > ReflectionMethodInvoker


1 /*
2  $Id: ReflectionMethodInvoker.java,v 1.1 2005/06/01 20:00:35 glaforge Exp $
3
4  Copyright 2005 (C) Guillaume Laforge. All Rights Reserved.
5
6  Redistribution and use of this software and associated documentation
7  ("Software"), with or without modification, are permitted provided
8  that the following conditions are met:
9
10  1. Redistributions of source code must retain copyright
11     statements and notices. Redistributions must also contain a
12     copy of this document.
13
14  2. Redistributions in binary form must reproduce the
15     above copyright notice, this list of conditions and the
16     following disclaimer in the documentation and/or other
17     materials provided with the distribution.
18
19  3. The name "groovy" must not be used to endorse or promote
20     products derived from this Software without prior written
21     permission of The Codehaus. For written permission,
22     please contact info@codehaus.org.
23
24  4. Products derived from this Software may not be called "groovy"
25     nor may "groovy" appear in their names without prior written
26     permission of The Codehaus. "groovy" is a registered
27     trademark of The Codehaus.
28
29  5. Due credit should be given to The Codehaus -
30     http://groovy.codehaus.org/
31
32  THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
33  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
34  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
36  THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43  OF THE POSSIBILITY OF SUCH DAMAGE.
44
45  */

46 package org.codehaus.groovy.runtime;
47
48 import java.lang.reflect.Method JavaDoc;
49
50 /**
51  * Utility class to call methods through reflection, and falls through using the <code>Invoker</code> to call the method if it fails.
52  * The class is particularly useful for Groovy classes implementing <code>GroovyIntercpetable</code>,
53  * since it is not possible to call any method from this class,
54  * because it is intercepted by the <code>invokeMethod()</code> method.
55  *
56  * @author Guillaume Laforge
57  */

58 public class ReflectionMethodInvoker {
59
60     /**
61      * Invoke a method through reflection.
62      * Falls through to using the Invoker to call the method in case the reflection call fails..
63      *
64      * @param object the object on which to invoke a method
65      * @param methodName the name of the method to invoke
66      * @param parameters the parameters of the method call
67      * @return the result of the method call
68      */

69     public static Object JavaDoc invoke(Object JavaDoc object, String JavaDoc methodName, Object JavaDoc[] parameters) {
70         try {
71             Class JavaDoc[] classTypes = new Class JavaDoc[parameters.length];
72             for (int i = 0; i < classTypes.length; i++) {
73                 classTypes[i] = parameters[i].getClass();
74             }
75             Method JavaDoc method = object.getClass().getMethod(methodName, classTypes);
76             return method.invoke(object, parameters);
77         } catch (Throwable JavaDoc t) {
78             return InvokerHelper.invokeMethod(object, methodName, parameters);
79         }
80     }
81
82 }
83
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