01: /*
02: $Id: ReflectionMethodInvoker.java 2910 2005-10-03 18:07:37Z tug $
03:
04: Copyright 2005 (C) Guillaume Laforge. All Rights Reserved.
05:
06: Redistribution and use of this software and associated documentation
07: ("Software"), with or without modification, are permitted provided
08: that the following conditions are met:
09:
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;
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 invoke(Object object, String methodName,
70: Object[] parameters) {
71: try {
72: Class[] classTypes = new Class[parameters.length];
73: for (int i = 0; i < classTypes.length; i++) {
74: classTypes[i] = parameters[i].getClass();
75: }
76: Method method = object.getClass().getMethod(methodName,
77: classTypes);
78: return method.invoke(object, parameters);
79: } catch (Throwable t) {
80: return InvokerHelper.invokeMethod(object, methodName,
81: parameters);
82: }
83: }
84:
85: }
|