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:
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12      copy of this document.
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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.
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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
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32   THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
33   ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
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35   FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
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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, Object  [] parameters) {
70          try {
71              Class  [] classTypes = new Class  [parameters.length];
72              for (int i = 0; i < classTypes.length; i++) {
73                  classTypes[i] = parameters[i].getClass();
74              }
75              Method   method = object.getClass().getMethod(methodName, classTypes);
76              return method.invoke(object, parameters);
77          } catch (Throwable   t) {
78              return InvokerHelper.invokeMethod(object, methodName,  parameters);
79          }
80      }
81  
82  }
83
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