001 /* 002 $Id: ReflectionMethodInvoker.java,v 1.3 2005/10/03 18:07:36 tug Exp $ 003 004 Copyright 2005 (C) Guillaume Laforge. All Rights Reserved. 005 006 Redistribution and use of this software and associated documentation 007 ("Software"), with or without modification, are permitted provided 008 that the following conditions are met: 009 010 1. Redistributions of source code must retain copyright 011 statements and notices. Redistributions must also contain a 012 copy of this document. 013 014 2. Redistributions in binary form must reproduce the 015 above copyright notice, this list of conditions and the 016 following disclaimer in the documentation and/or other 017 materials provided with the distribution. 018 019 3. The name "groovy" must not be used to endorse or promote 020 products derived from this Software without prior written 021 permission of The Codehaus. For written permission, 022 please contact info@codehaus.org. 023 024 4. Products derived from this Software may not be called "groovy" 025 nor may "groovy" appear in their names without prior written 026 permission of The Codehaus. "groovy" is a registered 027 trademark of The Codehaus. 028 029 5. Due credit should be given to The Codehaus - 030 http://groovy.codehaus.org/ 031 032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 043 OF THE POSSIBILITY OF SUCH DAMAGE. 044 045 */ 046 package org.codehaus.groovy.runtime; 047 048 import java.lang.reflect.Method; 049 050 /** 051 * Utility class to call methods through reflection, and falls through using the <code>Invoker</code> to call the method if it fails. 052 * The class is particularly useful for Groovy classes implementing <code>GroovyIntercpetable</code>, 053 * since it is not possible to call any method from this class, 054 * because it is intercepted by the <code>invokeMethod()</code> method. 055 * 056 * @author Guillaume Laforge 057 */ 058 public class ReflectionMethodInvoker { 059 060 /** 061 * Invoke a method through reflection. 062 * Falls through to using the Invoker to call the method in case the reflection call fails.. 063 * 064 * @param object the object on which to invoke a method 065 * @param methodName the name of the method to invoke 066 * @param parameters the parameters of the method call 067 * @return the result of the method call 068 */ 069 public static Object invoke(Object object, String methodName, Object[] parameters) { 070 try { 071 Class[] classTypes = new Class[parameters.length]; 072 for (int i = 0; i < classTypes.length; i++) { 073 classTypes[i] = parameters[i].getClass(); 074 } 075 Method method = object.getClass().getMethod(methodName, classTypes); 076 return method.invoke(object, parameters); 077 } catch (Throwable t) { 078 return InvokerHelper.invokeMethod(object, methodName, parameters); 079 } 080 } 081 082 }