1 /* 2 $Id: ReflectionMethodInvoker.java,v 1.3 2005/10/03 18:07:36 tug 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; 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 }