001    /*
002     $Id: ReflectionMethodInvoker.java 2910 2005-10-03 18:07:37Z tug $
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    }