| /* |
| * ==================================================================== |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 1999-2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Commons", and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
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| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| |
| package org.apache.commons.beanutils; |
| |
| |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.lang.reflect.InvocationTargetException; |
| |
| |
| /** |
| * <p> Utility reflection methods focussed on methods in general rather than properties in particular. </p> |
| * |
| * @author Craig R. McClanahan |
| * @author Ralph Schaer |
| * @author Chris Audley |
| * @author Rey François |
| * @author Gregor Raýman |
| * @author Jan Sorensen |
| * @author Robert Burrell Donkin |
| */ |
| |
| public class MethodUtils { |
| |
| |
| // --------------------------------------------------------- Public Methods |
| |
| |
| /** |
| * <p>Invoke a method whose parameter type matches exactly the object |
| * type.</p> |
| * |
| * <p> This is a convenient wrapper for |
| * {@link #invokeExactMethod(Object object,String methodName,Object [] args)}. |
| * </p> |
| * |
| * @param object invoke method on this object |
| * @param methodName get method with this name |
| * @param arg use this argument |
| * |
| * @throw NoSuchMethodException if there is no such accessible method |
| * @throw InvocationTargetException wraps an exception thrown by the |
| * method invoked |
| * @throw IllegalAccessException if the requested method is not accessible |
| * via reflection |
| */ |
| public static Object invokeExactMethod( |
| Object object, |
| String methodName, |
| Object arg) |
| throws |
| NoSuchMethodException, |
| IllegalAccessException, |
| InvocationTargetException |
| { |
| |
| Object [] args = {arg}; |
| return invokeExactMethod(object, methodName, args); |
| |
| } |
| |
| |
| /** |
| * <p>Invoke a method whose parameter types match exactly the object |
| * types.</p> |
| * |
| * <p> This uses reflection to invoke the method obtained from a call to |
| * {@link #getAccessibleMethod}.</p> |
| * |
| * @param object invoke method on this object |
| * @param methodName get method with this name |
| * @param args use these arguments |
| * |
| * @throw NoSuchMethodException if there is no such accessible method |
| * @throw InvocationTargetException wraps an exception thrown by the |
| * method invoked |
| * @throw IllegalAccessException if the requested method is not accessible |
| * via reflection |
| */ |
| public static Object invokeExactMethod( |
| Object object, |
| String methodName, |
| Object [] args) |
| throws |
| NoSuchMethodException, |
| IllegalAccessException, |
| InvocationTargetException |
| { |
| |
| int arguments = args.length; |
| Class parameterTypes [] = new Class[arguments]; |
| for (int i=0; i<arguments ;i++) |
| { |
| parameterTypes[i] = args[i].getClass(); |
| } |
| return invokeExactMethod(object, methodName, args, parameterTypes); |
| |
| } |
| |
| |
| /** |
| * <p>Invoke a method whose parameter types match exactly the parameter |
| * types given.</p> |
| * |
| * <p>This uses reflection to invoke the method obtained from a call to |
| * {@link #getAccessibleMethod}.</p> |
| * |
| * @param object invoke method on this object |
| * @param methodName get method with this name |
| * @param args use these arguments |
| * @param parameterTypes match these parameters |
| * |
| * @throw NoSuchMethodException if there is no such accessible method |
| * @throw InvocationTargetException wraps an exception thrown by the |
| * method invoked |
| * @throw IllegalAccessException if the requested method is not accessible |
| * via reflection |
| */ |
| public static Object invokeExactMethod( |
| Object object, |
| String methodName, |
| Object [] args, |
| Class [] parameterTypes) |
| throws |
| NoSuchMethodException, |
| IllegalAccessException, |
| InvocationTargetException |
| { |
| |
| Method method = getAccessibleMethod( |
| object.getClass(), |
| methodName, |
| parameterTypes); |
| if (method == null) |
| throw new NoSuchMethodException("No such accessible method."); |
| return method.invoke(object, args); |
| |
| } |
| |
| |
| /** |
| * <p>Return an accessible method (that is, one that can be invoked via |
| * reflection) with given name and a single parameter. If no such method |
| * can be found, return <code>null</code>. |
| * Basically, a convenience wrapper that constructs a <code>Class</code> |
| * array for you.</p> |
| * |
| * @param clazz get method from this class |
| * @param methodName get method with this name |
| * @param parameterType taking this type of parameter |
| */ |
| public static Method getAccessibleMethod( |
| Class clazz, |
| String methodName, |
| Class parameterType) |
| { |
| |
| Class [] parameterTypes = {parameterType}; |
| return getAccessibleMethod(clazz, methodName, parameterTypes); |
| |
| } |
| |
| |
| /** |
| * <p>Return an accessible method (that is, one that can be invoked via |
| * reflection) with given name and parameters. If no such method |
| * can be found, return <code>null</code>. |
| * This is just a convenient wrapper for |
| * {@link #getAccessibleMethod(Method method)}.</p> |
| * |
| * @param clazz get method from this class |
| * @param methodName get method with this name |
| * @param parameterTypes with these parameters types |
| */ |
| public static Method getAccessibleMethod( |
| Class clazz, |
| String methodName, |
| Class[] parameterTypes) |
| { |
| |
| try { |
| return getAccessibleMethod |
| (clazz.getMethod(methodName, parameterTypes)); |
| } catch (NoSuchMethodException e) { |
| return (null); |
| } |
| |
| } |
| |
| |
| /** |
| * <p>Return an accessible method (that is, one that can be invoked via |
| * reflection) that implements the specified Method. If no such method |
| * can be found, return <code>null</code>.</p> |
| * |
| * @param method The method that we wish to call |
| */ |
| public static Method getAccessibleMethod(Method method) { |
| |
| // Make sure we have a method to check |
| if (method == null) { |
| return (null); |
| } |
| |
| // If the requested method is not public we cannot call it |
| if (!Modifier.isPublic(method.getModifiers())) { |
| return (null); |
| } |
| |
| // If the declaring class is public, we are done |
| Class clazz = method.getDeclaringClass(); |
| if (Modifier.isPublic(clazz.getModifiers())) { |
| return (method); |
| } |
| |
| // Check the implemented interfaces and subinterfaces |
| String methodName = method.getName(); |
| Class[] parameterTypes = method.getParameterTypes(); |
| method = |
| getAccessibleMethodFromInterfaceNest(clazz, |
| method.getName(), |
| method.getParameterTypes()); |
| return (method); |
| |
| } |
| |
| |
| // -------------------------------------------------------- Private Methods |
| |
| /** |
| * <p>Return an accessible method (that is, one that can be invoked via |
| * reflection) that implements the specified method, by scanning through |
| * all implemented interfaces and subinterfaces. If no such method |
| * can be found, return <code>null</code>.</p> |
| * |
| * <p> There isn't any good reason why this method must be private. |
| * It is because there doesn't seem any reason why other classes should |
| * call this rather than the higher level methods.</p> |
| * |
| * @param clazz Parent class for the interfaces to be checked |
| * @param methodName Method name of the method we wish to call |
| * @param parameterTypes The parameter type signatures |
| */ |
| private static Method getAccessibleMethodFromInterfaceNest |
| (Class clazz, String methodName, Class parameterTypes[]) { |
| |
| Method method = null; |
| |
| // Search up the superclass chain |
| for ( ; clazz != null; clazz = clazz.getSuperclass()) { |
| |
| // Check the implemented interfaces of the parent class |
| Class interfaces[] = clazz.getInterfaces(); |
| for (int i = 0; i < interfaces.length; i++) { |
| |
| // Is this interface public? |
| if (!Modifier.isPublic(interfaces[i].getModifiers())) |
| continue; |
| |
| // Does the method exist on this interface? |
| try { |
| method = interfaces[i].getDeclaredMethod(methodName, |
| parameterTypes); |
| } catch (NoSuchMethodException e) { |
| ; |
| } |
| if (method != null) |
| break; |
| |
| // Recursively check our parent interfaces |
| method = |
| getAccessibleMethodFromInterfaceNest(interfaces[i], |
| methodName, |
| parameterTypes); |
| if (method != null) |
| break; |
| |
| } |
| |
| } |
| |
| // If we found a method return it |
| if (method != null) |
| return (method); |
| |
| // We did not find anything |
| return (null); |
| |
| } |
| |
| |
| } |