| /* |
| * Copyright 2003-2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| /* |
| * This class was taken nearly verbatim from http://junit.sourceforge.net/doc/faq/faq.htm#tests_11 |
| * I did add the setValue(Object, String, Object) |
| * Jason Essington <mailto:jasone@greenrivercomputing.com> |
| */ |
| package wssec; |
| import java.lang.reflect.*; |
| |
| /** |
| * a.k.a. The "ObjectMolester" |
| * <p> |
| * This class is used to access a method or field of an object no |
| * matter what the access modifier of the method or field. The syntax |
| * for accessing fields and methods is out of the ordinary because this |
| * class uses reflection to peel away protection. |
| * <p> |
| * Here is an example of using this to access a private member. |
| * <code>resolveName</code> is a private method of <code>Class</code>. |
| * |
| * <pre> |
| * Class c = Class.class; |
| * System.out.println( |
| * PrivilegedAccessor.invokeMethod( c, |
| * "resolveName", |
| * "/net/iss/common/PrivilegeAccessor" ) ); |
| * </pre> |
| * |
| * @author Charlie Hubbard (chubbard@iss.net) |
| * @author Prashant Dhokte (pdhokte@iss.net) |
| */ |
| |
| public class PrivilegedAccessor { |
| |
| /** |
| * Gets the value of the named field and returns it as an object. |
| * |
| * @param instance the object instance |
| * @param fieldName the name of the field |
| * @return an object representing the value of the field |
| */ |
| public static Object getValue( Object instance, String fieldName ) |
| throws IllegalAccessException, NoSuchFieldException { |
| Field field = getField(instance.getClass(), fieldName); |
| field.setAccessible(true); |
| return field.get(instance); |
| } |
| |
| /** |
| * Sets the value of the given field on the object instance supplied to the value supplied. |
| * @param instance the object instance |
| * @param fieldName the name of the field |
| * @param value the value to assign to the field |
| * @throws IllegalAccessException |
| * @throws NoSuchFieldException |
| */ |
| public static void setValue( Object instance, String fieldName, Object value ) |
| throws IllegalAccessException, NoSuchFieldException { |
| Field field = getField(instance.getClass(), fieldName); |
| field.setAccessible(true); |
| field.set(instance, value); |
| } |
| |
| /** |
| * Calls a method on the given object instance with the given argument. |
| * |
| * @param instance the object instance |
| * @param methodName the name of the method to invoke |
| * @param arg the argument to pass to the method |
| * @see PrivilegedAccessor#invokeMethod(Object,String,Object[]) |
| */ |
| public static Object invokeMethod( Object instance, String methodName, Object arg ) throws NoSuchMethodException, |
| IllegalAccessException, InvocationTargetException { |
| Object[] args = new Object[1]; |
| args[0] = arg; |
| return invokeMethod(instance, methodName, args); |
| } |
| |
| /** |
| * Calls a method on the given object instance with the given arguments. |
| * |
| * @param instance the object instance |
| * @param methodName the name of the method to invoke |
| * @param args an array of objects to pass as arguments |
| * @see PrivilegedAccessor#invokeMethod(Object,String,Object) |
| */ |
| public static Object invokeMethod( Object instance, String methodName, Object[] args ) throws NoSuchMethodException, |
| IllegalAccessException, InvocationTargetException { |
| Class[] classTypes = null; |
| if( args != null) { |
| classTypes = new Class[args.length]; |
| for( int i = 0; i < args.length; i++ ) { |
| if( args[i] != null ) |
| classTypes[i] = args[i].getClass(); |
| } |
| } |
| return getMethod(instance,methodName,classTypes).invoke(instance,args); |
| } |
| |
| /** |
| * |
| * @param instance the object instance |
| * @param methodName the |
| */ |
| public static Method getMethod( Object instance, String methodName, Class[] classTypes ) throws NoSuchMethodException { |
| Method accessMethod = getMethod(instance.getClass(), methodName, classTypes); |
| accessMethod.setAccessible(true); |
| return accessMethod; |
| } |
| |
| /** |
| * Return the named field from the given class. |
| */ |
| private static Field getField(Class thisClass, String fieldName) throws NoSuchFieldException { |
| if (thisClass == null) |
| throw new NoSuchFieldException("Invalid field : " + fieldName); |
| try { |
| return thisClass.getDeclaredField( fieldName ); |
| } |
| catch(NoSuchFieldException e) { |
| return getField(thisClass.getSuperclass(), fieldName); |
| } |
| } |
| |
| /** |
| * Return the named method with a method signature matching classTypes |
| * from the given class. |
| */ |
| private static Method getMethod(Class thisClass, String methodName, Class[] classTypes) throws NoSuchMethodException { |
| if (thisClass == null) |
| throw new NoSuchMethodException("Invalid method : " + methodName); |
| try { |
| return thisClass.getDeclaredMethod( methodName, classTypes ); |
| } |
| catch(NoSuchMethodException e) { |
| return getMethod(thisClass.getSuperclass(), methodName, classTypes); |
| } |
| } |
| } |