| /* |
| * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| package sun.swing; |
| |
| import java.security.*; |
| import java.lang.reflect.*; |
| |
| /** |
| * A utility for accessing and invoking methods, via reflection, |
| * that would otherwise be unaccessible. |
| * |
| * @author Shannon Hickey |
| */ |
| public class AccessibleMethod { |
| |
| private final Method method; |
| |
| /** |
| * Construct an instance for the given params. |
| * |
| * @param klass the class to which the method belongs |
| * @param methodName the name of the method |
| * @param paramTypes the paramater type array |
| * @throws NullPointerException if <code>klass</code> |
| * or <code>name</code> is <code>null</code> |
| * @throws NoSuchMethodException if the method can't be found |
| */ |
| public AccessibleMethod(Class klass, |
| String methodName, |
| Class ... paramTypes) throws NoSuchMethodException { |
| try { |
| method = AccessController.doPrivileged( |
| new AccessMethodAction(klass, methodName, paramTypes)); |
| } catch (PrivilegedActionException e) { |
| throw (NoSuchMethodException)e.getCause(); |
| } |
| } |
| |
| /** |
| * Invoke the method that this object represents. |
| * Has the same behavior and throws the same exceptions as |
| * <code>java.lang.reflect.Method.invoke</code> with one |
| * exception: This method does not throw |
| * <code>IllegalAccessException</code> since the target |
| * method has already been made accessible. |
| * |
| * @param obj the object the underlying method is invoked from |
| * @param args the arguments used for the method call |
| * @return the result of dispatching the method represented by |
| * this object on <code>obj</code> with parameters |
| * <code>args</code> |
| * @see java.lang.reflect.Method#invoke |
| */ |
| public Object invoke(Object obj, Object ... args) |
| throws IllegalArgumentException, InvocationTargetException { |
| |
| try { |
| return method.invoke(obj, args); |
| } catch (IllegalAccessException e) { |
| // should never happen since we've made it accessible |
| throw new AssertionError("accessible method inaccessible"); |
| } |
| } |
| |
| /** |
| * Invoke the method that this object represents, with the |
| * expectation that the method being called throws no |
| * checked exceptions. |
| * <p> |
| * Simply calls <code>this.invoke(obj, args)</code> |
| * but catches any <code>InvocationTargetException</code> |
| * and returns the cause wrapped in a runtime exception. |
| * |
| * @param obj the object the underlying method is invoked from |
| * @param args the arguments used for the method call |
| * @return the result of dispatching the method represented by |
| * this object on <code>obj</code> with parameters |
| * <code>args</code> |
| * @see #invoke |
| */ |
| public Object invokeNoChecked(Object obj, Object ... args) { |
| try { |
| return invoke(obj, args); |
| } catch (InvocationTargetException ex) { |
| if (ex.getCause() instanceof RuntimeException) { |
| throw (RuntimeException)ex.getCause(); |
| } else { |
| throw new RuntimeException(ex.getCause()); |
| } |
| } |
| } |
| |
| /** The action used to fetch the method and make it accessible */ |
| private static class AccessMethodAction implements PrivilegedExceptionAction<Method> { |
| private final Class klass; |
| private final String methodName; |
| private final Class[] paramTypes; |
| |
| public AccessMethodAction(Class klass, |
| String methodName, |
| Class ... paramTypes) { |
| |
| this.klass = klass; |
| this.methodName = methodName; |
| this.paramTypes = paramTypes; |
| } |
| |
| public Method run() throws NoSuchMethodException { |
| Method method = klass.getDeclaredMethod(methodName, paramTypes); |
| method.setAccessible(true); |
| return method; |
| } |
| } |
| } |