| /******************************************************************************* |
| * Copyright (c) 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.core.runtime.adaptor; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.Enumeration; |
| |
| public class ContextFinder extends ClassLoader { |
| |
| private static final class Finder extends SecurityManager { |
| public Class[] getClassContext() { |
| return super.getClassContext(); |
| } |
| } |
| |
| static final Finder contextFinder = (Finder) AccessController.doPrivileged(new PrivilegedAction() { |
| public Object run() { |
| return new Finder(); |
| } |
| }); |
| |
| public ContextFinder(ClassLoader contextClassLoader) { |
| super(contextClassLoader); |
| } |
| |
| ClassLoader basicFindClassLoader() { |
| Class[] stack = contextFinder.getClassContext(); |
| for (int i = 1; i < stack.length; i++) { |
| if (stack[i] != ContextFinder.class && stack[i] != ClassLoader.class) |
| return stack[i].getClassLoader(); |
| } |
| return null; |
| } |
| |
| private ClassLoader findClassLoader() { |
| if (System.getSecurityManager() == null) { |
| return basicFindClassLoader(); |
| } |
| |
| return (ClassLoader) AccessController.doPrivileged(new PrivilegedAction() { |
| public Object run() { |
| return basicFindClassLoader(); |
| } |
| }); |
| } |
| |
| protected synchronized Class loadClass(String arg0, boolean arg1) throws ClassNotFoundException { |
| Class result = null; |
| try { |
| result = super.loadClass(arg0, arg1); |
| } catch (ClassNotFoundException e) { |
| //Ignore |
| } |
| if (result == null) { |
| ClassLoader toConsult = findClassLoader(); |
| if (toConsult != null && toConsult != getParent()) |
| result = findClassLoader().loadClass(arg0); |
| } |
| return result; |
| } |
| |
| protected URL findResource(String arg0) { |
| URL result = super.findResource(arg0); |
| if (result == null) { |
| ClassLoader toConsult = findClassLoader(); |
| if (toConsult != null && toConsult != getParent()) |
| result = findClassLoader().getResource(arg0); |
| } |
| return result; |
| } |
| |
| protected Enumeration findResources(String arg0) { |
| try { |
| Enumeration result = super.findResources(arg0); |
| if (result == null) { |
| ClassLoader toConsult = findClassLoader(); |
| if (toConsult != null && toConsult != getParent()) |
| result = toConsult.getResources(arg0); |
| } |
| return result; |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| } |