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// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at 
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses. 
// ========================================================================

package org.eclipse.jetty.util;

import java.net.URL;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/* ------------------------------------------------------------ */
/** ClassLoader Helper.
 * This helper class allows classes to be loaded either from the
 * Thread's ContextClassLoader, the classloader of the derived class
 * or the system ClassLoader.
 *
 * Usage:
 * public class MyClass {
 *     void myMethod() {
 *          ...
 *          Class c=Loader.loadClass(this.getClass(),classname);
 *          ...
 *     }
 * 
* */ public class Loader { /* ------------------------------------------------------------ */ public static URL getResource(Class loadClass,String name, boolean checkParents) throws ClassNotFoundException { URL url =null; ClassLoader loader=Thread.currentThread().getContextClassLoader(); while (url==null && loader!=null ) { url=loader.getResource(name); loader=(url==null&&checkParents)?loader.getParent():null; } loader=loadClass==null?null:loadClass.getClassLoader(); while (url==null && loader!=null ) { url=loader.getResource(name); loader=(url==null&&checkParents)?loader.getParent():null; } if (url==null) { url=ClassLoader.getSystemResource(name); } return url; } /* ------------------------------------------------------------ */ @SuppressWarnings("rawtypes") public static Class loadClass(Class loadClass,String name) throws ClassNotFoundException { return loadClass(loadClass,name,false); } /* ------------------------------------------------------------ */ /** Load a class. * * @param loadClass * @param name * @param checkParents If true, try loading directly from parent classloaders. * @return Class * @throws ClassNotFoundException */ @SuppressWarnings("rawtypes") public static Class loadClass(Class loadClass,String name,boolean checkParents) throws ClassNotFoundException { ClassNotFoundException ex=null; Class c =null; ClassLoader loader=Thread.currentThread().getContextClassLoader(); while (c==null && loader!=null ) { try { c=loader.loadClass(name); } catch (ClassNotFoundException e) {if(ex==null)ex=e;} loader=(c==null&&checkParents)?loader.getParent():null; } loader=loadClass==null?null:loadClass.getClassLoader(); while (c==null && loader!=null ) { try { c=loader.loadClass(name); } catch (ClassNotFoundException e) {if(ex==null)ex=e;} loader=(c==null&&checkParents)?loader.getParent():null; } if (c==null) { try { c=Class.forName(name); } catch (ClassNotFoundException e) {if(ex==null)ex=e;} } if (c!=null) return c; throw ex; } public static ResourceBundle getResourceBundle(Class loadClass,String name,boolean checkParents, Locale locale) throws MissingResourceException { MissingResourceException ex=null; ResourceBundle bundle =null; ClassLoader loader=Thread.currentThread().getContextClassLoader(); while (bundle==null && loader!=null ) { try { bundle=ResourceBundle.getBundle(name, locale, loader); } catch (MissingResourceException e) {if(ex==null)ex=e;} loader=(bundle==null&&checkParents)?loader.getParent():null; } loader=loadClass==null?null:loadClass.getClassLoader(); while (bundle==null && loader!=null ) { try { bundle=ResourceBundle.getBundle(name, locale, loader); } catch (MissingResourceException e) {if(ex==null)ex=e;} loader=(bundle==null&&checkParents)?loader.getParent():null; } if (bundle==null) { try { bundle=ResourceBundle.getBundle(name, locale); } catch (MissingResourceException e) {if(ex==null)ex=e;} } if (bundle!=null) return bundle; throw ex; } }




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