Mercurial > hg > blitz_condensed
diff src/com/go/trove/util/DelegateClassLoader.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/com/go/trove/util/DelegateClassLoader.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,121 @@ +/* ==================================================================== + * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group + * ==================================================================== + * The Tea Software License, Version 1.1 + * + * Copyright (c) 2000 Walt Disney Internet Group. 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 acknowledgment: + * "This product includes software developed by the + * Walt Disney Internet Group (http://opensource.go.com/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact opensource@dig.com. + * + * 5. Products derived from this software may not be called "Tea", + * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", + * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior + * written permission of the Walt Disney Internet Group. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 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. + * ==================================================================== + * + * For more information about Tea, please see http://opensource.go.com/. + */ + +package com.go.trove.util; +import java.io.InputStream; +import java.net.URL; + +/****************************************************************************** + * ClassLoader that delegates class loading requests if the parent ClassLoader + * (and its ancestors) can't fulfill the request. Class loading requests are + * handed off to scouts, which are called upon in sequence to find the class, + * until the class is found. If neither the parent or scouts can find a + * requested class, a normal ClassNotFoundException is thrown. + * + * @author Brian S O'Neill + * @version + * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 7/27/01 <!-- $--> + */ +public class DelegateClassLoader extends ClassLoader { + private ClassLoader[] mScouts; + + /** + * @param parent ClassLoader that gets first chance to load a class + * @param scouts ClassLoaders that get next chances to load a class, if the + * parent couldn't find it. + */ + public DelegateClassLoader(ClassLoader parent, ClassLoader[] scouts) { + super(parent); + mScouts = (ClassLoader[])scouts.clone(); + } + + /** + * @param scouts ClassLoaders that get next chances to load a class, if the + * parent couldn't find it. + * @deprecated Actual parent ClassLoader must always be provided to prevent + * unexpected behavior. + */ + public DelegateClassLoader(ClassLoader[] scouts) { + super(); + mScouts = (ClassLoader[])scouts.clone(); + } + + protected synchronized Class findClass(String name) + throws ClassNotFoundException + { + for (int i=0; i<mScouts.length; i++) { + try { + return mScouts[i].loadClass(name); + } + catch (ClassNotFoundException e) { + } + } + throw new ClassNotFoundException(name); + } + + protected URL findResource(String name) { + URL resource = null; + + try { + for (int i=0; i<mScouts.length; i++) { + resource = mScouts[i].getResource(name); + if (resource != null) { + return resource; + } + } + } + catch (Exception e) { + e.printStackTrace(); + } + return resource; + } +}