| /* |
| * 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 com.sun.istack.internal.tools; |
| |
| import java.io.InputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.net.URL; |
| import java.net.MalformedURLException; |
| import java.util.Enumeration; |
| |
| /** |
| * Load classes/resources from a side folder, so that |
| * classes of the same package can live in a single jar file. |
| * |
| * <p> |
| * For example, with the following jar file: |
| * <pre> |
| * / |
| * +- foo |
| * +- X.class |
| * +- bar |
| * +- X.class |
| * </pre> |
| * <p> |
| * {@link ParallelWorldClassLoader}("foo/") would load <tt>X.class<tt> from |
| * <tt>/foo/X.class</tt> (note that X is defined in the root package, not |
| * <tt>foo.X</tt>. |
| * |
| * <p> |
| * This can be combined with {@link MaskingClassLoader} to mask classes which are loaded by the parent |
| * class loader so that the child class loader |
| * classes living in different folders are loaded |
| * before the parent class loader loads classes living the jar file publicly |
| * visible |
| * For example, with the following jar file: |
| * <pre> |
| * / |
| * +- foo |
| * +- X.class |
| * +- bar |
| * +-foo |
| * +- X.class |
| * </pre> |
| * <p> |
| * {@link ParallelWorldClassLoader}(MaskingClassLoader.class.getClassLoader()) would load <tt>foo.X.class<tt> from |
| * <tt>/bar/foo.X.class</tt> not the <tt>foo.X.class<tt> in the publicly visible place in the jar file, thus |
| * masking the parent classLoader from loading the class from <tt>foo.X.class<tt> |
| * (note that X is defined in the package foo, not |
| * <tt>bar.foo.X</tt>. |
| * |
| * @author Kohsuke Kawaguchi |
| */ |
| public class ParallelWorldClassLoader extends ClassLoader { |
| |
| /** |
| * Strings like "prefix/", "abc/", or "" to indicate |
| * classes should be loaded normally. |
| */ |
| private final String prefix; |
| |
| public ParallelWorldClassLoader(ClassLoader parent,String prefix) { |
| super(parent); |
| this.prefix = prefix; |
| } |
| |
| protected Class findClass(String name) throws ClassNotFoundException { |
| StringBuffer sb = new StringBuffer(name.length()+prefix.length()+6); |
| sb.append(prefix).append(name.replace('.','/')).append(".class"); |
| |
| InputStream is = getParent().getResourceAsStream(sb.toString()); |
| if (is==null) |
| throw new ClassNotFoundException(name); |
| |
| try { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| byte[] buf = new byte[1024]; |
| int len; |
| while((len=is.read(buf))>=0) |
| baos.write(buf,0,len); |
| |
| buf = baos.toByteArray(); |
| int packIndex = name.lastIndexOf('.'); |
| if (packIndex != -1) { |
| String pkgname = name.substring(0, packIndex); |
| // Check if package already loaded. |
| Package pkg = getPackage(pkgname); |
| if (pkg == null) { |
| definePackage(pkgname, null, null, null, null, null, null, null); |
| } |
| } |
| return defineClass(name,buf,0,buf.length); |
| } catch (IOException e) { |
| throw new ClassNotFoundException(name,e); |
| } |
| } |
| |
| protected URL findResource(String name) { |
| return getParent().getResource(prefix+name); |
| } |
| |
| protected Enumeration<URL> findResources(String name) throws IOException { |
| return getParent().getResources( prefix+name); |
| } |
| |
| /** |
| * Given the URL inside jar, returns the URL to the jar itself. |
| */ |
| public static URL toJarUrl(URL res) throws ClassNotFoundException, MalformedURLException { |
| String url = res.toExternalForm(); |
| if(!url.startsWith("jar:")) |
| throw new ClassNotFoundException("Loaded outside a jar "+url); |
| url = url.substring(4); // cut off jar: |
| url = url.substring(0,url.lastIndexOf('!')); // cut off everything after '!' |
| return new URL(url); |
| } |
| } |