| /* gnu.classpath.tools.doclets.xmldoclet.doctranslet.JarClassLoader |
| Copyright (C) 2001 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| package gnu.classpath.tools.doclets.xmldoclet.doctranslet; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import java.util.jar.JarFile; |
| import java.util.jar.JarEntry; |
| |
| public class JarClassLoader extends ClassLoader { |
| |
| private JarFile jarFile; |
| |
| public JarClassLoader(JarFile jarFile) { |
| this.jarFile = jarFile; |
| } |
| |
| public Class findClass(String name) |
| throws ClassNotFoundException { |
| |
| byte[] b = loadClassData(name); |
| return defineClass(name, b, 0, b.length); |
| } |
| |
| private byte[] loadClassData(String className) |
| throws ClassNotFoundException |
| { |
| String classFileName = className.replace('.', File.separatorChar) + ".class"; |
| |
| try { |
| JarEntry jarEntry = jarFile.getJarEntry(classFileName); |
| if (null != jarEntry) { |
| return readFromStream(jarFile.getInputStream(jarEntry), |
| jarEntry.getSize()); |
| } |
| } |
| catch (IOException ignore_) { |
| } |
| throw new ClassNotFoundException(className); |
| } |
| |
| private byte[] readFromStream(InputStream in, long size) |
| throws IOException |
| { |
| byte[] result = new byte[(int)size]; |
| int nread = 0; |
| int offset = 0; |
| while (offset < size && (nread = in.read(result, offset, (int)(size - offset))) >= 0) { |
| offset += nread; |
| } |
| in.close(); |
| return result; |
| } |
| } |