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/* gnu.classpath.tools.doclets.xmldoclet.doctranslet.JarClassLoader
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Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath.tools.doclets.xmldoclet.doctranslet;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.jar.JarFile;
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import java.util.jar.JarEntry;
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public class JarClassLoader extends ClassLoader {
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private JarFile jarFile;
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public JarClassLoader(JarFile jarFile) {
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this.jarFile = jarFile;
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}
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public Class findClass(String name)
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throws ClassNotFoundException {
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byte[] b = loadClassData(name);
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return defineClass(name, b, 0, b.length);
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}
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private byte[] loadClassData(String className)
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throws ClassNotFoundException
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{
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String classFileName = className.replace('.', File.separatorChar) + ".class";
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try {
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JarEntry jarEntry = jarFile.getJarEntry(classFileName);
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if (null != jarEntry) {
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return readFromStream(jarFile.getInputStream(jarEntry),
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jarEntry.getSize());
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}
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}
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catch (IOException ignore_) {
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}
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throw new ClassNotFoundException(className);
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}
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private byte[] readFromStream(InputStream in, long size)
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throws IOException
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{
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byte[] result = new byte[(int)size];
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int nread = 0;
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int offset = 0;
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while (offset < size && (nread = in.read(result, offset, (int)(size - offset))) >= 0) {
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offset += nread;
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}
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in.close();
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return result;
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}
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}
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