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/* 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;
}
}
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