org.milyn.archive.ArchiveClassLoader Maven / Gradle / Ivy
/*
* Milyn - Copyright (C) 2006 - 2010
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License (version 2.1) as published by the Free Software
* Foundation.
*
* This library 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 Lesser General Public License for more details:
* http://www.gnu.org/licenses/lgpl.txt
*/
package org.milyn.archive;
import org.milyn.assertion.AssertArgument;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
/**
* {@link Archive} based {@link ClassLoader}.
*
* [email protected]
*/
public class ArchiveClassLoader extends ClassLoader {
private Archive archive;
private Map loadedClasses = new HashMap();
public ArchiveClassLoader(Archive archive) {
this(Thread.currentThread().getContextClassLoader(), archive);
}
public ArchiveClassLoader(ClassLoader parent, Archive archive) {
super(parent);
AssertArgument.isNotNull(archive, "archive");
this.archive = archive;
}
@Override
public Class loadClass(String name) throws ClassNotFoundException {
Class loadedClass = loadedClasses.get(name);
if(loadedClass != null) {
return loadedClass;
}
String resName = name.replace('.', '/') + ".class";
byte[] classBytes = archive.getEntries().get(resName);
if(classBytes != null) {
loadedClass = defineClass(name, classBytes, 0, classBytes.length);
loadedClasses.put(name, loadedClass);
return loadedClass;
} else {
return super.loadClass(name);
}
}
@Override
public InputStream getResourceAsStream(String name) {
byte[] bytes = archive.getEntries().get(name);
if (bytes != null) {
return new ByteArrayInputStream(bytes);
} else {
return super.getResourceAsStream(name);
}
}
}