scouter.util.BytesClassLoader Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package scouter.util;
/**
* @author Paul S.J. Kim([email protected])
*/
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
public class BytesClassLoader extends ClassLoader {
private BytesMap bytes;
public BytesClassLoader(BytesMap bytes) {
this(bytes, null);
}
public BytesClassLoader(BytesMap bytes, ClassLoader parent) {
super(parent);
this.bytes = bytes;
}
public BytesClassLoader(byte[] jarBytes) {
this(jarBytes, null);
}
public BytesClassLoader(byte[] jarBytes, ClassLoader parent) {
super(parent);
this.bytes = load(jarBytes);
}
protected BytesMap load(byte[] bytes) {
BytesMap bmap = new BytesMap();
JarInputStream jar = null;
try {
jar = new JarInputStream(new ByteArrayInputStream(bytes));
for (JarEntry ent = jar.getNextJarEntry(); ent != null; ent = jar.getNextJarEntry()) {
byte[] buff = FileUtil.readAll(jar);
if (buff != null) {
bmap.put(ent.getName(), buff);
}
}
} catch (Exception e) {
} finally {
FileUtil.close(jar);
}
return bmap;
}
protected Class findClass(String classname) throws ClassNotFoundException {
String name = classname.replace('.', '/') + ".class";
byte[] b = bytes.getBytes(name);
if (b == null)
throw new ClassNotFoundException("not found class " + classname);
return defineClass(classname, b, 0, b.length, null);
}
protected URL findResource(String name) {
return bytes.getResource(name);
}
}