javassist.ByteArrayClassPath Maven / Gradle / Ivy
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
/**
* A ByteArrayClassPath contains bytes that is served as
* a class file to a ClassPool. It is useful to convert
* a byte array to a CtClass object.
*
* For example, if you want to convert a byte array b
* into a CtClass object representing the class with a name
* classname, then do as following:
*
*
* ClassPool cp = ClassPool.getDefault();
* cp.insertClassPath(new ByteArrayClassPath(classname, b));
* CtClass cc = cp.get(classname);
*
*
* The ClassPool object cp uses the created
* ByteArrayClassPath object as the source of the class file.
*
*
A ByteArrayClassPath must be instantiated for every
* class. It contains only a single class file.
*
* @see javassist.ClassPath
* @see ClassPool#insertClassPath(ClassPath)
* @see ClassPool#appendClassPath(ClassPath)
* @see ClassPool#makeClass(InputStream)
*/
public class ByteArrayClassPath implements ClassPath {
protected String classname;
protected byte[] classfile;
/*
* Creates a ByteArrayClassPath containing the given
* bytes.
*
* @param name a fully qualified class name
* @param classfile the contents of a class file.
*/
public ByteArrayClassPath(String name, byte[] classfile) {
this.classname = name;
this.classfile = classfile;
}
@Override
public String toString() {
return "byte[]:" + classname;
}
/**
* Opens the class file.
*/
@Override
public InputStream openClassfile(String classname) {
if(this.classname.equals(classname))
return new ByteArrayInputStream(classfile);
return null;
}
/**
* Obtains the URL.
*/
@Override
public URL find(String classname) {
if(this.classname.equals(classname)) {
String cname = classname.replace('.', '/') + ".class";
try {
return new URL(null, "file:/ByteArrayClassPath/" + cname, new BytecodeURLStreamHandler());
}
catch (MalformedURLException e) {}
}
return null;
}
private class BytecodeURLStreamHandler extends URLStreamHandler {
protected URLConnection openConnection(final URL u) {
return new BytecodeURLConnection(u);
}
}
private class BytecodeURLConnection extends URLConnection {
protected BytecodeURLConnection(URL url) {
super(url);
}
public void connect() throws IOException {
}
public InputStream getInputStream() throws IOException {
return new ByteArrayInputStream(classfile);
}
public int getContentLength() {
return classfile.length;
}
}
}