/* * 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; } } }