/*
* 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 <code>ByteArrayClassPath</code> contains bytes that is served as
* a class file to a <code>ClassPool</code>. It is useful to convert
* a byte array to a <code>CtClass</code> object.
*
* <p>For example, if you want to convert a byte array <code>b</code>
* into a <code>CtClass</code> object representing the class with a name
* <code>classname</code>, then do as following:
*
* <pre>
* ClassPool cp = ClassPool.getDefault();
* cp.insertClassPath(new ByteArrayClassPath(classname, b));
* CtClass cc = cp.get(classname);
* </pre>
*
* <p>The <code>ClassPool</code> object <code>cp</code> uses the created
* <code>ByteArrayClassPath</code> object as the source of the class file.
*
* <p>A <code>ByteArrayClassPath</code> 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 <code>ByteArrayClassPath</code> 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;
}
}
}