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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2003 Shigeru Chiba. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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.
*/
package javassist;
import java.io.*;
import java.net.*;
/**
* A class search-path specified with URL (http).
*
* @see javassist.ClassPath
* @see ClassPool#insertClassPath(ClassPath)
* @see ClassPool#appendClassPath(ClassPath)
*/
public class URLClassPath implements ClassPath {
protected String hostname;
protected int port;
protected String directory;
protected String packageName;
/**
* Creates a search path specified with URL (http).
*
* <p>This search path is used only if a requested
* class name starts with the name specified by <code>packageName</code>.
* If <code>packageName</code> is "mypack" and a requested class is
* "mypack.sub.Test", then the given URL is used for loading that class.
* If <code>packageName</code> is <code>null</code>, the URL is used
* for loading any class.
*
* @param host host name
* @param port port number
* @param directory directory name ending with "/".
* It can be "/" (root directory).
* @param packageName package name.
*/
public URLClassPath(String host, int port,
String directory, String packageName) {
hostname = host;
this.port = port;
this.directory = directory;
this.packageName = packageName;
}
public String toString() {
return hostname + ":" + port + directory;
}
/**
* Opens a class file with http.
*/
public InputStream openClassfile(String classname) {
try {
if (packageName == null || classname.startsWith(packageName)) {
String jarname
= directory + classname.replace('.', '/') + ".class";
URLConnection con = fetchClass0(hostname, port, jarname);
return con.getInputStream();
}
}
catch (IOException e) {}
return null; // not found
}
/**
* Closes this class path.
*/
public void close() {}
/**
* Reads a class file on an http server.
*
* @param host host name
* @param port port number
* @param directory directory name ending with "/".
* It can be "/" (root directory).
* @param classname fully-qualified class name
*/
public static byte[] fetchClass(String host, int port,
String directory, String classname)
throws IOException
{
byte[] b;
URLConnection con = fetchClass0(host, port,
directory + classname.replace('.', '/') + ".class");
int size = con.getContentLength();
InputStream s = con.getInputStream();
if (size <= 0)
b = ClassPoolTail.readStream(s);
else {
b = new byte[size];
int len = 0;
do {
int n = s.read(b, len, size - len);
if (n < 0) {
s.close();
throw new IOException("the stream was closed: "
+ classname);
}
len += n;
} while (len < size);
}
s.close();
return b;
}
private static URLConnection fetchClass0(String host, int port,
String filename)
throws IOException
{
URL url;
try {
url = new URL("http", host, port, filename);
}
catch (MalformedURLException e) {
// should never reache here.
throw new IOException("invalid URL?");
}
URLConnection con = url.openConnection();
con.connect();
return con;
}
}
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