/* RsyncProtocolHandler.java * * $Id: Handler.java 3766 2005-08-17 23:36:54Z stack-sf $ * * Created Jul 15, 2005 * * Copyright (C) 2005 Internet Archive. * * This file is part of the Heritrix web crawler (crawler.archive.org). * * Heritrix is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * any later version. * * Heritrix 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 Public License for more details. * * You should have received a copy of the GNU Lesser Public License * along with Heritrix; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */package org.archive.net.rsync;import java.io.IOException;import java.io.InputStream;import java.net.URL;import java.net.URLConnection;import java.net.URLStreamHandler;/** * A protocol handler that uses native rsync client to do copy. * You need to define the system property * <code>-Djava.protocol.handler.pkgs=org.archive.net</code> to add this handler * to the java.net.URL set.  Assumes rsync is in path.  Define * system property * <code>-Dorg.archive.net.rsync.RsyncUrlConnection.path=PATH_TO_RSYNC</code> to * pass path to rsync. Downloads to <code>java.io.tmpdir</code>. * @author stack */public class Handler extends URLStreamHandler {    protected URLConnection openConnection(URL u) {        return new RsyncURLConnection(u);    }    /**     * Main dumps rsync file to STDOUT.     * @param args     * @throws IOException     */    public static void main(String[] args)    throws IOException {        if (args.length != 1) {            System.out.println("Usage: java java " +                "-Djava.protocol.handler.pkgs=org.archive.net " +                "org.archive.net.rsync.Handler RSYNC_URL");            System.exit(1);        }        URL u = new URL(args[0]);        URLConnection connect = u.openConnection();        // Write download to stdout.        final int bufferlength = 4096;        byte [] buffer = new byte [bufferlength];        InputStream is = connect.getInputStream();        try {            for (int count = is.read(buffer, 0, bufferlength);                    (count = is.read(buffer, 0, bufferlength)) != -1;) {                System.out.write(buffer, 0, count);            }            System.out.flush();        } finally {            is.close();        }    }}