source: trunk/jabberit_messenger/java_source/src/nu/fw/jeti/util/JIDPrep.java @ 1001

/* 
 *      Jeti, a Java Jabber client, Copyright (C) 2007 E.S. de Boer  
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *      For questions, comments etc, 
 *      use the website at http://jeti.jabberstudio.org
 */

//created on May 7, 2007
package nu.fw.jeti.util;

import java.io.IOException;
import java.io.InputStream;
import java.net.IDN;

import sun.net.idn.StringPrep;
import sun.text.normalizer.UCharacterIterator;

/**
 * stringprep JIDs See rfc3920 - 3.2 / 3.4
 *
 */
public class JIDPrep {

        private static StringPrep nodePrep;
        private static StringPrep resourcePrep;
            
    static {
        InputStream stream = null;
        
        try {
            stream = JIDPrep.class.getResourceAsStream("nodeprep.spp");
            nodePrep = new StringPrep(stream);
            stream.close();
            stream = JIDPrep.class.getResourceAsStream("resourceprep.spp");
            resourcePrep = new StringPrep(stream);
            stream.close();
        } catch (IOException e) {
            // should never reach here
                e.printStackTrace();
            assert false;
        }
    }
        
        
        
        /**
         * Nameprep the server/domain part of a JID
         * @param server
         * @return namepreped server part
         * @throws a IllegalArgumentException if it is an illegal domain
         */
        public static String namePrep(String server)
        {
                return IDN.toASCII(server, IDN.USE_STD3_ASCII_RULES);
        }
        
        /**
         * Nodeprep the node part of a JID
         * @param node
         * @return nodepreped part of a JID
         * @throws a IllegalArgumentException if it is an illegal Node
         */
        public static String nodePrep(String node)
        {
                //TODO add http://www.icu-project.org/icu4j_faq.html for java 1.4 compatibility and non sun java
                if(node == null) return null;
                UCharacterIterator iter = UCharacterIterator.getInstance(node);
        try {
            return nodePrep.prepare(iter, IDN.USE_STD3_ASCII_RULES).toString();
        } catch (java.text.ParseException e) {
            throw new IllegalArgumentException(e);
        }
        }
        
        
        /**
         * Resourceprep the node part of a JID
         * @param resource
         * @return resourcepreped part of a JID
         * @throws a IllegalArgumentException if it is an illegal Resource
         */
        public static String resourcePrep(String resource)
        {
                if(resource == null) return null;
                UCharacterIterator iter = UCharacterIterator.getInstance(resource);
        try {
            return resourcePrep.prepare(iter, IDN.USE_STD3_ASCII_RULES).toString();
        } catch (java.text.ParseException e) {
            throw new IllegalArgumentException(e);
        }
        }
        
}