/*
 *  PHEX - The pure-java Gnutella-servent.
 *  Copyright (C) 2001 - 2005 Phex Development Group
 *
 *  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
 * 
 *  Created on 18.11.2005
 *  --- CVS Information ---
 *  $Id: PhexSAXHandler.java,v 1.1 2005/11/19 23:53:17 gregork Exp $
 */
package phex.xml.sax;

import java.io.CharArrayWriter;

import javax.xml.parsers.SAXParser;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import phex.xml.XJBPhex;
import phex.xml.impl.XJBGUISettingsImpl;
import phex.xml.impl.XJBSharedLibraryImpl;
import phex.xml.impl.XJBUpdateResponseImpl;

/**
 * 
 */
public class PhexSAXHandler extends DefaultHandler
{
    private static final String PHEX_ELEMENT = "phex";
    
    private CharArrayWriter text = new CharArrayWriter();
    private SAXParser parser;
    private XJBPhex xjbPhex;
    
    public PhexSAXHandler( XJBPhex xjbPhex, SAXParser parser )
    {
        this.xjbPhex = xjbPhex;
        this.parser = parser;
    }
    
    /**
     * Receive notification of the start of an element.
     *
     * @param name The element type name.
     * @param attributes The specified or defaulted attributes.
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     * @see org.xml.sax.ContentHandler#startElement
     */
    public void startElement( String uri, String localName, String qName,
        Attributes attributes)
        throws SAXException
    {
        text.reset();
        // this
        if ( PHEX_ELEMENT.equals( qName ) )
        {
            String phexVersion = attributes.getValue("phex-version");
            xjbPhex.setPhexVersion(phexVersion);
        }
        // childs
        else if ( qName.equals( "update-response" ) )
        {
            XJBUpdateResponseImpl xjbResponse = new XJBUpdateResponseImpl();
            xjbPhex.setUpdateResponse(xjbResponse);
            UpdateResponseHandler handler = new UpdateResponseHandler( 
                xjbResponse, attributes, this, parser );
            parser.getXMLReader().setContentHandler( handler );
        }
        else if ( qName.equals( "update-request" ) )
        {
            // we dont need to parse these... since we are only sending it.
            assert false : "We should not pare update-request";
        }
        else if ( qName.equals( SharedLibraryHandler.THIS_TAG_NAME ) )
        {
            XJBSharedLibraryImpl xjbLibrary = new XJBSharedLibraryImpl();
            xjbPhex.setSharedLibrary(xjbLibrary);
            SharedLibraryHandler handler = new SharedLibraryHandler( 
                xjbLibrary, attributes, this, parser );
            parser.getXMLReader().setContentHandler( handler );
        }
        else if ( qName.equals( GuiSettingsHandler.THIS_TAG_NAME ) )
        {
            XJBGUISettingsImpl xjbGui = new XJBGUISettingsImpl();
            xjbPhex.setGuiSettings(xjbGui);
            GuiSettingsHandler handler = new GuiSettingsHandler( 
                xjbGui, attributes, this, parser );
            parser.getXMLReader().setContentHandler( handler );
        }
        
        
        return;
    }
    
    public void endElement(String uri, String localName, String qName) 
        throws SAXException
    {
        return;
    }
     
     public InputSource resolveEntity(String publicId,
        String systemId)
     {
         return null; 
     }
     
     public void characters(char[] ch, int start, int length)
     {
         text.write( ch,start,length );
     }
}
