/*
 *  PHEX - The pure-java Gnutella-servent.
 *  Copyright (C) 2001 - 2007 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 14.12.2005
 *  --- CVS Information ---
 *  $Id: FileSizeConditionHandler.java 3891 2007-08-30 16:43:43Z gregork $
 */
package phex.xml.sax.parser.rules;

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.common.log.NLogger;
import phex.rules.condition.FileSizeCondition;
import phex.xml.sax.rules.DFileSizeCondition;

public class FileSizeConditionHandler extends DefaultHandler
{
    public static final String ELEMENT_NAME = DFileSizeCondition.ELEMENT_NAME;

    private CharArrayWriter text = new CharArrayWriter();

    private SAXParser parser;

    private DFileSizeCondition condition;

    private DefaultHandler parent;

    public FileSizeConditionHandler( DFileSizeCondition condition, Attributes attributes,
        DefaultHandler parent, SAXParser parser )
    {
        this.condition = condition;
        this.parser = parser;
        this.parent = parent;
    }

    /**
     * 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();
        if ( qName.equals( "range" ) )
        {
            long min = -1;
            long max = -1;
            
            String minStr = attributes.getValue("min");
            String maxStr = attributes.getValue("max");
            try
            {
                min = Long.parseLong( minStr );
            }
            catch (NumberFormatException exp)
            {
                NLogger.error( FileSizeConditionHandler.class, exp, exp );
            }
            try
            {
                max = Long.parseLong( maxStr );
            }
            catch (NumberFormatException exp)
            {
                NLogger.error( FileSizeConditionHandler.class, exp, exp );
            }
            
            if ( min >= 0 || max >= 0 )
            {
                FileSizeCondition.Range range = new FileSizeCondition.Range( min,
                    max );
                condition.getRanges().add( range );
            }
        }
        return;
    }

    public void endElement( String uri, String localName, String qName )
        throws SAXException
    {
        if ( qName.equals( ELEMENT_NAME ) )
        {
            parser.getXMLReader().setContentHandler( parent );
        }
    }

    public InputSource resolveEntity( String publicId, String systemId )
    {
        return null;
    }

    public void characters( char[] ch, int start, int length )
    {
        text.write( ch, start, length );
    }
}
