/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2001-2010 The eXist Project
 *  http://exist-db.org
 *
 *  This program 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
 *  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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  $Id$
 */

package org.exist.backup;

import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;

import org.exist.xquery.XPathException;
import org.exist.xquery.value.DateTimeValue;

import java.io.IOException;

import java.util.Date;
import java.util.Properties;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;


public abstract class AbstractBackupDescriptor implements BackupDescriptor
{
    protected Date date;

    public Date getDate()
    {
        if( date == null ) {

            try {
                final Properties properties = getProperties();
                final String     dateStr    = properties.getProperty( "date" );

                if( dateStr != null ) {
                    final DateTimeValue dtv = new DateTimeValue( dateStr );
                    date = dtv.getDate();
                }
            }
            catch( final IOException | XPathException e ) {
            }

            if( date == null ) {

                // catch unexpected issues by setting the backup time as early as possible
                date = new Date( 0 );
            }
        }
        return( date );
    }


    public boolean before( long timestamp )
    {
        return( timestamp > getDate().getTime() );
    }


    public void parse( ContentHandler handler ) throws IOException, SAXException, ParserConfigurationException
    {
        final SAXParserFactory saxFactory = SAXParserFactory.newInstance();
        saxFactory.setNamespaceAware( true );
        saxFactory.setValidating( false );
        final SAXParser sax    = saxFactory.newSAXParser();
        final XMLReader reader = sax.getXMLReader();
        reader.setContentHandler( handler );
        reader.parse( getInputSource() );
    }
}