/*
 *   __               .__       .__  ._____.           
 * _/  |_  _______  __|__| ____ |  | |__\_ |__   ______
 * \   __\/  _ \  \/  /  |/ ___\|  | |  || __ \ /  ___/
 *  |  | (  <_> >    <|  \  \___|  |_|  || \_\ \\___ \ 
 *  |__|  \____/__/\_ \__|\___  >____/__||___  /____  >
 *                   \/       \/             \/     \/ 
 *
 * Copyright (c) 2006-2011 Karsten Schmidt
 * 
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * http://creativecommons.org/licenses/LGPL/2.1/
 * 
 * This library 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
 */

package toxi.data.feeds.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.GregorianCalendar;

import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;

//import com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl;

/**
 *
 * @author tux
 */
public class Rfc822DateAdapter  {

    /**
     *
     */
    public static final SimpleDateFormat[] RFC822_FORMATS = new SimpleDateFormat[] {
            new SimpleDateFormat("EEE, d MMM yy HH:mm:ss z"),
            new SimpleDateFormat("EEE, d MMM yy HH:mm z"),
            new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z"),
            new SimpleDateFormat("EEE, d MMM yyyy HH:mm z"),
            new SimpleDateFormat("d MMM yy HH:mm z"),
            new SimpleDateFormat("d MMM yy HH:mm:ss z"),
            new SimpleDateFormat("d MMM yyyy HH:mm z"),
            new SimpleDateFormat("d MMM yyyy HH:mm:ss z"), };

    /**
     *
     * @param date
     * @return
     * @throws Exception
     */
  
    public String marshal(XMLGregorianCalendar date) throws Exception {
        return RFC822_FORMATS[0].format(date);
    }

    /**
     *
     * @param dateString
     * @return
     * @throws Exception
     */
   
    public XMLGregorianCalendar unmarshal(String dateString) throws Exception {
        XMLGregorianCalendar calendar = null;
        GregorianCalendar cal = new GregorianCalendar();
        for (SimpleDateFormat f : RFC822_FORMATS) {
            try {
                Date d = f.parse(dateString);
                cal.setTime(d);
                DatatypeFactory dataType = DatatypeFactory.newInstance();
                calendar = dataType.newXMLGregorianCalendar(cal);
                break;
            } catch (ParseException e) {
            }
        }
        return calendar;
    }
}