// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at 
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses. 
// ========================================================================
package net.hasor.utils.json;
import java.text.DateFormatSymbols;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.util.logging.Logger;
/* ------------------------------------------------------------ */

/**
 * Convert a {@link Date} to JSON.
 * If fromJSON is true in the constructor, the JSON generated will
 * be of the form {class="java.util.Date",value="1/1/1970 12:00 GMT"}
 * If fromJSON is false, then only the string value of the date is generated.
 */
public class JSONDateConvertor implements JSON.Convertor {
    protected final static Logger  logger = Logger.getLogger(JSONDateConvertor.class.getName());
    private                boolean _fromJSON;
    DateCache        _dateCache;
    SimpleDateFormat _format;

    public JSONDateConvertor() {
        this(false);
    }

    public JSONDateConvertor(boolean fromJSON) {
        this(DateCache.DEFAULT_FORMAT, TimeZone.getTimeZone("GMT"), fromJSON);
    }

    public JSONDateConvertor(String format, TimeZone zone, boolean fromJSON) {
        _dateCache = new DateCache(format);
        _dateCache.setTimeZone(zone);
        _fromJSON = fromJSON;
        _format = new SimpleDateFormat(format);
        _format.setTimeZone(zone);
    }

    public JSONDateConvertor(String format, TimeZone zone, boolean fromJSON, Locale locale) {
        _dateCache = new DateCache(format, locale);
        _dateCache.setTimeZone(zone);
        _fromJSON = fromJSON;
        _format = new SimpleDateFormat(format, new DateFormatSymbols(locale));
        _format.setTimeZone(zone);
    }

    public Object fromJSON(Map map) {
        if (!_fromJSON)
            throw new UnsupportedOperationException();
        try {
            synchronized (_format) {
                return _format.parseObject((String) map.get("value"));
            }
        } catch (Exception e) {
            logger.warning(e.getMessage());
        }
        return null;
    }

    public void toJSON(Object obj, JSON.Output out) {
        String date = _dateCache.format((Date) obj);
        if (_fromJSON) {
            out.addClass(obj.getClass());
            out.add("value", date);
        } else {
            out.add(date);
        }
    }
}
