TimestampConverter.java

/*******************************************************************************
 *   Gisgraphy Project 
 * 
 *   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.
 * 
 *   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
 * 
 *  Copyright 2008  Gisgraphy project 
 *  David Masclet <davidmasclet@gisgraphy.com>
 *  
 *  
 *******************************************************************************/
package com.gisgraphy.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.lang.StringUtils;

/**
 * This class is converts a java.util.Date to a String and a String to a
 * java.util.Date for use as a Timestamp. It is used by BeanUtils when copying
 * properties.
 * 
 * @author <a href="mailto:dan@getrolling.com">Dan Kibler</a>
 */
public class TimestampConverter extends DateConverter {
    /**
     * i18n-ized timestamp format - based on values in
     * ApplicationResources.properties
     */
    public static final String TS_FORMAT = DateUtil.getDatePattern()
	    + " HH:mm:ss.S";

    /**
     * Convert a String to a date
     * 
     * @param type
     *                java.util.Date
     * @param value
     *                the String value
     * @return a converted date
     */
    @SuppressWarnings("unchecked")
    protected Object convertToDate(Class type, Object value) {
	DateFormat df = new SimpleDateFormat(TS_FORMAT);
	if (value instanceof String) {
	    try {
		if (StringUtils.isEmpty(value.toString())) {
		    return null;
		}

		return df.parse((String) value);
	    } catch (Exception pe) {
		throw new ConversionException(
			"Error converting String to Timestamp");
	    }
	}

	throw new ConversionException("Could not convert "
		+ value.getClass().getName() + " to " + type.getName());
    }

    /**
     * Convert from a java.util.Date to a String
     * 
     * @param type
     *                java.lang.String
     * @param value
     *                the date instance
     * @return string version of date using default date pattern
     */
    @SuppressWarnings("unchecked")
    @Override
    protected Object convertToString(Class type, Object value) {
	DateFormat df = new SimpleDateFormat(TS_FORMAT);
	if (value instanceof Date) {
	    try {
		return df.format(value);
	    } catch (Exception e) {
		throw new ConversionException(
			"Error converting Timestamp to String");
	    }
	}

	return value.toString();
    }
}