DateConverter.java

/*
 * Copyright 2013, 2014, 2015 EnergyOS.org
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package org.energyos.espi.common.utils;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

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

import org.energyos.espi.common.models.atom.DateTimeType;
import org.joda.time.DateTime;

public class DateConverter {
	public static DateTimeType toDateTimeType(Date date) {
		DateTimeType dateTimeType = new DateTimeType();
		GregorianCalendar gregorianCalendar = new DateTime(date)
				.toGregorianCalendar();
		gregorianCalendar.setTimeZone(TimeZone.getTimeZone("UTC"));
		DatatypeFactory datatypeFactory;

		try {
			datatypeFactory = DatatypeFactory.newInstance();
		} catch (DatatypeConfigurationException e) {
			throw new RuntimeException(e);
		}

		XMLGregorianCalendar xmlGregorianCalendar = datatypeFactory
				.newXMLGregorianCalendar(gregorianCalendar);
		xmlGregorianCalendar.setFractionalSecond(null);
		dateTimeType.setValue(xmlGregorianCalendar);

		return dateTimeType;
	}

	public static DateTimeType toDateTimeType(
			GregorianCalendar gregorianCalendar) {
		DateTimeType dateTimeType = new DateTimeType();
		DatatypeFactory datatypeFactory;
		if (gregorianCalendar == null) {
			gregorianCalendar = new GregorianCalendar();
		}

		try {
			datatypeFactory = DatatypeFactory.newInstance();
		} catch (DatatypeConfigurationException e) {
			throw new RuntimeException(e);
		}

		XMLGregorianCalendar xmlGregorianCalendar = datatypeFactory
				.newXMLGregorianCalendar(gregorianCalendar);
		xmlGregorianCalendar.setFractionalSecond(null);
		dateTimeType.setValue(xmlGregorianCalendar);

		return dateTimeType;
	}

	public static Calendar epoch() {
		Calendar epoch = Calendar.getInstance();
		epoch.setTimeInMillis(0L);
		return epoch;
	}
}