/*
 * Copyright 2013 Robert von Burg <eitch@eitchnet.ch>
 * 
 * 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 li.strolch.model.xml;

import java.util.Calendar;
import java.util.Date;

import javax.xml.bind.DatatypeConverter;
import javax.xml.bind.annotation.adapters.XmlAdapter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import li.strolch.utils.helper.StringHelper;

public class Iso8601DateAdapter extends XmlAdapter<String, Date> {

	private static final Logger logger = LoggerFactory.getLogger(Iso8601DateAdapter.class);

	@Override
	public Date unmarshal(String value) throws Exception {
		if (StringHelper.isEmpty(value))
			return null;
		try {
			return DatatypeConverter.parseDateTime(value).getTime();
		} catch (Exception e) {
			IllegalArgumentException ex = new IllegalArgumentException("Failed to parse value: " + value, e);
			logger.info(ex.getMessage(), ex);
			throw ex;
		}
	}

	@Override
	public String marshal(Date value) throws Exception {
		if (value == null)
			return null;
		try {
			Calendar cal = Calendar.getInstance();
			cal.setTime(value);
			String valueS = DatatypeConverter.printDateTime(cal);
			return valueS;
		} catch (Exception e) {
			IllegalArgumentException ex = new IllegalArgumentException("Failed to format date: " + value, e);
			logger.info(ex.getMessage(), ex);
			throw ex;
		}
	}
}