/*
    *  Copyright 2010, 2011 Chris Pheby
    *
    *  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.jadira.bindings.core.jdk;
  
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.TimeZone;
  
  import org.jadira.bindings.core.api.Binding;
  
  /**
   * Binds a Date to a String. Date String binding always uses the GMT zone to render.... if you 
   * want control over the zone, use CalendarStringBinding instead or better still use JodaTime or JSR310.
   */
  public class DateStringBinding extends AbstractStringBinding<Date> implements Binding<Date, String> {
  
      private static final ThreadLocal<SimpleDateFormat> DATE_FORMAT = new ThreadLocal<SimpleDateFormat>() {
          @Override
          public SimpleDateFormat initialValue() {
              final SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
              formatter.setTimeZone(TimeZone.getTimeZone("GMT"));
              return formatter;
          }
      };
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Date unmarshal(String object) {
  
          if (object.length() != 29) {
              throw new IllegalArgumentException("Invalid date: " + object);
          }
          final String result = object.substring(0, 26) + object.substring(27);
  
          try {
              return DATE_FORMAT.get().parse(result);
          } catch (ParseException ex) {
              throw new IllegalArgumentException("Invalid date: " + object);
          }
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String marshal(Date object) {
  
          String output = DATE_FORMAT.get().format(object);
          return output.substring(0, 26) + ":" + output.substring(26);
      }
  
      /**
       * {@inheritDoc}
       */
      /* @Override */
  	public Class<Date> getBoundClass() {
  		return Date.class;
  	}
  }