/**

  * Copyright 2005-2013 Dozer Project

  *

  * 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.dozer.converters;

 import org.apache.commons.beanutils.Converter;

 import org.dozer.MappingException;

 import javax.xml.datatype.DatatypeConfigurationException;

 import javax.xml.datatype.DatatypeFactory;

 import javax.xml.datatype.XMLGregorianCalendar;

 import java.text.DateFormat;

 import java.text.ParseException;

 import java.util.Calendar;

 import java.util.Date;

 import java.util.GregorianCalendar;

 /**

  * Internal class for converting Supported Data Types --> XMLGregorianCalendar.

  * <p>

  * Supported source data types include

  * <ul>

  * <li>java.util.Date</li>

  * <li>java.sql.Date</li>

  * <li>java.sql.Time</li>

  * <li>java.sql.Timestamp</li>

  * <li>java.util.Calendar</li>

  * <li>java.lang.String</li>

  * <li>any objects that return a number of milliseconds applicable to java.lang.Long format in their toString() form</li>

  * </ul>

  * </p>

  * <p/>

  * Only intended for internal use.

  * <p/>

  *

  * @author pnyheim

  * @author dmitry.buzdin

  */

 public class XMLGregorianCalendarConverter implements Converter {

   private DateFormat dateFormat;

   public XMLGregorianCalendarConverter(DateFormat dateFormat) {

     this.dateFormat = dateFormat;

   }

   /**

    * Cache the DatatypeFactory because newInstance is very expensive.

    */

   private static DatatypeFactory dataTypeFactory;

   /**

    * Returns a new instance of DatatypeFactory, or the cached one if previously created.

    *

    * @return instance of DatatypeFactory

    */

   private static DatatypeFactory dataTypeFactory() {

     if (dataTypeFactory == null) {

       try {

         dataTypeFactory = DatatypeFactory.newInstance();

       } catch (DatatypeConfigurationException e) {

         throw new MappingException(e);

       }

     }

     return dataTypeFactory;

   }

   /**

    * {@inheritDoc}

    */

   public Object convert(Class destClass, Object srcObj) {

     Class sourceClass = srcObj.getClass();

     Calendar result = new GregorianCalendar();

     if (java.util.Date.class.isAssignableFrom(sourceClass)) {

       // Date --> XMLGregorianCalendar

       result.setTime((java.util.Date) srcObj);

     } else if (Calendar.class.isAssignableFrom(sourceClass)) {

       // Calendar --> XMLGregorianCalendar

       Calendar c = (Calendar) srcObj;

       result.setTime(c.getTime());

       result.setTimeZone(c.getTimeZone());

     } else if (XMLGregorianCalendar.class.isAssignableFrom(sourceClass)) {

       result = ((XMLGregorianCalendar) srcObj).toGregorianCalendar();

     } else if (dateFormat != null && String.class.isAssignableFrom(sourceClass)) {

       if ("".equals(srcObj)) {

         return null;

       }

       try {

         long time = dateFormat.parse((String) srcObj).getTime();

         result.setTime(new Date(time));

       } catch (ParseException e) {

         throw new ConversionException("Unable to parse source object using specified date format", e);

       }

     } else {

       try {

         long time = Long.parseLong(srcObj.toString());

         result.setTime(new Date(time));

       } catch (NumberFormatException e) {

         throw new ConversionException("Unable to determine time in millis of source object", e);

       }

     }

     return dataTypeFactory().newXMLGregorianCalendar((GregorianCalendar) result);

   }

 }