org.dozer.converters.XMLGregorianCalendarConverter Maven / Gradle / Ivy

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Dozer is a powerful Java Bean to Java Bean mapper that recursively copies data from one object to another
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/*
 * Copyright 2005-2010 the original author or authors.
 *
 * 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 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.
 * 
 * Supported source data types include
 * 

 * java.util.Date
 * java.sql.Date
 * java.sql.Time
 * java.sql.Timestamp
 * java.util.Calendar
 * java.lang.String
 * any objects that return a number of milliseconds applicable to java.lang.Long format in their toString() form
 * 
 * 
 * 
 * Only intended for internal use.
 * 
 *
 * @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 RuntimeException(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);
  }
}