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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 com.rapiddweller.common.converter;

import com.rapiddweller.common.ConversionException;

import java.util.Date;
import java.util.TimeZone;

/**
 * Interprets a Date as duration specification, e.g. '0000-00-00T00:00:00.001' as one millisecond,
 * '0001-00-00T00:00:00.000' as one year. Dates after 1970-01-01 will be interpreted relative to that date.
 * Created at 11.01.2009 06:39:28
 *
 * @author Volker Bergmann
 * @since 0.5.7
 */
public class Date2DurationConverter extends ThreadSafeConverter {

  /**
   * Instantiates a new Date 2 duration converter.
   */
  public Date2DurationConverter() {
    super(Date.class, Long.class);
  }

  @Override
  public Long convert(Date sourceValue) throws ConversionException {
    if (sourceValue == null) {
      return null;
    }
    long source = sourceValue.getTime();
    // for time zone problems, see http://mail-archives.apache.org/mod_mbox/struts-user/200502.mbox/%[email protected]%3E
    Long result = source + TimeZone.getDefault().getOffset(0L); // That's relative to 1970-01-01
    if (result < 0) // if it's before 1970-01-01, interpret it relative to 0001-01-01
    {
      result = source + TimeZone.getDefault().getOffset(-62170156800000L) + 62170156800000L;
    }
    return result;
  }

}