/**
 * Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
 *
 * 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.onebusaway.presentation.impl.conversion;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import com.opensymphony.xwork2.conversion.TypeConversionException;

/**
 * 
 */
public class DateConverter extends StrutsTypeConverter {

  private static SimpleDateFormat _format = new SimpleDateFormat("yyyy-MM-dd");

  @SuppressWarnings("rawtypes")
  public Object convertFromString(Map context, String[] values, Class toClass) {

    if (values != null && values.length > 0 && values[0] != null
        && values[0].length() > 0) {

      String value = values[0];

      if (value.matches("^(\\d+)$")) {
        long v = Long.parseLong(value);
        if( toClass == Long.TYPE || toClass == Long.class)
          return v;
        else
          return new Date(v);
      }

      try {
        Date d = _format.parse(value);
        if( toClass == Long.TYPE || toClass == Long.class)
          return d.getTime();
        return d;
      } catch (ParseException e) {
        e.printStackTrace();
        throw new TypeConversionException(e);
      }
    }
    return null;
  }

  @SuppressWarnings("rawtypes")
  public String convertToString(Map context, Object o) {
    if (o instanceof Date)
      return _format.format((Date) o);
    return "";
  }
}