/**
 * This work was created by participants in the DataONE project, and is
 * jointly copyrighted by participating institutions in DataONE. For 
 * more information on DataONE, see our web site at http://dataone.org.
 *
 *   Copyright ${year}
 *
 * 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.
 * 
 * $Id$
 */

package org.dataone.cn.indexer.convert;

/**
 * Basic value check for longitude, assumed to be decimal degrees.
 * 
 * @author vieglais
 * 
 */
public class SolrLongitudeConverter implements IConverter {

  /**
   * Given a string representation of a potential longitude value, ensure it is
   * a valid floating point number and check the range.
   * 
   * TODO: add converters for different representations if necessary, such as 
   *       d m s
   * 
   * @param data
   *          The value to convert
   * 
   * @return String that is a valid representation of longitude, in the range
   *         -180.0 - 180.0
   */
  public String convert(String data) {
    double v = 0.0d;
    try {
      v = Double.parseDouble(data.trim());
      if (v < -180.0d) {
        throw new NumberFormatException("Longitude < -180.0");
      }
      if (v > 360.0d) {
        throw new NumberFormatException("Latitude > 360.0");
      }
      if (v > 180.0d) {
        v = 360.0d - v;
      }
    } catch (NumberFormatException e) {
      return null;
    }
    return Double.toString(v);
  }
}