/*
    * Copyright 2006-2008 The Kuali Foundation
    * 
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    * 
   * 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.kuali.rice.kns.web.comparator;
  
  import org.displaytag.model.Cell;
  import org.kuali.rice.krad.comparator.TemporalValueComparator;
  
  import java.io.Serializable;
  import java.util.Comparator;
  
  public class TemporalCellComparator implements Comparator, Serializable {
  
      static final long serialVersionUID = 6587335959291216641L;
  
      public TemporalCellComparator() {
          super();
      }
  
      public int compare(Object o1, Object o2) {
  
          // null guard. non-null value is greater. equal if both are null
          if (null == o1 || null == o2) {
              return null == o1 && null == o2 ? 0 : null == o1 ? -1 : 1;
          }
  
          String s1 = CellComparatorHelper.getSanitizedStaticValue((Cell) o1);
          String s2 = CellComparatorHelper.getSanitizedStaticValue((Cell) o2);
  
          return TemporalValueComparator.getInstance().compare(s1, s2);
      }
  
  }