/*

  * 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 java.io.Serializable;

 import java.util.Comparator;

 import org.displaytag.model.Cell;

 public class StringCellComparator implements Comparator, Serializable {

     static final long serialVersionUID = -183249045552328424L;

     /*

      * (non-Javadoc)

      * 

      * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)

      */

     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 StringValueComparator.getInstance().compare(s1, s2);

     }

 }