/*

  * 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 java.io.Serializable;

 import java.util.Comparator;

 public class BooleanCellComparator implements Comparator, Serializable {

     static final long serialVersionUID = 1525781435762831055L;

     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);

         int compared = 0;

         Boolean b1 = Boolean.valueOf(s1);

         Boolean b2 = Boolean.valueOf(s2);

         if (!b1.equals(b2)) {

             if (b1.equals(Boolean.FALSE)) {

                 compared = -1;

             }

             else {

                 compared = 1;

             }

         }

         return compared;

     }

 }