001    /**
002     * Copyright 2005-2011 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.kns.web.comparator;
017    
018    import org.displaytag.model.Cell;
019    import org.kuali.rice.krad.comparator.NumericValueComparator;
020    
021    import java.io.Serializable;
022    import java.util.Comparator;
023    
024    public class NumericCellComparator implements Comparator, Serializable {
025    
026        static final long serialVersionUID = 3449202365486147519L;
027    
028        public int compare(Object o1, Object o2) {
029    
030            // null guard. non-null value is greater. equal if both are null
031            if (null == o1 || null == o2) {
032                return (null == o1 && null == o2) ? 0 : ((null == o1) ? -1 : 1);
033            }
034    
035            String numericCompare1 = CellComparatorHelper.getSanitizedStaticValue((Cell) o1);
036            String numericCompare2 = CellComparatorHelper.getSanitizedStaticValue((Cell) o2);
037    
038            return NumericValueComparator.getInstance().compare(numericCompare1, numericCompare2);
039        }
040    
041    }