001    /*
002     * Copyright (c) 2006 Henri Sivonen
003     *
004     * Permission is hereby granted, free of charge, to any person obtaining a 
005     * copy of this software and associated documentation files (the "Software"), 
006     * to deal in the Software without restriction, including without limitation 
007     * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
008     * and/or sell copies of the Software, and to permit persons to whom the 
009     * Software is furnished to do so, subject to the following conditions:
010     *
011     * The above copyright notice and this permission notice shall be included in 
012     * all copies or substantial portions of the Software.
013     *
014     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
015     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
016     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
017     * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
018     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
019     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
020     * DEALINGS IN THE SOFTWARE.
021     */
022    
023    package org.whattf.checker.table;
024    
025    import java.util.Comparator;
026    
027    /**
028     * Compares cells using their <code>left</code> field. The cells can never be equal.
029     * 
030     * @version $Id: HorizontalCellComparator.java 169 2007-05-25 07:21:55Z hsivonen $
031     * @author hsivonen
032     */
033    final class HorizontalCellComparator implements Comparator<Cell> {
034    
035        public static final HorizontalCellComparator THE_INSTANCE = new HorizontalCellComparator();
036        
037        private HorizontalCellComparator() {
038            super();
039        }
040    
041        public final int compare(Cell cell0, Cell cell1) {
042            if (cell0.getLeft() < cell1.getLeft()) {
043                return -1;
044            } else if (cell0.getLeft() > cell1.getLeft()) {
045                return 1;
046            } else {
047                throw new IllegalStateException("Two cells in effect cannot start on the same column, so this should never happen!");
048            }
049        }
050    
051    }