OrderByComparator.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a copy 5 * of this software and associated documentation files (the "Software"), to deal 6 * in the Software without restriction, including without limitation the rights 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 * copies of the Software, and to permit persons to whom the Software is 9 * furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 * SOFTWARE. 21 */ 22 23 package com.liferay.portal.kernel.util; 24 25 import java.io.Serializable; 26 27 import java.util.Comparator; 28 29 /** 30 * <a href="OrderByComparator.java.html"><b><i>View Source</i></b></a> 31 * 32 * @author Brian Wing Shun Chan 33 * 34 */ 35 public abstract class OrderByComparator implements Comparator, Serializable { 36 37 public abstract int compare(Object obj1, Object obj2); 38 39 public String getOrderBy() { 40 return null; 41 } 42 43 public String[] getOrderByFields() { 44 String orderBy = getOrderBy(); 45 46 if (orderBy == null) { 47 return null; 48 } 49 50 String[] parts = StringUtil.split(orderBy); 51 52 String[] fields = new String[parts.length]; 53 54 for (int i = 0; i < parts.length; i++) { 55 String part = parts[i]; 56 57 int x = part.indexOf(StringPool.PERIOD); 58 int y = part.indexOf(StringPool.SPACE, x); 59 60 if (y == -1) { 61 y = part.length(); 62 } 63 64 fields[i] = part.substring(x + 1, y); 65 } 66 67 return fields; 68 } 69 70 public boolean isAscending() { 71 String orderBy = getOrderBy(); 72 73 if ((orderBy == null) || orderBy.toUpperCase().endsWith(" DESC")) { 74 return false; 75 } 76 else { 77 return true; 78 } 79 } 80 81 public String toString() { 82 return getOrderBy(); 83 } 84 85 }