OrderByComparator.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * The contents of this file are subject to the terms of the Liferay Enterprise 5 * Subscription License ("License"). You may not use this file except in 6 * compliance with the License. You can obtain a copy of the License by 7 * contacting Liferay, Inc. See the License for the specific language governing 8 * permissions and limitations under the License, including but not limited to 9 * distribution rights of the Software. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 12 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 13 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 14 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 15 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 17 * SOFTWARE. 18 */ 19 20 package com.liferay.portal.kernel.util; 21 22 import java.io.Serializable; 23 24 import java.util.Comparator; 25 26 /** 27 * <a href="OrderByComparator.java.html"><b><i>View Source</i></b></a> 28 * 29 * @author Brian Wing Shun Chan 30 * 31 */ 32 public abstract class OrderByComparator implements Comparator, Serializable { 33 34 public abstract int compare(Object obj1, Object obj2); 35 36 public String getOrderBy() { 37 return null; 38 } 39 40 public String[] getOrderByFields() { 41 String orderBy = getOrderBy(); 42 43 if (orderBy == null) { 44 return null; 45 } 46 47 String[] parts = StringUtil.split(orderBy); 48 49 String[] fields = new String[parts.length]; 50 51 for (int i = 0; i < parts.length; i++) { 52 String part = parts[i]; 53 54 int x = part.indexOf(StringPool.PERIOD); 55 int y = part.indexOf(StringPool.SPACE, x); 56 57 if (y == -1) { 58 y = part.length(); 59 } 60 61 fields[i] = part.substring(x + 1, y); 62 } 63 64 return fields; 65 } 66 67 public boolean isAscending() { 68 String orderBy = getOrderBy(); 69 70 if ((orderBy == null) || orderBy.toUpperCase().endsWith(" DESC")) { 71 return false; 72 } 73 else { 74 return true; 75 } 76 } 77 78 public String toString() { 79 return getOrderBy(); 80 } 81 82 }