1 package org.apache.archiva.admin.model.proxyconnector; 2 /* 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 */ 20 21 import org.apache.archiva.admin.model.beans.ProxyConnector; 22 23 import java.util.Comparator; 24 25 /** 26 * @author Olivier Lamy 27 * @since 1.4-M1 28 */ 29 public class ProxyConnectorOrderComparator 30 implements Comparator<ProxyConnector> 31 { 32 private static ProxyConnectorOrderComparator INSTANCE = new ProxyConnectorOrderComparator(); 33 34 @Override 35 public int compare( ProxyConnector o1, ProxyConnector o2 ) 36 { 37 if ( o1 == null && o2 == null ) 38 { 39 return 0; 40 } 41 42 // Ensure null goes to end of list. 43 if ( o1 == null && o2 != null ) 44 { 45 return 1; 46 } 47 48 if ( o1 != null && o2 == null ) 49 { 50 return -1; 51 } 52 53 // Ensure 0 (unordered) goes to end of list. 54 if ( o1.getOrder() == 0 && o2.getOrder() != 0 ) 55 { 56 return 1; 57 } 58 59 if ( o1.getOrder() != 0 && o2.getOrder() == 0 ) 60 { 61 return -1; 62 } 63 64 return o1.getOrder() - o2.getOrder(); 65 } 66 67 public static ProxyConnectorOrderComparator getInstance() 68 { 69 return INSTANCE; 70 } 71 }