001 package org.apache.archiva.admin.repository.proxyconnector; 002 /* 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, 014 * software distributed under the License is distributed on an 015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 016 * KIND, either express or implied. See the License for the 017 * specific language governing permissions and limitations 018 * under the License. 019 */ 020 021 import org.apache.archiva.admin.model.beans.ProxyConnector; 022 023 import java.util.Comparator; 024 025 /** 026 * @author Olivier Lamy 027 * @since 1.4-M3 028 */ 029 public class ProxyConnectorOrderComparator 030 implements Comparator<ProxyConnector> 031 { 032 private static ProxyConnectorOrderComparator INSTANCE = new ProxyConnectorOrderComparator(); 033 034 public int compare( ProxyConnector o1, ProxyConnector o2 ) 035 { 036 if ( o1 == null && o2 == null ) 037 { 038 return 0; 039 } 040 041 // Ensure null goes to end of list. 042 if ( o1 == null && o2 != null ) 043 { 044 return 1; 045 } 046 047 if ( o1 != null && o2 == null ) 048 { 049 return -1; 050 } 051 052 // Ensure 0 (unordered) goes to end of list. 053 if ( o1.getOrder() == 0 && o2.getOrder() != 0 ) 054 { 055 return 1; 056 } 057 058 if ( o1.getOrder() != 0 && o2.getOrder() == 0 ) 059 { 060 return -1; 061 } 062 063 return o1.getOrder() - o2.getOrder(); 064 } 065 066 public static ProxyConnectorOrderComparator getInstance() 067 { 068 return INSTANCE; 069 } 070 }