001 package org.apache.archiva.proxy; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022 import org.apache.archiva.proxy.model.ProxyConnector; 023 024 import java.util.Comparator; 025 026 /** 027 * ProxyConnectorOrderComparator 028 * 029 * 030 */ 031 public class ProxyConnectorOrderComparator 032 implements Comparator<ProxyConnector> 033 { 034 private static ProxyConnectorOrderComparator INSTANCE = new ProxyConnectorOrderComparator(); 035 036 public static ProxyConnectorOrderComparator getInstance() 037 { 038 return INSTANCE; 039 } 040 041 public int compare( ProxyConnector o1, ProxyConnector o2 ) 042 { 043 if ( o1 == null && o2 == null ) 044 { 045 return 0; 046 } 047 048 // Ensure null goes to end of list. 049 if ( o1 == null && o2 != null ) 050 { 051 return 1; 052 } 053 054 if ( o1 != null && o2 == null ) 055 { 056 return -1; 057 } 058 059 // Ensure 0 (unordered) goes to end of list. 060 if ( o1.getOrder() == 0 && o2.getOrder() != 0 ) 061 { 062 return 1; 063 } 064 065 if ( o1.getOrder() != 0 && o2.getOrder() == 0 ) 066 { 067 return -1; 068 } 069 070 return o1.getOrder() - o2.getOrder(); 071 } 072 }