1 package org.apache.archiva.proxy;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.apache.archiva.proxy.model.ProxyConnector;
23
24 import java.util.Comparator;
25
26 /**
27 * ProxyConnectorOrderComparator
28 *
29 *
30 */
31 public class ProxyConnectorOrderComparator
32 implements Comparator<ProxyConnector>
33 {
34 private static ProxyConnectorOrderComparatorr.html#ProxyConnectorOrderComparator">ProxyConnectorOrderComparator INSTANCE = new ProxyConnectorOrderComparator();
35
36 public static ProxyConnectorOrderComparator getInstance()
37 {
38 return INSTANCE;
39 }
40
41 @Override
42 public int compare( ProxyConnector o1, ProxyConnector o2 )
43 {
44 if ( o1 == null && o2 == null )
45 {
46 return 0;
47 }
48
49 // Ensure null goes to end of list.
50 if ( o1 == null && o2 != null )
51 {
52 return 1;
53 }
54
55 if ( o1 != null && o2 == null )
56 {
57 return -1;
58 }
59
60 // Ensure 0 (unordered) goes to end of list.
61 if ( o1.getOrder() == 0 && o2.getOrder() != 0 )
62 {
63 return 1;
64 }
65
66 if ( o1.getOrder() != 0 && o2.getOrder() == 0 )
67 {
68 return -1;
69 }
70
71 return o1.getOrder() - o2.getOrder();
72 }
73 }