1 package org.apache.maven.model.converter;
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.maven.model.Plugin;
23
24 import java.util.Comparator;
25
26 /**
27 * A comparator for <code>Plugin</code>s. It compares the plugins' groupIds and
28 * artifactIds.
29 *
30 * @author Dennis Lundberg
31 * @version $Id: PluginComparator.java 661727 2008-05-30 14:21:49Z bentmann $
32 */
33 public class PluginComparator
34 implements Comparator
35 {
36 public int compare( Object o1, Object o2 )
37 {
38 // Check for null objects
39 if ( o1 == null && o2 == null )
40 {
41 return 0;
42 }
43 if ( o1 == null )
44 {
45 return -1;
46 }
47 if ( o2 == null )
48 {
49 return 1;
50 }
51
52 // Check classes
53 if ( !( o1 instanceof Plugin ) && !( o2 instanceof Plugin ) )
54 {
55 return 0;
56 }
57 if ( !( o1 instanceof Plugin ) )
58 {
59 return -1;
60 }
61 if ( !( o2 instanceof Plugin ) )
62 {
63 return 1;
64 }
65 Plugin plugin1 = (Plugin) o1;
66 Plugin plugin2 = (Plugin) o2;
67
68 // Check for null values
69 if ( plugin1.getGroupId() == null && plugin2.getGroupId() == null )
70 {
71 return compareArtifactId( plugin1, plugin2 );
72 }
73 if ( plugin1.getGroupId() == null )
74 {
75 return -1;
76 }
77 if ( plugin2.getGroupId() == null )
78 {
79 return 1;
80 }
81
82 // Compare values
83 int answer;
84 answer = plugin1.getGroupId().compareTo( plugin2.getGroupId() );
85 if ( answer == 0 )
86 {
87 answer = compareArtifactId( plugin1, plugin2 );
88 }
89
90 return answer;
91 }
92
93 private int compareArtifactId( Plugin plugin1, Plugin plugin2 )
94 {
95 if ( plugin1.getArtifactId() == null && plugin2.getArtifactId() == null )
96 {
97 return 0;
98 }
99 if ( plugin1.getArtifactId() == null )
100 {
101 return -1;
102 }
103 if ( plugin2.getArtifactId() == null )
104 {
105 return 1;
106 }
107 return plugin1.getArtifactId().compareTo( plugin2.getArtifactId() );
108 }
109 }