1 package org.apache.maven.repository.legacy.resolver.conflict;
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.artifact.resolver.ResolutionNode;
23 import org.apache.maven.artifact.versioning.ArtifactVersion;
24 import org.apache.maven.artifact.versioning.OverConstrainedVersionException;
25 import org.codehaus.plexus.component.annotations.Component;
26
27 /**
28 * Resolves conflicting artifacts by always selecting the <em>oldest</em> declaration. Oldest is defined as the
29 * declaration whose version is less according to <code>ArtifactVersion.compareTo</code>.
30 *
31 * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
32 * @version $Id: OldestConflictResolver.java 958295 2010-06-26 23:16:18Z hboutemy $
33 * @see ArtifactVersion#compareTo(Object)
34 * @since 3.0
35 */
36 @Component( role = ConflictResolver.class, hint = "oldest" )
37 public class OldestConflictResolver
38 implements ConflictResolver
39 {
40 // ConflictResolver methods -----------------------------------------------
41
42 /*
43 * @see org.apache.maven.artifact.resolver.conflict.ConflictResolver#resolveConflict(org.apache.maven.artifact.resolver.ResolutionNode,
44 * org.apache.maven.artifact.resolver.ResolutionNode)
45 */
46
47 public ResolutionNode resolveConflict( ResolutionNode node1, ResolutionNode node2 )
48 {
49 try
50 {
51 ArtifactVersion version1 = node1.getArtifact().getSelectedVersion();
52 ArtifactVersion version2 = node2.getArtifact().getSelectedVersion();
53
54 return version1.compareTo( version2 ) <= 0 ? node1 : node2;
55 }
56 catch ( OverConstrainedVersionException exception )
57 {
58 // TODO: log message or throw exception?
59
60 return null;
61 }
62 }
63 }