View Javadoc
1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.maven.repository.metadata;
20  
21  import org.apache.maven.artifact.versioning.ArtifactVersion;
22  import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
23  import org.codehaus.plexus.component.annotations.Component;
24  import org.codehaus.plexus.component.annotations.Configuration;
25  
26  /**
27   * @author <a href="mailto:oleg@codehaus.org">Oleg Gusakov</a>
28   *
29   */
30  @Component(role = GraphConflictResolutionPolicy.class)
31  public class DefaultGraphConflictResolutionPolicy implements GraphConflictResolutionPolicy {
32      /**
33       * artifact, closer to the entry point, is selected
34       */
35      @Configuration(name = "closer-first", value = "true")
36      private boolean closerFirst = true;
37  
38      /**
39       * newer artifact is selected
40       */
41      @Configuration(name = "newer-first", value = "true")
42      private boolean newerFirst = true;
43  
44      public MetadataGraphEdge apply(MetadataGraphEdge e1, MetadataGraphEdge e2) {
45          int depth1 = e1.getDepth();
46          int depth2 = e2.getDepth();
47  
48          if (depth1 == depth2) {
49              ArtifactVersion v1 = new DefaultArtifactVersion(e1.getVersion());
50              ArtifactVersion v2 = new DefaultArtifactVersion(e2.getVersion());
51  
52              if (newerFirst) {
53                  return v1.compareTo(v2) > 0 ? e1 : e2;
54              }
55  
56              return v1.compareTo(v2) > 0 ? e2 : e1;
57          }
58  
59          if (closerFirst) {
60              return depth1 < depth2 ? e1 : e2;
61          }
62  
63          return depth1 < depth2 ? e2 : e1;
64      }
65  }