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1   package org.apache.maven.repository.metadata;
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.versioning.ArtifactVersion;
23  import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
24  import org.codehaus.plexus.component.annotations.Component;
25  import org.codehaus.plexus.component.annotations.Configuration;
26  
27  /**
28   * @author <a href="mailto:oleg@codehaus.org">Oleg Gusakov</a>
29   *
30   */
31  @Component( role = GraphConflictResolutionPolicy.class )
32  public class DefaultGraphConflictResolutionPolicy
33      implements GraphConflictResolutionPolicy
34  {
35      /**
36       * artifact, closer to the entry point, is selected
37       */
38      @Configuration( name = "closer-first", value = "true" )
39      private boolean closerFirst = true;
40  
41      /**
42       * newer artifact is selected
43       */
44      @Configuration( name = "newer-first", value = "true" )
45      private boolean newerFirst = true;
46  
47      public MetadataGraphEdge apply( MetadataGraphEdge e1, MetadataGraphEdge e2 )
48      {
49          int depth1 = e1.getDepth();
50          int depth2 = e2.getDepth();
51  
52          if ( depth1 == depth2 )
53          {
54              ArtifactVersion v1 = new DefaultArtifactVersion( e1.getVersion() );
55              ArtifactVersion v2 = new DefaultArtifactVersion( e2.getVersion() );
56  
57              if ( newerFirst )
58              {
59                  return v1.compareTo( v2 ) > 0 ? e1 : e2;
60              }
61  
62              return v1.compareTo( v2 ) > 0 ? e2 : e1;
63          }
64  
65          if ( closerFirst )
66          {
67              return depth1 < depth2 ? e1 : e2;
68          }
69  
70          return depth1 < depth2 ? e2 : e1;
71      }
72  
73  }