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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.legacy.resolver.conflict;
20  
21  import javax.inject.Named;
22  import javax.inject.Singleton;
23  
24  import org.apache.maven.artifact.resolver.ResolutionNode;
25  import org.apache.maven.artifact.versioning.ArtifactVersion;
26  import org.apache.maven.artifact.versioning.OverConstrainedVersionException;
27  
28  /**
29   * Resolves conflicting artifacts by always selecting the <em>oldest</em> declaration. Oldest is defined as the
30   * declaration whose version is less according to <code>ArtifactVersion.compareTo</code>.
31   *
32   * @see ArtifactVersion#compareTo
33   * @since 3.0
34   */
35  @Named("oldest")
36  @Singleton
37  @Deprecated
38  public class OldestConflictResolver implements ConflictResolver {
39      // ConflictResolver methods -----------------------------------------------
40  
41      /*
42       * @see org.apache.maven.artifact.resolver.conflict.ConflictResolver#resolveConflict(org.apache.maven.artifact.resolver.ResolutionNode,
43       *      org.apache.maven.artifact.resolver.ResolutionNode)
44       */
45  
46      public ResolutionNode resolveConflict(ResolutionNode node1, ResolutionNode node2) {
47          try {
48              ArtifactVersion version1 = node1.getArtifact().getSelectedVersion();
49              ArtifactVersion version2 = node2.getArtifact().getSelectedVersion();
50  
51              return version1.compareTo(version2) <= 0 ? node1 : node2;
52          } catch (OverConstrainedVersionException exception) {
53              // TODO log message or throw exception?
54  
55              return null;
56          }
57      }
58  }