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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  
24  /**
25   * Determines which version of an artifact to use when there are conflicting declarations.
26   *
27   * @author <a href="mailto:jason@maven.org">Jason van Zyl</a>
28   * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
29   * @version $Id: ConflictResolver.java 958295 2010-06-26 23:16:18Z hboutemy $
30   */
31  public interface ConflictResolver
32  {
33      String ROLE = ConflictResolver.class.getName();
34  
35      /**
36       * Determines which of the specified versions of an artifact to use when there are conflicting declarations.
37       *
38       * @param node1 the first artifact declaration
39       * @param node2 the second artifact declaration
40       * @return the artifact declaration to use: <code>node1</code>; <code>node2</code>; or <code>null</code>if
41       *         this conflict cannot be resolved
42       * @since 3.0
43       */
44      ResolutionNode resolveConflict( ResolutionNode node1, ResolutionNode node2 );
45  }