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1   package org.apache.maven;
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 java.io.File;
23  import java.util.LinkedHashMap;
24  import java.util.List;
25  import java.util.Map;
26  
27  /**
28   * Signals a collision of two or more projects with the same g:a:v during a reactor build.
29   *
30   * @author Benjamin Bentmann
31   */
32  public class DuplicateProjectException
33      extends MavenExecutionException
34  {
35  
36      private Map<String, List<File>> collisions;
37  
38      /**
39       * Creates a new exception with specified details.
40       *
41       * @param message The message text, may be {@code null}.
42       * @param collisions The POM files of the projects that collided, indexed by their g:a:v, may be {@code null}.
43       */
44      public DuplicateProjectException( String message, Map<String, List<File>> collisions )
45      {
46          super( message, (File) null );
47  
48          this.collisions = ( collisions != null ) ? collisions : new LinkedHashMap<String, List<File>>();
49      }
50  
51      /**
52       * Gets the POM files of the projects that collided.
53       *
54       * @return The POM files of the projects that collided, indexed by their g:a:v, never {@code null}.
55       */
56      public Map<String, List<File>> getCollisions()
57      {
58          return collisions;
59      }
60  
61  }