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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;
20  
21  import java.io.File;
22  import java.util.LinkedHashMap;
23  import java.util.List;
24  import java.util.Map;
25  
26  /**
27   * Signals a collision of two or more projects with the same g:a:v during a reactor build.
28   *
29   * @author Benjamin Bentmann
30   */
31  public class DuplicateProjectException extends MavenExecutionException {
32  
33      private Map<String, List<File>> collisions;
34  
35      /**
36       * Creates a new exception with specified details.
37       *
38       * @param message The message text, may be {@code null}.
39       * @param collisions The POM files of the projects that collided, indexed by their g:a:v, may be {@code null}.
40       */
41      public DuplicateProjectException(String message, Map<String, List<File>> collisions) {
42          super(message, (File) null);
43  
44          this.collisions = (collisions != null) ? collisions : new LinkedHashMap<>();
45      }
46  
47      /**
48       * Gets the POM files of the projects that collided.
49       *
50       * @return The POM files of the projects that collided, indexed by their g:a:v, never {@code null}.
51       */
52      public Map<String, List<File>> getCollisions() {
53          return collisions;
54      }
55  }