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1   package org.apache.maven.model.management;
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.util.Collections;
23  import java.util.HashMap;
24  import java.util.List;
25  import java.util.Map;
26  
27  import org.apache.maven.model.Dependency;
28  import org.apache.maven.model.DependencyManagement;
29  import org.apache.maven.model.Exclusion;
30  import org.apache.maven.model.Model;
31  import org.apache.maven.model.building.ModelBuildingRequest;
32  import org.apache.maven.model.building.ModelProblemCollector;
33  import org.apache.maven.model.merge.MavenModelMerger;
34  import org.codehaus.plexus.component.annotations.Component;
35  
36  /**
37   * Handles injection of dependency management into the model.
38   *
39   * @author Benjamin Bentmann
40   */
41  @SuppressWarnings( { "checkstyle:methodname" } )
42  @Component( role = DependencyManagementInjector.class )
43  public class DefaultDependencyManagementInjector
44      implements DependencyManagementInjector
45  {
46  
47      private ManagementModelMerger merger = new ManagementModelMerger();
48  
49      @Override
50      public void injectManagement( Model model, ModelBuildingRequest request, ModelProblemCollector problems )
51      {
52          merger.mergeManagedDependencies( model );
53      }
54  
55      /**
56       * ManagementModelMerger
57       */
58      protected static class ManagementModelMerger
59          extends MavenModelMerger
60      {
61  
62          public void mergeManagedDependencies( Model model )
63          {
64              DependencyManagement dependencyManagement = model.getDependencyManagement();
65              if ( dependencyManagement != null )
66              {
67                  Map<Object, Dependency> dependencies = new HashMap<>();
68                  Map<Object, Object> context = Collections.emptyMap();
69  
70                  for ( Dependency dependency : model.getDependencies() )
71                  {
72                      Object key = getDependencyKey( dependency );
73                      dependencies.put( key, dependency );
74                  }
75  
76                  for ( Dependency managedDependency : dependencyManagement.getDependencies() )
77                  {
78                      Object key = getDependencyKey( managedDependency );
79                      Dependency dependency = dependencies.get( key );
80                      if ( dependency != null )
81                      {
82                          mergeDependency( dependency, managedDependency, false, context );
83                      }
84                  }
85              }
86          }
87  
88          @Override
89          protected void mergeDependency_Optional( Dependency target, Dependency source, boolean sourceDominant,
90                                                   Map<Object, Object> context )
91          {
92              // optional flag is not managed
93          }
94  
95          @Override
96          protected void mergeDependency_Exclusions( Dependency target, Dependency source, boolean sourceDominant,
97                                                     Map<Object, Object> context )
98          {
99              List<Exclusion> tgt = target.getExclusions();
100             if ( tgt.isEmpty() )
101             {
102                 List<Exclusion> src = source.getExclusions();
103 
104                 for ( Exclusion element : src )
105                 {
106                     Exclusion clone = element.clone();
107                     target.addExclusion( clone );
108                 }
109             }
110         }
111 
112     }
113 
114 }