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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  @Component( role = DependencyManagementInjector.class )
42  public class DefaultDependencyManagementInjector
43      implements DependencyManagementInjector
44  {
45  
46      private ManagementModelMerger merger = new ManagementModelMerger();
47  
48      @Override
49      public void injectManagement( Model model, ModelBuildingRequest request, ModelProblemCollector problems )
50      {
51          merger.mergeManagedDependencies( model );
52      }
53  
54      protected static class ManagementModelMerger
55          extends MavenModelMerger
56      {
57  
58          public void mergeManagedDependencies( Model model )
59          {
60              DependencyManagement dependencyManagement = model.getDependencyManagement();
61              if ( dependencyManagement != null )
62              {
63                  Map<Object, Dependency> dependencies = new HashMap<>();
64                  Map<Object, Object> context = Collections.emptyMap();
65  
66                  for ( Dependency dependency : model.getDependencies() )
67                  {
68                      Object key = getDependencyKey( dependency );
69                      dependencies.put( key, dependency );
70                  }
71  
72                  for ( Dependency managedDependency : dependencyManagement.getDependencies() )
73                  {
74                      Object key = getDependencyKey( managedDependency );
75                      Dependency dependency = dependencies.get( key );
76                      if ( dependency != null )
77                      {
78                          mergeDependency( dependency, managedDependency, false, context );
79                      }
80                  }
81              }
82          }
83  
84          @Override
85          protected void mergeDependency_Optional( Dependency target, Dependency source, boolean sourceDominant,
86                                                   Map<Object, Object> context )
87          {
88              // optional flag is not managed
89          }
90  
91          @Override
92          protected void mergeDependency_Exclusions( Dependency target, Dependency source, boolean sourceDominant,
93                                                     Map<Object, Object> context )
94          {
95              List<Exclusion> tgt = target.getExclusions();
96              if ( tgt.isEmpty() )
97              {
98                  List<Exclusion> src = source.getExclusions();
99  
100                 for ( Exclusion element : src )
101                 {
102                     Exclusion clone = element.clone();
103                     target.addExclusion( clone );
104                 }
105             }
106         }
107 
108     }
109 
110 }