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1   package org.apache.maven.model.composition;
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.ArrayList;
23  import java.util.LinkedHashMap;
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.Model;
30  import org.apache.maven.model.building.ModelBuildingRequest;
31  import org.apache.maven.model.building.ModelProblemCollector;
32  import org.codehaus.plexus.component.annotations.Component;
33  
34  /**
35   * Handles the import of dependency management from other models into the target model.
36   * 
37   * @author Benjamin Bentmann
38   */
39  @Component( role = DependencyManagementImporter.class )
40  public class DefaultDependencyManagementImporter
41      implements DependencyManagementImporter
42  {
43  
44      public void importManagement( Model target, List<? extends DependencyManagement> sources,
45                                    ModelBuildingRequest request, ModelProblemCollector problems )
46      {
47          if ( sources != null && !sources.isEmpty() )
48          {
49              Map<String, Dependency> dependencies = new LinkedHashMap<String, Dependency>();
50  
51              DependencyManagement depMngt = target.getDependencyManagement();
52  
53              if ( depMngt != null )
54              {
55                  for ( Dependency dependency : depMngt.getDependencies() )
56                  {
57                      dependencies.put( dependency.getManagementKey(), dependency );
58                  }
59              }
60              else
61              {
62                  depMngt = new DependencyManagement();
63                  target.setDependencyManagement( depMngt );
64              }
65  
66              for ( DependencyManagement source : sources )
67              {
68                  for ( Dependency dependency : source.getDependencies() )
69                  {
70                      String key = dependency.getManagementKey();
71                      if ( !dependencies.containsKey( key ) )
72                      {
73                          dependencies.put( key, dependency );
74                      }
75                  }
76              }
77  
78              depMngt.setDependencies( new ArrayList<Dependency>( dependencies.values() ) );
79          }
80      }
81  
82  }