package org.apache.maven.model.composition;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import java.util.ArrayList;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.DependencyManagement;
  import org.apache.maven.model.Model;
  import org.apache.maven.model.building.ModelBuildingRequest;
  import org.apache.maven.model.building.ModelProblemCollector;
  
  /**
   * Handles the import of dependency management from other models into the target model.
   *
   * @author Benjamin Bentmann
   */
  @Named
  @Singleton
  public class DefaultDependencyManagementImporter
      implements DependencyManagementImporter
  {
  
      @Override
      public void importManagement( Model target, List<? extends DependencyManagement> sources,
                                    ModelBuildingRequest request, ModelProblemCollector problems )
      {
          if ( sources != null && !sources.isEmpty() )
          {
              Map<String, Dependency> dependencies = new LinkedHashMap<>();
  
              DependencyManagement depMgmt = target.getDependencyManagement();
  
              if ( depMgmt != null )
              {
                  for ( Dependency dependency : depMgmt.getDependencies() )
                  {
                      dependencies.put( dependency.getManagementKey(), dependency );
                  }
              }
              else
              {
                  depMgmt = new DependencyManagement();
                  target.setDependencyManagement( depMgmt );
              }
  
              for ( DependencyManagement source : sources )
              {
                  for ( Dependency dependency : source.getDependencies() )
                  {
                      String key = dependency.getManagementKey();
                      if ( !dependencies.containsKey( key ) )
                      {
                          dependencies.put( key, dependency );
                      }
                  }
              }
  
              depMgmt.setDependencies( new ArrayList<>( dependencies.values() ) );
          }
      }
  
  }