001    package org.apache.maven.model.composition;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *   http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    import java.util.ArrayList;
023    import java.util.LinkedHashMap;
024    import java.util.List;
025    import java.util.Map;
026    
027    import org.apache.maven.model.Dependency;
028    import org.apache.maven.model.DependencyManagement;
029    import org.apache.maven.model.Model;
030    import org.apache.maven.model.building.ModelBuildingRequest;
031    import org.apache.maven.model.building.ModelProblemCollector;
032    import org.codehaus.plexus.component.annotations.Component;
033    
034    /**
035     * Handles the import of dependency management from other models into the target model.
036     * 
037     * @author Benjamin Bentmann
038     */
039    @Component( role = DependencyManagementImporter.class )
040    public class DefaultDependencyManagementImporter
041        implements DependencyManagementImporter
042    {
043    
044        public void importManagement( Model target, List<? extends DependencyManagement> sources,
045                                      ModelBuildingRequest request, ModelProblemCollector problems )
046        {
047            if ( sources != null && !sources.isEmpty() )
048            {
049                Map<String, Dependency> dependencies = new LinkedHashMap<String, Dependency>();
050    
051                DependencyManagement depMngt = target.getDependencyManagement();
052    
053                if ( depMngt != null )
054                {
055                    for ( Dependency dependency : depMngt.getDependencies() )
056                    {
057                        dependencies.put( dependency.getManagementKey(), dependency );
058                    }
059                }
060                else
061                {
062                    depMngt = new DependencyManagement();
063                    target.setDependencyManagement( depMngt );
064                }
065    
066                for ( DependencyManagement source : sources )
067                {
068                    for ( Dependency dependency : source.getDependencies() )
069                    {
070                        String key = dependency.getManagementKey();
071                        if ( !dependencies.containsKey( key ) )
072                        {
073                            dependencies.put( key, dependency );
074                        }
075                    }
076                }
077    
078                depMngt.setDependencies( new ArrayList<Dependency>( dependencies.values() ) );
079            }
080        }
081    
082    }