001package 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
022import java.util.ArrayList;
023import java.util.LinkedHashMap;
024import java.util.List;
025import java.util.Map;
026
027import org.apache.maven.model.Dependency;
028import org.apache.maven.model.DependencyManagement;
029import org.apache.maven.model.Model;
030import org.apache.maven.model.building.ModelBuildingRequest;
031import org.apache.maven.model.building.ModelProblemCollector;
032import 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 )
040public 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}