001    package org.apache.maven.model.management;
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.Collections;
023    import java.util.HashMap;
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.Exclusion;
030    import org.apache.maven.model.Model;
031    import org.apache.maven.model.building.ModelBuildingRequest;
032    import org.apache.maven.model.building.ModelProblemCollector;
033    import org.apache.maven.model.merge.MavenModelMerger;
034    import org.codehaus.plexus.component.annotations.Component;
035    
036    /**
037     * Handles injection of dependency management into the model.
038     *
039     * @author Benjamin Bentmann
040     */
041    @Component( role = DependencyManagementInjector.class )
042    public class DefaultDependencyManagementInjector
043        implements DependencyManagementInjector
044    {
045    
046        private ManagementModelMerger merger = new ManagementModelMerger();
047    
048        public void injectManagement( Model model, ModelBuildingRequest request, ModelProblemCollector problems )
049        {
050            merger.mergeManagedDependencies( model );
051        }
052    
053        protected static class ManagementModelMerger
054            extends MavenModelMerger
055        {
056    
057            public void mergeManagedDependencies( Model model )
058            {
059                DependencyManagement dependencyManagement = model.getDependencyManagement();
060                if ( dependencyManagement != null )
061                {
062                    Map<Object, Dependency> dependencies = new HashMap<Object, Dependency>();
063                    Map<Object, Object> context = Collections.emptyMap();
064    
065                    for ( Dependency dependency : model.getDependencies() )
066                    {
067                        Object key = getDependencyKey( dependency );
068                        dependencies.put( key, dependency );
069                    }
070    
071                    for ( Dependency managedDependency : dependencyManagement.getDependencies() )
072                    {
073                        Object key = getDependencyKey( managedDependency );
074                        Dependency dependency = dependencies.get( key );
075                        if ( dependency != null )
076                        {
077                            mergeDependency( dependency, managedDependency, false, context );
078                        }
079                    }
080                }
081            }
082    
083            @Override
084            protected void mergeDependency_Optional( Dependency target, Dependency source, boolean sourceDominant,
085                                                     Map<Object, Object> context )
086            {
087                // optional flag is not managed
088            }
089    
090            @Override
091            protected void mergeDependency_Exclusions( Dependency target, Dependency source, boolean sourceDominant,
092                                                       Map<Object, Object> context )
093            {
094                List<Exclusion> tgt = target.getExclusions();
095                if ( tgt.isEmpty() )
096                {
097                    List<Exclusion> src = source.getExclusions();
098    
099                    for ( Exclusion element : src )
100                    {
101                        Exclusion clone = element.clone();
102                        target.addExclusion( clone );
103                    }
104                }
105            }
106    
107        }
108    
109    }