package org.apache.maven.shared.dependency.graph.internal;
   
   /*
    * 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.Collections;
  import java.util.List;
  import java.util.Map;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  
  import org.apache.maven.RepositoryUtils;
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.repository.ArtifactRepository;
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.shared.dependency.graph.DependencyCollectorBuilder;
  import org.apache.maven.shared.dependency.graph.DependencyCollectorBuilderException;
  import org.apache.maven.shared.dependency.graph.DependencyCollectorRequest;
  import org.apache.maven.shared.dependency.graph.DependencyNode;
  import org.eclipse.aether.DefaultRepositorySystemSession;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.ArtifactTypeRegistry;
  import org.eclipse.aether.collection.CollectRequest;
  import org.eclipse.aether.collection.CollectResult;
  import org.eclipse.aether.collection.DependencyCollectionException;
  import org.eclipse.aether.graph.DependencyVisitor;
  import org.eclipse.aether.graph.Exclusion;
  import org.eclipse.aether.util.graph.manager.DependencyManagerUtils;
  import org.eclipse.aether.util.graph.transformer.ConflictResolver;
  import org.eclipse.aether.util.graph.visitor.TreeDependencyVisitor;
  import org.eclipse.aether.version.VersionConstraint;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Project dependency raw dependency collector API, abstracting Maven 3.1+'s Aether implementation.
   * 
   * @author Gabriel Belingueres
   * @since 3.1.0
   */
  @Named
  public class DefaultDependencyCollectorBuilder
      implements DependencyCollectorBuilder
  {
      private static final Logger LOGGER = LoggerFactory.getLogger( DefaultDependencyCollectorBuilder.class );
  
      private final RepositorySystem repositorySystem;
  
      @Inject
      public DefaultDependencyCollectorBuilder( RepositorySystem repositorySystem )
      {
          this.repositorySystem = repositorySystem;
      }
  
      @Override
      public DependencyNode collectDependencyGraph( DependencyCollectorRequest dependencyCollectorRequest )
          throws DependencyCollectorBuilderException
      {
          DefaultRepositorySystemSession session = null;
          try
          {
              ProjectBuildingRequest buildingRequest = dependencyCollectorRequest.getBuildingRequest();
              MavenProject project = buildingRequest.getProject();
  
              Artifact projectArtifact = project.getArtifact();
              List<ArtifactRepository> remoteArtifactRepositories = project.getRemoteArtifactRepositories();
  
              RepositorySystemSession repositorySession = buildingRequest.getRepositorySession();
  
              session = new DefaultRepositorySystemSession( repositorySession );
  
              session.setDependencyGraphTransformer( dependencyCollectorRequest.getDependencyGraphTransformer() );
  
              session.setDependencySelector( dependencyCollectorRequest.getDependencySelector() );
  
              for ( Map.Entry<String, Object> entry : dependencyCollectorRequest.getConfigProperties().entrySet() )
              {
                 session.setConfigProperty( entry.getKey(), entry.getValue() );
             }
 
             org.eclipse.aether.artifact.Artifact aetherArtifact = RepositoryUtils.toArtifact( projectArtifact );
 
             List<org.eclipse.aether.repository.RemoteRepository> aetherRepos =
                 RepositoryUtils.toRepos( remoteArtifactRepositories );
 
             CollectRequest collectRequest = new CollectRequest();
             collectRequest.setRootArtifact( aetherArtifact );
             collectRequest.setRepositories( aetherRepos );
 
             org.eclipse.aether.artifact.ArtifactTypeRegistry stereotypes = session.getArtifactTypeRegistry();
             collectDependencyList( collectRequest, project, stereotypes );
             collectManagedDependencyList( collectRequest, project, stereotypes );
 
             CollectResult collectResult = repositorySystem.collectDependencies( session, collectRequest );
 
             org.eclipse.aether.graph.DependencyNode rootNode = collectResult.getRoot();
 
             if ( LOGGER.isDebugEnabled() )
             {
                 logTree( rootNode );
             }
 
             return buildDependencyNode( null, rootNode, projectArtifact, dependencyCollectorRequest.getFilter() );
         }
         catch ( DependencyCollectionException e )
         {
             throw new DependencyCollectorBuilderException( "Could not collect dependencies: " + e.getResult(), e );
         }
         finally
         {
             if ( session != null )
             {
                 session.setReadOnly();
             }
         }
     }
 
     private void logTree( org.eclipse.aether.graph.DependencyNode rootNode )
     {
         // print the node tree with its associated data Map
         rootNode.accept( new TreeDependencyVisitor( new DependencyVisitor()
         {
             String indent = "";
 
             @Override
             public boolean visitEnter( org.eclipse.aether.graph.DependencyNode dependencyNode )
             {
                 LOGGER.debug( "{}Aether node: {} data map: {}", indent, dependencyNode, dependencyNode.getData() );
                 indent += "    ";
                 return true;
             }
 
             @Override
             public boolean visitLeave( org.eclipse.aether.graph.DependencyNode dependencyNode )
             {
                 indent = indent.substring( 0, indent.length() - 4 );
                 return true;
             }
         } ) );
     }
 
     private void collectManagedDependencyList( CollectRequest collectRequest, MavenProject project,
                                                ArtifactTypeRegistry stereotypes )
     {
         if ( project.getDependencyManagement() != null )
         {
             for ( Dependency dependency : project.getDependencyManagement().getDependencies() )
             {
                 org.eclipse.aether.graph.Dependency aetherDep = RepositoryUtils.toDependency( dependency, stereotypes );
                 collectRequest.addManagedDependency( aetherDep );
             }
         }
     }
 
     private void collectDependencyList( CollectRequest collectRequest, MavenProject project,
                                         org.eclipse.aether.artifact.ArtifactTypeRegistry stereotypes )
     {
         for ( Dependency dependency : project.getDependencies() )
         {
             org.eclipse.aether.graph.Dependency aetherDep = RepositoryUtils.toDependency( dependency, stereotypes );
             collectRequest.addDependency( aetherDep );
         }
     }
 
     private Artifact getDependencyArtifact( org.eclipse.aether.graph.Dependency dep )
     {
         org.eclipse.aether.artifact.Artifact artifact = dep.getArtifact();
 
         Artifact mavenArtifact = RepositoryUtils.toArtifact( artifact );
         mavenArtifact.setScope( dep.getScope() );
         mavenArtifact.setOptional( dep.isOptional() );
 
         return mavenArtifact;
     }
 
     private DependencyNode buildDependencyNode( DependencyNode parent, org.eclipse.aether.graph.DependencyNode node,
                                                 Artifact artifact, ArtifactFilter filter )
     {
         String premanagedVersion = DependencyManagerUtils.getPremanagedVersion( node );
         String premanagedScope = DependencyManagerUtils.getPremanagedScope( node );
 
         Boolean optional = null;
         if ( node.getDependency() != null )
         {
             optional = node.getDependency().isOptional();
         }
         
         List<org.apache.maven.model.Exclusion> exclusions = null;
         if ( node.getDependency() != null )
         {
             exclusions = new ArrayList<>( node.getDependency().getExclusions().size() );
             for ( Exclusion exclusion : node.getDependency().getExclusions() )
             {
                 org.apache.maven.model.Exclusion modelExclusion = new org.apache.maven.model.Exclusion();
                 modelExclusion.setGroupId( exclusion.getGroupId() );
                 modelExclusion.setArtifactId( exclusion.getArtifactId() );
                 exclusions.add( modelExclusion );
             }
         }
 
         org.eclipse.aether.graph.DependencyNode winner =
             (org.eclipse.aether.graph.DependencyNode) node.getData().get( ConflictResolver.NODE_DATA_WINNER );
         String winnerVersion = null;
         String ignoredScope = null;
         if ( winner != null )
         {
             winnerVersion = winner.getArtifact().getBaseVersion();
         }
         else
         {
             ignoredScope = (String) node.getData().get( VerboseJavaScopeSelector.REDUCED_SCOPE );
         }
         
         ConflictData data = new ConflictData( winnerVersion, ignoredScope );
         
         VerboseDependencyNode current =
             new VerboseDependencyNode( parent, artifact, premanagedVersion, premanagedScope,
                                        getVersionSelectedFromRange( node.getVersionConstraint() ), optional,
                                        exclusions, data );
 
         List<DependencyNode> nodes = new ArrayList<>( node.getChildren().size() );
         for ( org.eclipse.aether.graph.DependencyNode child : node.getChildren() )
         {
             Artifact childArtifact = getDependencyArtifact( child.getDependency() );
 
             if ( ( filter == null ) || filter.include( childArtifact ) )
             {
                 nodes.add( buildDependencyNode( current, child, childArtifact, filter ) );
             }
         }
 
         current.setChildren( Collections.unmodifiableList( nodes ) );
 
         return current;
     }
 
     private String getVersionSelectedFromRange( VersionConstraint constraint )
     {
         if ( ( constraint == null ) || ( constraint.getVersion() != null ) )
         {
             return null;
         }
 
         return constraint.getRange().toString();
     }
 }