package org.apache.maven.shared.transfer.dependencies.resolve.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.Collection;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.maven.RepositoryUtils;
  import org.apache.maven.artifact.handler.ArtifactHandler;
  import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
  import org.apache.maven.model.DependencyManagement;
  import org.apache.maven.model.Model;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.shared.artifact.filter.resolve.TransformableFilter;
  import org.apache.maven.shared.artifact.filter.resolve.transform.SonatypeAetherFilterTransformer;
  import org.apache.maven.shared.transfer.dependencies.DependableCoordinate;
  import org.apache.maven.shared.transfer.dependencies.resolve.DependencyResolver;
  import org.apache.maven.shared.transfer.dependencies.resolve.DependencyResolverException;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  
  import org.sonatype.aether.RepositorySystem;
  import org.sonatype.aether.RepositorySystemSession;
  import org.sonatype.aether.artifact.Artifact;
  import org.sonatype.aether.artifact.ArtifactType;
  import org.sonatype.aether.artifact.ArtifactTypeRegistry;
  import org.sonatype.aether.collection.CollectRequest;
  import org.sonatype.aether.collection.DependencyCollectionException;
  import org.sonatype.aether.graph.Dependency;
  import org.sonatype.aether.graph.DependencyFilter;
  import org.sonatype.aether.repository.RemoteRepository;
  import org.sonatype.aether.resolution.ArtifactResolutionException;
  import org.sonatype.aether.resolution.ArtifactResult;
  import org.sonatype.aether.util.artifact.DefaultArtifact;
  import org.sonatype.aether.util.artifact.DefaultArtifactType;
  
  /**
   * 
   */
  @Component( role = DependencyResolver.class, hint = "maven3" )
  class Maven30DependencyResolver
      implements DependencyResolver
  {
      @Requirement
      private RepositorySystem repositorySystem;
  
      @Requirement
      private ArtifactHandlerManager artifactHandlerManager;
  
      @Override
      // CHECKSTYLE_OFF: LineLength
      public Iterable<org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult> resolveDependencies( ProjectBuildingRequest buildingRequest,
                                                                                                    DependableCoordinate coordinate,
                                                                                                    TransformableFilter dependencyFilter )
      // CHECKSTYLE_ON: LineLength
          throws DependencyResolverException
      {
          ArtifactTypeRegistry typeRegistry =
              (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
                                                     ArtifactHandlerManager.class, artifactHandlerManager );
  
          Dependency aetherRoot = toDependency( coordinate, typeRegistry );
  
          @SuppressWarnings( "unchecked" )
          List<RemoteRepository> aetherRepositories =
              (List<RemoteRepository>) Invoker.invoke( RepositoryUtils.class, "toRepos", List.class,
                                                       buildingRequest.getRemoteRepositories() );
  
          CollectRequest request = new CollectRequest( aetherRoot, aetherRepositories );
  
          return resolveDependencies( buildingRequest, aetherRepositories, dependencyFilter, request );
      }
      
      @Override
      // CHECKSTYLE_OFF: LineLength
      public Iterable<org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult> resolveDependencies( ProjectBuildingRequest buildingRequest,
                                                                                                    Model model,
                                                                                                    TransformableFilter dependencyFilter )
      // CHECKSTYLE_ON: LineLength
          throws DependencyResolverException
     {
         // Are there examples where packaging and type are NOT in sync
         ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( model.getPackaging() );
         
         String extension = artifactHandler != null ? artifactHandler.getExtension() : null;
         
         Artifact aetherArtifact =
             new DefaultArtifact( model.getGroupId(), model.getArtifactId(), extension, model.getVersion() );
         
         Dependency aetherRoot = new Dependency( aetherArtifact, null );
         
         @SuppressWarnings( "unchecked" )
         List<RemoteRepository> aetherRepositories =
             (List<RemoteRepository>) Invoker.invoke( RepositoryUtils.class, "toRepos", List.class,
                                                      buildingRequest.getRemoteRepositories() );
 
         CollectRequest request = new CollectRequest( aetherRoot, aetherRepositories );
         
         ArtifactTypeRegistry typeRegistry =
                         (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
                                                                ArtifactHandlerManager.class, artifactHandlerManager );
 
         List<Dependency> aetherDependencies = new ArrayList<Dependency>( model.getDependencies().size() );
         for ( org.apache.maven.model.Dependency mavenDependency : model.getDependencies() )
         {
             aetherDependencies.add( toDependency( mavenDependency, typeRegistry ) );
         }
         request.setDependencies( aetherDependencies );
 
         DependencyManagement mavenDependencyManagement = model.getDependencyManagement();
         if ( mavenDependencyManagement != null )
         {
             List<Dependency> aetherManagerDependencies =
                 new ArrayList<Dependency>( mavenDependencyManagement.getDependencies().size() );
             
             for ( org.apache.maven.model.Dependency mavenDependency : mavenDependencyManagement.getDependencies() )
             {
                 aetherManagerDependencies.add( toDependency( mavenDependency, typeRegistry ) );
             }
             
             request.setManagedDependencies( aetherManagerDependencies );
         }
 
         return resolveDependencies( buildingRequest, aetherRepositories, dependencyFilter, request );
     }
 
     @Override
     // CHECKSTYLE_OFF: LineLength
     public Iterable<org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult> resolveDependencies( ProjectBuildingRequest buildingRequest,
                                                                                                   Collection<org.apache.maven.model.Dependency> mavenDependencies,
                                                                                                   Collection<org.apache.maven.model.Dependency> managedMavenDependencies,
                                                                                                   TransformableFilter filter )
     // CHECKSTYLE_ON: LineLength
         throws DependencyResolverException
     {
         ArtifactTypeRegistry typeRegistry =
             (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
                                                    ArtifactHandlerManager.class, artifactHandlerManager );
 
         final Class<?>[] argClasses =
             new Class<?>[] { org.apache.maven.model.Dependency.class, ArtifactTypeRegistry.class };
 
          List<Dependency> aetherDependencies = new ArrayList<Dependency>( mavenDependencies.size() );
 
          if ( mavenDependencies != null )
          {
              aetherDependencies = new ArrayList<Dependency>( mavenDependencies.size() );
 
              for ( org.apache.maven.model.Dependency mavenDependency : mavenDependencies )
              {
                  Object[] args = new Object[] { mavenDependency, typeRegistry };
 
                  Dependency aetherDependency =
                      (Dependency) Invoker.invoke( RepositoryUtils.class, "toDependency", argClasses, args );
 
                  aetherDependencies.add( aetherDependency );
              }
          }
 
         List<Dependency> aetherManagedDependencies = null;
 
         if ( managedMavenDependencies != null )
         {
             aetherManagedDependencies = new ArrayList<Dependency>( managedMavenDependencies.size() );
 
             for ( org.apache.maven.model.Dependency mavenDependency : managedMavenDependencies )
             {
                 Object[] args = new Object[] { mavenDependency, typeRegistry };
 
                 Dependency aetherDependency =
                     (Dependency) Invoker.invoke( RepositoryUtils.class, "toDependency", argClasses, args );
 
                 aetherManagedDependencies.add( aetherDependency );
             }
         }
 
         @SuppressWarnings( "unchecked" )
         List<RemoteRepository> aetherRepositories =
             (List<RemoteRepository>) Invoker.invoke( RepositoryUtils.class, "toRepos", List.class,
                                                      buildingRequest.getRemoteRepositories() );
 
         CollectRequest request =
             new CollectRequest( aetherDependencies, aetherManagedDependencies, aetherRepositories );
 
         return resolveDependencies( buildingRequest, aetherRepositories, filter, request );
     }
 
     // CHECKSTYLE_OFF: LineLength
     private Iterable<org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult> resolveDependencies( ProjectBuildingRequest buildingRequest,
                                                                                                    List<RemoteRepository> aetherRepositories,
                                                                                                    TransformableFilter dependencyFilter,
                                                                                                    CollectRequest request )
                                                                                                        throws DependencyResolverException
     // CHECKSTYLE_ON :LineLength
     {
         try
         {
             DependencyFilter depFilter = null;
             if ( dependencyFilter != null )
             {
                 depFilter = dependencyFilter.transform( new SonatypeAetherFilterTransformer() );
             }
 
             RepositorySystemSession session =
                 (RepositorySystemSession) Invoker.invoke( buildingRequest, "getRepositorySession" );
 
             final List<ArtifactResult> dependencyResults =
                 repositorySystem.resolveDependencies( session, request, depFilter );
 
             // Keep it lazy! Often artifactsResults aren't used, so transforming up front is too expensive
             return new Iterable<org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult>()
             {
                 @Override
                 public Iterator<org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult> iterator()
                 {
                     // CHECKSTYLE_OFF: LineLength
                     Collection<org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult> artResults =
                         new ArrayList<org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult>( dependencyResults.size() );
                     // CHECKSTYLE_ON: LineLength
                     
                     for ( ArtifactResult artifactResult : dependencyResults )
                     {
                         artResults.add( new Maven30ArtifactResult( artifactResult ) );
                     }
 
                     return artResults.iterator();
                 }
             };
         }
         catch ( ArtifactResolutionException e )
         {
             throw new Maven30DependencyResolverException( e );
         }
         catch ( DependencyCollectionException e )
         {
             throw new Maven30DependencyResolverException( e );
         }
     }
 
     /**
      * Based on RepositoryUtils#toDependency(org.apache.maven.model.Dependency, ArtifactTypeRegistry)
      * 
      * @param coordinate
      * @param stereotypes
      * @return as Aether Dependency
      */
     private static Dependency toDependency( DependableCoordinate coordinate, ArtifactTypeRegistry stereotypes )
     {
         ArtifactType stereotype = stereotypes.get( coordinate.getType() );
         if ( stereotype == null )
         {
             stereotype = new DefaultArtifactType( coordinate.getType() );
         }
 
         Artifact artifact =
             new DefaultArtifact( coordinate.getGroupId(), coordinate.getArtifactId(), coordinate.getClassifier(), null,
                                  coordinate.getVersion(), null, stereotype );
 
         return new Dependency( artifact, null );
     }
     
     private static Dependency toDependency( org.apache.maven.model.Dependency mavenDependency,
                                             ArtifactTypeRegistry typeRegistry )
         throws DependencyResolverException
     {
         Class<?>[] argClasses = new Class<?>[] { org.apache.maven.model.Dependency.class, ArtifactTypeRegistry.class };
 
         Object[] args = new Object[] { mavenDependency, typeRegistry };
 
         return (Dependency) Invoker.invoke( RepositoryUtils.class, "toDependency", argClasses, args );
     }  
 }