package org.apache.maven;
   
   /*
    * 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.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.LinkedHashSet;
  import java.util.Set;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.ArtifactUtils;
  import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
  import org.apache.maven.artifact.resolver.ArtifactResolutionException;
  import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;
  import org.apache.maven.artifact.resolver.ArtifactResolutionResult;
  import org.apache.maven.artifact.resolver.MultipleArtifactsNotFoundException;
  import org.apache.maven.artifact.resolver.ResolutionErrorHandler;
  import org.apache.maven.artifact.resolver.filter.CumulativeScopeArtifactFilter;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.artifact.ProjectArtifact;
  import org.apache.maven.repository.RepositorySystem;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  
  @Component(role = ProjectDependenciesResolver.class)
  public class DefaultProjectDependenciesResolver
      implements ProjectDependenciesResolver
  {
  
      @Requirement
      private RepositorySystem repositorySystem;
  
      @Requirement
      private ResolutionErrorHandler resolutionErrorHandler;
  
      public Set<Artifact> resolve( MavenProject project, Collection<String> scopesToResolve, MavenSession session )
          throws ArtifactResolutionException, ArtifactNotFoundException
      {
          return resolve( Collections.singleton( project ), scopesToResolve, session );
      }
  
      public Set<Artifact> resolve( MavenProject project, Collection<String> scopesToCollect,
                                    Collection<String> scopesToResolve, MavenSession session )
          throws ArtifactResolutionException, ArtifactNotFoundException
      {
          Set<MavenProject> mavenProjects = Collections.singleton( project );
          return resolveImpl( mavenProjects, scopesToCollect, scopesToResolve, session,
                              getIgnorableArtifacts( mavenProjects ) );
      }
  
      public Set<Artifact> resolve( Collection<? extends MavenProject> projects, Collection<String> scopesToResolve,
                                    MavenSession session )
          throws ArtifactResolutionException, ArtifactNotFoundException
      {
          return resolveImpl( projects, null, scopesToResolve, session, getIgnorableArtifacts( projects ) );
      }
  
      public Set<Artifact> resolve( MavenProject project, Collection<String> scopesToCollect,
                                    Collection<String> scopesToResolve, MavenSession session,
                                    Set<Artifact> ignoreableArtifacts )
          throws ArtifactResolutionException, ArtifactNotFoundException
      {
          return resolveImpl( Collections.singleton( project ), scopesToCollect, scopesToResolve, session,
                              getIgnorableArtifacts( ignoreableArtifacts ) );
      }
  
  
      private Set<Artifact> resolveImpl( Collection<? extends MavenProject> projects, Collection<String> scopesToCollect,
                                         Collection<String> scopesToResolve, MavenSession session,
                                         Set<String> projectIds )
          throws ArtifactResolutionException, ArtifactNotFoundException
      {
          Set<Artifact> resolved = new LinkedHashSet<Artifact>();
  
          if ( projects == null || projects.isEmpty() )
          {
              return resolved;
          }
  
         if ( ( scopesToCollect == null || scopesToCollect.isEmpty() ) &&
             ( scopesToResolve == null || scopesToResolve.isEmpty() ) )
         {
             return resolved;
         }
 
         /*
 
         Logic for transitive global exclusions
 
         List<String> exclusions = new ArrayList<String>();
 
         for ( Dependency d : project.getDependencies() )
         {
             if ( d.getExclusions() != null )
             {
                 for ( Exclusion e : d.getExclusions() )
                 {
                     exclusions.add(  e.getGroupId() + ":" + e.getArtifactId() );
                 }
             }
         }
 
         ArtifactFilter scopeFilter = new ScopeArtifactFilter( scope );
 
         ArtifactFilter filter;
 
         if ( ! exclusions.isEmpty() )
         {
             filter = new AndArtifactFilter( Arrays.asList( new ArtifactFilter[]{ new ExcludesArtifactFilter( exclusions ), scopeFilter } ) );
         }
         else
         {
             filter = scopeFilter;
         }
         */
 
         CumulativeScopeArtifactFilter resolutionScopeFilter = new CumulativeScopeArtifactFilter( scopesToResolve );
 
         CumulativeScopeArtifactFilter collectionScopeFilter = new CumulativeScopeArtifactFilter( scopesToCollect );
         collectionScopeFilter = new CumulativeScopeArtifactFilter( collectionScopeFilter, resolutionScopeFilter );
 
         ArtifactResolutionRequest request =
             new ArtifactResolutionRequest().setResolveRoot( false ).setResolveTransitively( true ).setCollectionFilter(
                 collectionScopeFilter ).setResolutionFilter( resolutionScopeFilter ).setLocalRepository(
                 session.getLocalRepository() ).setOffline( session.isOffline() ).setForceUpdate(
                 session.getRequest().isUpdateSnapshots() );
         request.setServers( session.getRequest().getServers() );
         request.setMirrors( session.getRequest().getMirrors() );
         request.setProxies( session.getRequest().getProxies() );
 
         for ( MavenProject project : projects )
         {
             request.setArtifact( new ProjectArtifact( project ) );
             request.setArtifactDependencies( project.getDependencyArtifacts() );
             request.setManagedVersionMap( project.getManagedVersionMap() );
             request.setRemoteRepositories( project.getRemoteArtifactRepositories() );
 
             ArtifactResolutionResult result = repositorySystem.resolve( request );
 
             try
             {
                 resolutionErrorHandler.throwErrors( request, result );
             }
             catch ( MultipleArtifactsNotFoundException e )
             {
 
                 Collection<Artifact> missing = new HashSet<Artifact>( e.getMissingArtifacts() );
 
                 for ( Iterator<Artifact> it = missing.iterator(); it.hasNext(); )
                 {
                     String key = ArtifactUtils.key( it.next() );
                     if ( projectIds.contains( key ) )
                     {
                         it.remove();
                     }
                 }
 
                 if ( !missing.isEmpty() )
                 {
                     throw e;
                 }
             }
 
             resolved.addAll( result.getArtifacts() );
         }
 
         return resolved;
     }
 
 
     private Set<String> getIgnorableArtifacts( Collection<? extends MavenProject> projects )
     {
         Set<String> projectIds = new HashSet<String>( projects.size() * 2 );
 
         for ( MavenProject p : projects )
         {
             String key = ArtifactUtils.key( p.getGroupId(), p.getArtifactId(), p.getVersion() );
             projectIds.add( key );
         }
         return projectIds;
     }
 
     private Set<String> getIgnorableArtifacts( Iterable<Artifact> artifactIterable )
     {
         Set<String> projectIds = new HashSet<String>();
 
         for ( Artifact artifact : artifactIterable )
         {
             String key = ArtifactUtils.key( artifact );
             projectIds.add( key );
         }
         return projectIds;
     }
 
 }