package org.apache.maven.plugins.dependency.resolvers;
   
   /*
    * 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 org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.ArtifactUtils;
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.plugin.logging.Log;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.shared.artifact.filter.collection.AbstractArtifactsFilter;
  import org.apache.maven.shared.artifact.filter.collection.ArtifactFilterException;
  
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * {@link ArtifactFilter} implementation that excludes artifacts found in the Reactor.
   *
   * @author Maarten Mulders
   */
  public class ExcludeReactorProjectsArtifactFilter extends AbstractArtifactsFilter
  {
      private final Log log;
      private final Set<String> reactorArtifactKeys;
  
      public ExcludeReactorProjectsArtifactFilter( final List<MavenProject> reactorProjects, final Log log )
      {
          this.log = log;
          this.reactorArtifactKeys = new HashSet<>( reactorProjects.size() );
          for ( final MavenProject project : reactorProjects )
          {
              this.reactorArtifactKeys.add( ArtifactUtils.key( project.getArtifact() ) );
          }
      }
  
      @Override
      public Set<Artifact> filter( final Set<Artifact> artifacts ) throws ArtifactFilterException
      {
          final Set<Artifact> results = new LinkedHashSet<>( artifacts.size() );
  
          for ( final Artifact artifact : artifacts )
          {
              if ( !isArtifactInReactor( artifact ) )
              {
                  results.add( artifact );
              }
              else
              {
                  if ( log.isDebugEnabled() )
                  {
                      log.debug( "Skipped artifact "
                              + ArtifactUtils.key( artifact )
                              + " because it is present in the reactor" );
                  }
              }
          }
  
          return results;
      }
  
      private boolean isArtifactInReactor( final Artifact artifact )
      {
          for ( final String reactorArtifactKey : this.reactorArtifactKeys )
          {
              final String artifactKey = ArtifactUtils.key( artifact );
  
              // This check only includes GAV. Should we take a look at the types, too?
              if ( reactorArtifactKey.equals( artifactKey ) )
              {
                  return true;
              }
          }
          return false;
      }
  }