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.LinkedHashSet;
  import java.util.List;
  import java.util.Set;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.artifact.resolver.filter.ExclusionSetFilter;
  import org.apache.maven.extension.internal.CoreExportsProvider;
  
  /**
   * @author Jason van Zyl
   */
  @Named
  @Singleton
  @SuppressWarnings( "deprecation" )
  public class DefaultArtifactFilterManager
      implements ArtifactFilterManager
  {
  
      // this is a live injected collection
      protected final List<ArtifactFilterManagerDelegate> delegates;
  
      protected Set<String> excludedArtifacts;
  
      private final Set<String> coreArtifacts;
  
      @Inject
      public DefaultArtifactFilterManager( List<ArtifactFilterManagerDelegate> delegates,
                                           CoreExportsProvider coreExports )
      {
          this.delegates = delegates;
          this.coreArtifacts = coreExports.get().getExportedArtifacts();
      }
  
      private synchronized Set<String> getExcludedArtifacts()
      {
          if ( excludedArtifacts == null )
          {
              excludedArtifacts = new LinkedHashSet<>( coreArtifacts );
          }
          return excludedArtifacts;
      }
  
      /**
       * Returns the artifact filter for the core + extension artifacts.
       *
       * @see org.apache.maven.ArtifactFilterManager#getArtifactFilter()
       */
      public ArtifactFilter getArtifactFilter()
      {
          Set<String> excludes = new LinkedHashSet<>( getExcludedArtifacts() );
  
          for ( ArtifactFilterManagerDelegate delegate : delegates )
          {
              delegate.addExcludes( excludes );
          }
  
          return new ExclusionSetFilter( excludes );
      }
  
      /**
       * Returns the artifact filter for the standard core artifacts.
       *
       * @see org.apache.maven.ArtifactFilterManager#getCoreArtifactFilter()
       */
      public ArtifactFilter getCoreArtifactFilter()
      {
          return new ExclusionSetFilter( getCoreArtifactExcludes() );
      }
  
      public void excludeArtifact( String artifactId )
      {
          getExcludedArtifacts().add( artifactId );
      }
  
     public Set<String> getCoreArtifactExcludes()
     {
         Set<String> excludes = new LinkedHashSet<>( coreArtifacts );
 
         for ( ArtifactFilterManagerDelegate delegate : delegates )
         {
             delegate.addCoreExcludes( excludes );
         }
 
         return excludes;
     }
 
 }