package org.eclipse.aether.internal.impl.filter;
   
   /*
    * 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.List;
  
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.connector.ArtifactDownload;
  import org.eclipse.aether.spi.connector.ArtifactUpload;
  import org.eclipse.aether.spi.connector.MetadataDownload;
  import org.eclipse.aether.spi.connector.MetadataUpload;
  import org.eclipse.aether.spi.connector.RepositoryConnector;
  import org.eclipse.aether.spi.connector.filter.RemoteRepositoryFilter;
  import org.eclipse.aether.transfer.ArtifactNotFoundException;
  import org.eclipse.aether.transfer.MetadataNotFoundException;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A filtering connector that filter transfers using remote repository filter and delegates to another connector.
   *
   * @since 1.9.0
   */
  public final class FilteringRepositoryConnector
          implements RepositoryConnector
  {
      private final RemoteRepository remoteRepository;
  
      private final RepositoryConnector delegate;
  
      private final RemoteRepositoryFilter remoteRepositoryFilter;
  
      public FilteringRepositoryConnector( RemoteRepository remoteRepository,
                                           RepositoryConnector delegate,
                                           RemoteRepositoryFilter remoteRepositoryFilter )
      {
          this.remoteRepository = requireNonNull( remoteRepository );
          this.delegate = requireNonNull( delegate );
          this.remoteRepositoryFilter = requireNonNull( remoteRepositoryFilter );
      }
  
      @Override
      public void close()
      {
          delegate.close();
      }
  
      @Override
      public void get( Collection<? extends ArtifactDownload> artifactDownloads,
                       Collection<? extends MetadataDownload> metadataDownloads )
      {
          List<ArtifactDownload> filteredArtifactDownloads = null;
          if ( artifactDownloads != null && !artifactDownloads.isEmpty() )
          {
              filteredArtifactDownloads = new ArrayList<>( artifactDownloads.size() );
              for ( ArtifactDownload artifactDownload : artifactDownloads )
              {
                  RemoteRepositoryFilter.Result result = remoteRepositoryFilter.acceptArtifact(
                          remoteRepository, artifactDownload.getArtifact() );
                  if ( result.isAccepted() )
                  {
                      filteredArtifactDownloads.add( artifactDownload );
                  }
                  else
                  {
                      artifactDownload.setException( new ArtifactNotFoundException( artifactDownload.getArtifact(),
                              remoteRepository, result.reasoning() ) );
                  }
              }
          }
          List<MetadataDownload> filteredMetadataDownloads = null;
          if ( metadataDownloads != null && !metadataDownloads.isEmpty() )
          {
              filteredMetadataDownloads = new ArrayList<>( metadataDownloads.size() );
              for ( MetadataDownload metadataDownload : metadataDownloads )
              {
                  RemoteRepositoryFilter.Result result = remoteRepositoryFilter.acceptMetadata(
                          remoteRepository, metadataDownload.getMetadata() );
                  if ( result.isAccepted() )
                  {
                     filteredMetadataDownloads.add( metadataDownload );
                 }
                 else
                 {
                     metadataDownload.setException( new MetadataNotFoundException( metadataDownload.getMetadata(),
                             remoteRepository, result.reasoning() ) );
                 }
             }
         }
         delegate.get( filteredArtifactDownloads, filteredMetadataDownloads );
     }
 
     @Override
     public void put( Collection<? extends ArtifactUpload> artifactUploads,
                      Collection<? extends MetadataUpload> metadataUploads )
     {
         delegate.put( artifactUploads, metadataUploads );
     }
 
     @Override
     public String toString()
     {
         return "filtered(" + delegate.toString() + ")";
     }
 }