package org.eclipse.aether.internal.impl.checksum;
   
   /*
    * 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 javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.checksums.TrustedChecksumsSource;
  import org.eclipse.aether.spi.connector.ArtifactDownload;
  import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
  import org.eclipse.aether.spi.connector.checksum.ProvidedChecksumsSource;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Adapter that adapts {@link TrustedChecksumsSource} to {@link ProvidedChecksumsSource} used by connector. Hence, any
   * "trusted" source exist that is enabled, automatically becomes "provided" source as well.
   *
   * @since 1.9.0
   */
  @Singleton
  @Named( TrustedToProvidedChecksumsSourceAdapter.NAME )
  public final class TrustedToProvidedChecksumsSourceAdapter
          implements ProvidedChecksumsSource
  {
      public static final String NAME = "trusted2provided";
  
      private final Map<String, TrustedChecksumsSource> trustedChecksumsSources;
  
      @Inject
      public TrustedToProvidedChecksumsSourceAdapter( Map<String, TrustedChecksumsSource> trustedChecksumsSources )
      {
          this.trustedChecksumsSources = requireNonNull( trustedChecksumsSources );
      }
  
      @Override
      public Map<String, String> getProvidedArtifactChecksums( RepositorySystemSession session,
                                                               ArtifactDownload transfer,
                                                               List<ChecksumAlgorithmFactory> checksumAlgorithmFactories )
      {
          Artifact artifact = transfer.getArtifact();
          for ( RemoteRepository remoteRepository : transfer.getRepositories() )
          {
              for ( TrustedChecksumsSource trustedChecksumsSource : trustedChecksumsSources.values() )
              {
                  Map<String, String> trustedChecksums = trustedChecksumsSource
                          .getTrustedArtifactChecksums( session, artifact, remoteRepository, checksumAlgorithmFactories );
                  if ( trustedChecksums != null && !trustedChecksums.isEmpty() )
                  {
                      return trustedChecksums;
                  }
              }
          }
          return null;
      }
  }