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.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
  import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactorySelector;
  
  import static java.util.Objects.requireNonNull;
  import static java.util.stream.Collectors.toList;
  
  /**
   * Default implementation.
   *
   * @since 1.8.0
   */
  @Singleton
  @Named
  public class DefaultChecksumAlgorithmFactorySelector
          implements ChecksumAlgorithmFactorySelector
  {
      private final Map<String, ChecksumAlgorithmFactory> factories;
  
      /**
       * Default ctor for SL.
       */
      @Deprecated
      public DefaultChecksumAlgorithmFactorySelector()
      {
          this.factories = new HashMap<>();
          this.factories.put( Sha512ChecksumAlgorithmFactory.NAME, new Sha512ChecksumAlgorithmFactory() );
          this.factories.put( Sha256ChecksumAlgorithmFactory.NAME, new Sha256ChecksumAlgorithmFactory() );
          this.factories.put( Sha1ChecksumAlgorithmFactory.NAME, new Sha1ChecksumAlgorithmFactory() );
          this.factories.put( Md5ChecksumAlgorithmFactory.NAME, new Md5ChecksumAlgorithmFactory() );
      }
  
      @Inject
      public DefaultChecksumAlgorithmFactorySelector( Map<String, ChecksumAlgorithmFactory> factories )
      {
          this.factories = requireNonNull( factories );
      }
  
      @Override
      public ChecksumAlgorithmFactory select( String algorithmName )
      {
          requireNonNull( algorithmName, "algorithmMame must not be null" );
          ChecksumAlgorithmFactory factory =  factories.get( algorithmName );
          if ( factory == null )
          {
              throw new IllegalArgumentException(
                      String.format( "Unsupported checksum algorithm %s, supported ones are %s",
                              algorithmName,
                              getChecksumAlgorithmFactories().stream()
                                                             .map( ChecksumAlgorithmFactory::getName )
                                                             .collect( toList() )
                      )
              );
          }
          return factory;
      }
  
      @Override
      public List<ChecksumAlgorithmFactory> getChecksumAlgorithmFactories()
      {
          return new ArrayList<>( factories.values() );
      }
  }