package org.eclipse.aether.internal.impl;
   
   /*
    * 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.eclipse.aether.spi.connector.checksum.ChecksumPolicy;
  import org.eclipse.aether.transfer.ChecksumFailureException;
  import org.eclipse.aether.transfer.TransferResource;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static java.util.Objects.requireNonNull;
  
  abstract class AbstractChecksumPolicy
      implements ChecksumPolicy
  {
  
      protected final Logger logger = LoggerFactory.getLogger( getClass() );
  
      protected final TransferResource resource;
  
      protected AbstractChecksumPolicy( TransferResource resource )
      {
          this.resource = resource;
      }
  
      public boolean onChecksumMatch( String algorithm, int kind )
      {
          requireNonNull( algorithm, "algorithm cannot be null" );
          return true;
      }
  
      public void onChecksumMismatch( String algorithm, int kind, ChecksumFailureException exception )
          throws ChecksumFailureException
      {
          requireNonNull( algorithm, "algorithm cannot be null" );
          requireNonNull( exception, "exception cannot be null" );
          if ( ( kind & KIND_UNOFFICIAL ) == 0 )
          {
              throw exception;
          }
      }
  
      public void onChecksumError( String algorithm, int kind, ChecksumFailureException exception )
          throws ChecksumFailureException
      {
          requireNonNull( algorithm, "algorithm cannot be null" );
          requireNonNull( exception, "exception cannot be null" );
          logger.debug( "Could not validate {} checksum for {}", algorithm, resource.getResourceName(), exception );
      }
  
      public void onNoMoreChecksums()
          throws ChecksumFailureException
      {
          throw new ChecksumFailureException( "Checksum validation failed, no checksums available" );
      }
  
      public void onTransferRetry()
      {
      }
  
  }