/*
    * 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.
   */
  package org.eclipse.aether.internal.impl;
  
  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;
      }
  
      @Override
      public boolean onChecksumMatch(String algorithm, ChecksumKind kind) {
          requireNonNull(algorithm, "algorithm cannot be null");
          return true;
      }
  
      @Override
      public void onChecksumMismatch(String algorithm, ChecksumKind kind, ChecksumFailureException exception)
              throws ChecksumFailureException {
          requireNonNull(algorithm, "algorithm cannot be null");
          requireNonNull(exception, "exception cannot be null");
          throw exception;
      }
  
      @Override
      public void onChecksumError(String algorithm, ChecksumKind 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);
      }
  
      @Override
      public void onNoMoreChecksums() throws ChecksumFailureException {
          throw new ChecksumFailureException("Checksum validation failed, no checksums available");
      }
  
      @Override
      public void onTransferRetry() {}
  }