content: /*
   * Licensed 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 io.airlift.compress.v3.hadoop;
  
  import org.apache.hadoop.io.compress.CompressionInputStream;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  import static java.util.Objects.requireNonNull;
  
  final class CompressionInputStreamAdapter
          extends CompressionInputStream
  {
      private static final InputStream FAKE_INPUT_STREAM = new InputStream()
      {
          @Override
          public int read()
          {
              throw new UnsupportedOperationException();
          }
      };
  
      private final HadoopInputStream input;
      private final PositionSupplier positionSupplier;
  
      public CompressionInputStreamAdapter(HadoopInputStream input, PositionSupplier positionSupplier)
              throws IOException
      {
          super(FAKE_INPUT_STREAM);
          this.input = requireNonNull(input, "input is null");
          this.positionSupplier = requireNonNull(positionSupplier, "positionSupplier is null");
      }
  
      @Override
      public int read()
              throws IOException
      {
          return input.read();
      }
  
      @Override
      public int read(byte[] b, int off, int len)
              throws IOException
      {
          return input.read(b, off, len);
      }
  
      @Override
      public long getPos()
              throws IOException
      {
          return positionSupplier.getPosition();
      }
  
      @Override
      public void resetState()
      {
          input.resetState();
      }
  
      @Override
      public void close()
              throws IOException
      {
          try {
              super.close();
          }
          finally {
              input.close();
          }
      }
  
      public interface PositionSupplier
      {
          long getPosition()
                  throws IOException;
      }
  }
  