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.lzo;
  
  import io.airlift.compress.v3.hadoop.CodecAdapter;
  import org.apache.hadoop.conf.Configuration;
  
  import java.util.Optional;
  
  import static org.apache.hadoop.fs.CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_DEFAULT;
  import static org.apache.hadoop.fs.CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZO_BUFFERSIZE_KEY;
  
  public class LzoCodec
          extends CodecAdapter
  {
      public LzoCodec()
      {
          super(configuration -> new LzoHadoopStreams(getBufferSize(configuration)));
      }
  
      static int getBufferSize(Optional<Configuration> configuration)
      {
          // To decode a LZO block we must preallocate an output buffer, but
          // the Hadoop block stream format does not include the uncompressed
          // size of chunks.  Instead, we must rely on the "configured"
          // maximum buffer size used by the writer of the file.
          return configuration
              .map(conf -> conf.getInt(IO_COMPRESSION_CODEC_LZO_BUFFERSIZE_KEY, IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_DEFAULT))
              .orElse(IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_DEFAULT);
      }
  }
  