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.deflate;
  
  import io.airlift.compress.v3.hadoop.HadoopOutputStream;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.zip.Deflater;
  
  import static java.util.Objects.requireNonNull;
  
  class JdkDeflateHadoopOutputStream
          extends HadoopOutputStream
  {
      private final byte[] oneByte = new byte[1];
      private final OutputStream output;
      private final Deflater deflater;
      private final byte[] outputBuffer;
      protected boolean closed;
  
      public JdkDeflateHadoopOutputStream(OutputStream output, int bufferSize)
      {
          this.output = requireNonNull(output, "output is null");
          this.deflater = new Deflater();
          this.outputBuffer = new byte[bufferSize];
      }
  
      @Override
      public void write(int b)
              throws IOException
      {
          oneByte[0] = (byte) b;
          write(oneByte, 0, 1);
      }
  
      @Override
      public void write(byte[] buffer, int offset, int length)
              throws IOException
      {
          deflater.setInput(buffer, offset, length);
          while (!deflater.needsInput()) {
              compress();
          }
      }
  
      @Override
      public void finish()
              throws IOException
      {
          if (!deflater.finished()) {
              deflater.finish();
              while (!deflater.finished()) {
                  compress();
              }
          }
          deflater.reset();
      }
  
      private void compress()
              throws IOException
      {
          int compressedSize = deflater.deflate(outputBuffer, 0, outputBuffer.length);
          output.write(outputBuffer, 0, compressedSize);
      }
  
      @Override
      public void flush()
              throws IOException
      {
          output.flush();
      }
  
      @Override
      public void close()
              throws IOException
      {
          if (!closed) {
              closed = true;
              try {
                  finish();
              }
              finally {
                  output.close();
              }
          }
      }
  }
  