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.bzip2;
  
  import io.airlift.compress.v3.hadoop.HadoopOutputStream;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  import static java.util.Objects.requireNonNull;
  
  // forked from Apache Hadoop
  class BZip2HadoopOutputStream
          extends HadoopOutputStream
  {
      private final OutputStream rawOutput;
      private boolean initialized;
      private CBZip2OutputStream output;
  
      public BZip2HadoopOutputStream(OutputStream out)
      {
          this.rawOutput = requireNonNull(out, "out is null");
      }
  
      @Override
      public void write(int b)
              throws IOException
      {
          openStreamIfNecessary();
          output.write(b);
      }
  
      @Override
      public void write(byte[] b, int off, int len)
              throws IOException
      {
          openStreamIfNecessary();
          output.write(b, off, len);
      }
  
      @Override
      public void finish()
              throws IOException
      {
          if (output != null) {
              output.finish();
              output = null;
          }
      }
  
      @Override
      public void flush()
              throws IOException
      {
          rawOutput.flush();
      }
  
      @Override
      public void close()
              throws IOException
      {
          try {
              // it the stream has never been initialized, create an empty block
              if (!initialized) {
                  openStreamIfNecessary();
              }
              finish();
          }
          finally {
              rawOutput.close();
          }
      }
  
      private void openStreamIfNecessary()
              throws IOException
      {
          if (output == null) {
              initialized = true;
              // write magic
              rawOutput.write(new byte[] {'B', 'Z'});
              // open new block
              output = new CBZip2OutputStream(rawOutput);
          }
      }
  }
  