/*
    *
    * 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.apache.hadoop.hbase.rest.filter;
  
  import java.io.IOException;
  import java.util.zip.GZIPOutputStream;
  
  import javax.servlet.ServletOutputStream;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  
  @InterfaceAudience.Private
  public class GZIPResponseStream extends ServletOutputStream {
    private HttpServletResponse response;
    private GZIPOutputStream out;
  
    public GZIPResponseStream(HttpServletResponse response) throws IOException {
      this.response = response;
      this.out = new GZIPOutputStream(response.getOutputStream());
      response.addHeader("Content-Encoding", "gzip");
    }
  
    public void resetBuffer() {
      if (out != null && !response.isCommitted()) {
        response.setHeader("Content-Encoding", null);
      }
      out = null;
    }
  
    @Override
    public void write(int b) throws IOException {
      out.write(b);
    }
  
    @Override
    public void write(byte[] b) throws IOException {
      out.write(b);
    }
  
    @Override
    public void write(byte[] b, int off, int len) throws IOException {
      out.write(b, off, len);
    }
  
    @Override
    public void close() throws IOException {
      finish();
      out.close();
    }
  
    @Override
    public void flush() throws IOException {
      out.flush();
    }
  
    public void finish() throws IOException {
      out.finish();
    }
  }