/*
    * 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.chemistry.opencmis.server.shared;
  
  import java.io.IOException;
  import java.io.OutputStreamWriter;
  import java.io.PrintWriter;
  import java.io.UnsupportedEncodingException;
  
  import javax.servlet.ServletOutputStream;
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.HttpServletResponseWrapper;
  
  public class NoBodyHttpServletResponseWrapper extends HttpServletResponseWrapper {
  
      private final NoBodyOutputStream noBodyStream;
      private PrintWriter writer;
  
      public NoBodyHttpServletResponseWrapper(HttpServletResponse response) throws IOException {
          super(response);
          noBodyStream = new NoBodyOutputStream();
      }
  
      @Override
      public ServletOutputStream getOutputStream() throws IOException {
          return noBodyStream;
      }
  
      @Override
      public PrintWriter getWriter() throws UnsupportedEncodingException {
          if (writer == null) {
              writer = new PrintWriter(new OutputStreamWriter(noBodyStream, getCharacterEncoding()));
          }
  
          return writer;
      }
  
      private static class NoBodyOutputStream extends ServletOutputStream {
          @Override
          public void write(int b) throws IOException {
              // ignore
          }
  
          @Override
          public void write(byte[] b) throws IOException {
              // ignore
          }
  
          @Override
          public void write(byte[] b, int off, int len) throws IOException {
              // ignore
          }
      }
  }