/*
    * 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.myfaces.shared.view;
  
  import java.io.IOException;
  
  import javax.servlet.ServletOutputStream;
  import javax.servlet.WriteListener;
  
  /**
   * Delegates the standard OutputStream-methods (close, flush, write)
   * to the given ServletOutputStream, if the ResponseSwitch is enabled
   */
  class SwitchableOutputStream extends ServletOutputStream
  {
  
      ServletOutputStream _delegate = null;
      ResponseSwitch _responseSwitch = null;
  
      public SwitchableOutputStream(ServletOutputStream delegate, ResponseSwitch responseSwitch)
      {
          _delegate = delegate;
          _responseSwitch = responseSwitch;
      }
  
      @Override
      public void close() throws IOException
      {
          if (_responseSwitch.isEnabled())
          {
              _delegate.close();
          }
      }
  
      @Override
      public void flush() throws IOException
      {
          if (_responseSwitch.isEnabled())
          {
              _delegate.flush();
          }
      }
  
      @Override
      public void write(byte[] b, int off, int len) throws IOException
      {
          if (_responseSwitch.isEnabled())
          {
              _delegate.write(b, off, len);
          }
      }
  
      @Override
      public void write(byte[] b) throws IOException
      {
          if (_responseSwitch.isEnabled())
          {
              _delegate.write(b);
          }
      }
  
      @Override
      public void write(int b) throws IOException
      {
          if (_responseSwitch.isEnabled())
          {
              _delegate.write(b);
          }
      }
  
      @Override
      public boolean isReady()
      {
          if (_responseSwitch.isEnabled())
          {
              return _delegate.isReady();
          }
          
          return true;
      }
  
      @Override
      public void setWriteListener(WriteListener wl)
     {
         if (_responseSwitch.isEnabled())
         {
             _delegate.setWriteListener(wl);
         }
     }
     
 }