content: /*
   * 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.guacamole.protocol;
  
  import org.apache.guacamole.GuacamoleException;
  import org.apache.guacamole.io.GuacamoleReader;
  import org.apache.guacamole.io.GuacamoleWriter;
  import org.apache.guacamole.net.GuacamoleSocket;
  
  /**
   * Implementation of GuacamoleSocket which allows individual instructions to be
   * intercepted, overridden, etc.
   *
   * @author Michael Jumper
   */
  public class FilteredGuacamoleSocket implements GuacamoleSocket {
  
      /**
       * Wrapped GuacamoleSocket.
       */
      private final GuacamoleSocket socket;
  
      /**
       * A reader for the wrapped GuacamoleSocket which may be filtered.
       */
      private final GuacamoleReader reader;
      
      /**
       * A writer for the wrapped GuacamoleSocket which may be filtered.
       */
      private final GuacamoleWriter writer;
      
      /**
       * Creates a new FilteredGuacamoleSocket which uses the given filters to
       * determine whether instructions read/written are allowed through,
       * modified, etc. If reads or writes should be unfiltered, simply specify
       * null rather than a particular filter.
       *
       * @param socket The GuacamoleSocket to wrap.
       * @param readFilter The GuacamoleFilter to apply to all read instructions,
       *                   if any.
       * @param writeFilter The GuacamoleFilter to apply to all written 
       *                    instructions, if any.
       */
      public FilteredGuacamoleSocket(GuacamoleSocket socket, GuacamoleFilter readFilter, GuacamoleFilter writeFilter) {
          this.socket = socket;
  
          // Apply filter to reader
          if (readFilter != null)
              reader = new FilteredGuacamoleReader(socket.getReader(), readFilter);
          else
              reader = socket.getReader();
  
          // Apply filter to writer
          if (writeFilter != null)
              writer = new FilteredGuacamoleWriter(socket.getWriter(), writeFilter);
          else
              writer = socket.getWriter();
  
      }
      
      @Override
      public GuacamoleReader getReader() {
          return reader;
      }
  
      @Override
      public GuacamoleWriter getWriter() {
          return writer;
      }
  
      @Override
      public void close() throws GuacamoleException {
          socket.close();
      }
  
      @Override
      public boolean isOpen() {
          return socket.isOpen();
      }
      
  }
  