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.commons.net.telnet;
  
  /***
   * The TelnetNotificationHandler interface can be used to handle
   * notification of options negotiation commands received on a telnet
   * session.
   * <p>
   * The user can implement this interface and register a
   * TelnetNotificationHandler by using the registerNotificationHandler()
   * of TelnetClient to be notified of option negotiation commands.
   ***/
  
  public interface TelnetNotificationHandler
  {
      /***
       * The remote party sent a DO command.
       ***/
      public static final int RECEIVED_DO =   1;
  
      /***
       * The remote party sent a DONT command.
       ***/
      public static final int RECEIVED_DONT = 2;
  
      /***
       * The remote party sent a WILL command.
       ***/
      public static final int RECEIVED_WILL = 3;
  
      /***
       * The remote party sent a WONT command.
       ***/
      public static final int RECEIVED_WONT = 4;
  
      /***
       * The remote party sent a COMMAND.
       * @since 2.2
       ***/
      public static final int RECEIVED_COMMAND = 5;
  
      /***
       * Callback method called when TelnetClient receives an
       * command or option negotiation command
       *
       * @param negotiation_code - type of (negotiation) command received
       * (RECEIVED_DO, RECEIVED_DONT, RECEIVED_WILL, RECEIVED_WONT, RECEIVED_COMMAND)
       *
       * @param option_code - code of the option negotiated, or the command code itself (e.g. NOP).
       ***/
      public void receivedNegotiation(int negotiation_code, int option_code);
  }
  