    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.net.telnet;
    019
    020/***
    021 * Implements the telnet echo option RFC 857.
    022 * <p>
    023 * @author Bruno D'Avanzo
    024 ***/
    025public class EchoOptionHandler extends TelnetOptionHandler
    026{
    027    /***
    028     * Constructor for the EchoOptionHandler. Allows defining desired
    029     * initial setting for local/remote activation of this option and
    030     * behaviour in case a local/remote activation request for this
    031     * option is received.
    032     * <p>
    033     * @param initlocal - if set to true, a WILL is sent upon connection.
    034     * @param initremote - if set to true, a DO is sent upon connection.
    035     * @param acceptlocal - if set to true, any DO request is accepted.
    036     * @param acceptremote - if set to true, any WILL request is accepted.
    037     ***/
    038    public EchoOptionHandler(boolean initlocal, boolean initremote,
    039                                boolean acceptlocal, boolean acceptremote)
    040    {
    041        super(TelnetOption.ECHO, initlocal, initremote,
    042                                      acceptlocal, acceptremote);
    043    }
    044
    045    /***
    046     * Constructor for the EchoOptionHandler. Initial and accept
    047     * behaviour flags are set to false
    048     ***/
    049    public EchoOptionHandler()
    050    {
    051        super(TelnetOption.ECHO, false, false, false, false);
    052    }
    053
    054    /***
    055     * Implements the abstract method of TelnetOptionHandler.
    056     * <p>
    057     * @param suboptionData - the sequence received, whithout IAC SB & IAC SE
    058     * @param suboptionLength - the length of data in suboption_data
    059     * <p>
    060     * @return always null (no response to subnegotiation)
    061     ***/
    062    @Override
    063    public int[] answerSubnegotiation(int suboptionData[],
    064                                        int suboptionLength)
    065    {
    066        return null;
    067    }
    068
    069    /***
    070     * Implements the abstract method of TelnetOptionHandler.
    071     * <p>
    072     * @return always null (no response to subnegotiation)
    073     ***/
    074    @Override
    075    public int[] startSubnegotiationLocal()
    076    {
    077        return null;
    078    }
    079
    080    /***
    081     * Implements the abstract method of TelnetOptionHandler.
    082     * <p>
    083     * @return always null (no response to subnegotiation)
    084     ***/
    085    @Override
    086    public int[] startSubnegotiationRemote()
    087    {
    088        return null;
    089    }
    090}