/*
 * Copyright 2003-2004 The Apache Software Foundation
 *
 * Licensed 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;

/***
 * Implements the telnet echo option RFC 857.
 * <p>
 * @author Bruno D'Avanzo
 ***/
public class EchoOptionHandler extends TelnetOptionHandler
{
    /***
     * Constructor for the EchoOptionHandler. Allows defining desired
     * initial setting for local/remote activation of this option and
     * behaviour in case a local/remote activation request for this
     * option is received.
     * <p>
     * @param initlocal - if set to true, a WILL is sent upon connection.
     * @param initremote - if set to true, a DO is sent upon connection.
     * @param acceptlocal - if set to true, any DO request is accepted.
     * @param acceptremote - if set to true, any WILL request is accepted.
     ***/
    public EchoOptionHandler(boolean initlocal, boolean initremote,
                                boolean acceptlocal, boolean acceptremote)
    {
        super(TelnetOption.ECHO, initlocal, initremote,
                                      acceptlocal, acceptremote);
    }

    /***
     * Constructor for the EchoOptionHandler. Initial and accept
     * behaviour flags are set to false
     ***/
    public EchoOptionHandler()
    {
        super(TelnetOption.ECHO, false, false, false, false);
    }

    /***
     * Implements the abstract method of TelnetOptionHandler.
     * <p>
     * @param suboptionData - the sequence received, whithout IAC SB & IAC SE
     * @param suboptionLength - the length of data in suboption_data
     * <p>
     * @return always null (no response to subnegotiation)
     ***/
    public int[] answerSubnegotiation(int suboptionData[],
                                        int suboptionLength)
    {
        return null;
    }

    /***
     * Implements the abstract method of TelnetOptionHandler.
     * <p>
     * @return always null (no response to subnegotiation)
     ***/
    public int[] startSubnegotiationLocal()
    {
        return null;
    }

    /***
     * Implements the abstract method of TelnetOptionHandler.
     * <p>
     * @return always null (no response to subnegotiation)
     ***/
    public int[] startSubnegotiationRemote()
    {
        return null;
    }
}