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A fork of the RXTX library with a focus on ease of use and embeddability in other libraries.
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/*-------------------------------------------------------------------------
|   RXTX License v 2.1 - LGPL v 2.1 + Linking Over Controlled Interface.
|   Copyright 2010 by Archie L. Cobbs and others.
|
|   A copy of the LGPL v 2.1 may be found at
|   http://www.gnu.org/licenses/lgpl.txt on March 4th 2007.  A copy is
|   here for your convenience.
|
|   This library is free software; you can redistribute it and/or
|   modify it under the terms of the GNU Lesser General Public
|   License as published by the Free Software Foundation; either
|   version 2.1 of the License, or (at your option) any later version.
|
|   This library is distributed in the hope that it will be useful,
|   but WITHOUT ANY WARRANTY; without even the implied warranty of
|   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
|   Lesser General Public License for more details.
|
|   An executable that contains no derivative of any portion of RXTX, but
|   is designed to work with RXTX by being dynamically linked with it,
|   is considered a "work that uses the Library" subject to the terms and
|   conditions of the GNU Lesser General Public License.
|
|   The following has been added to the RXTX License to remove
|   any confusion about linking to RXTX.   We want to allow in part what
|   section 5, paragraph 2 of the LGPL does not permit in the special
|   case of linking over a controlled interface.  The intent is to add a
|   Java Specification Request or standards body defined interface in the 
|   future as another exception but one is not currently available.
|
|   http://www.fsf.org/licenses/gpl-faq.html#LinkingOverControlledInterface
|
|   As a special exception, the copyright holders of RXTX give you
|   permission to link RXTX with independent modules that communicate with
|   RXTX solely through the Sun Microsytems CommAPI interface version 2,
|   regardless of the license terms of these independent modules, and to copy
|   and distribute the resulting combined work under terms of your choice,
|   provided that every copy of the combined work is accompanied by a complete
|   copy of the source code of RXTX (the version of RXTX used to produce the
|   combined work), being distributed under the terms of the GNU Lesser General
|   Public License plus this exception.  An independent module is a
|   module which is not derived from or based on RXTX.
|
|   Note that people who make modified versions of RXTX are not obligated
|   to grant this special exception for their modified versions; it is
|   their choice whether to do so.  The GNU Lesser General Public License
|   gives permission to release a modified version without this exception; this
|   exception also makes it possible to release a modified version which
|   carries forward this exception.
|
|   You should have received a copy of the GNU Lesser General Public
|   License along with this library; if not, write to the Free
|   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
|   All trademarks belong to their respective owners.
--------------------------------------------------------------------------*/
package gnu.io.rfc2217;

import org.apache.commons.net.telnet.TelnetOptionHandler;

/**
 * RFC 2217 telnet COM-PORT-OPTION.
 *
 * @see RFC 2217
 */
public class ComPortOptionHandler extends TelnetOptionHandler {

    private final TelnetSerialPort port;

    protected ComPortOptionHandler(TelnetSerialPort telnetSerialPort) {
        super(RFC2217.COM_PORT_OPTION, true, false, true, false);
        if (telnetSerialPort == null)
            throw new IllegalArgumentException("null telnetSerialPort");
        this.port = telnetSerialPort;
    }

    @Override
    public int[] answerSubnegotiation(int[] data, int length) {

        // Copy data into buffer of the correct size
        if (data.length != length) {
            int[] data2 = new int[length];
            System.arraycopy(data, 0, data2, 0, length);
            data = data2;
        }

        // Decode option
        ComPortCommand command;
        try {
            command = RFC2217.decodeComPortCommand(data);
        } catch (IllegalArgumentException e) {
            System.err.println(this.port.getName() + ": rec'd invalid COM-PORT-OPTION command: " + e.getMessage());
            return null;
        }

        // Notify port
        this.port.handleCommand(command);
        return null;
    }

    @Override
    public int[] startSubnegotiationLocal() {
        this.port.startSubnegotiation();
        return null;
    }

    @Override
    public int[] startSubnegotiationRemote() {
        return null;
    }
}