enquirelink.java

开放源码的smpp协议开发包

/*
 * Java SMPP API
 * Copyright (C) 1998 - 2002 by Oran Kelly
 * 
 * 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.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * A copy of the LGPL can be viewed at http://www.gnu.org/copyleft/lesser.html
 * Java SMPP API author: [e-mail]
 * Java SMPP API Homepage: http://smppapi.sourceforge.net/
 * $Id: EnquireLink.java,v 1.15 2005/05/09 21:04:48 orank Exp $
 */
package ie.omk.smpp.message;

/**
 * Check the link status. This message can originate from either an ESME or the
 * SMSC. It is used to check that the entity at the other end of the link is
 * still alive and responding to messages. Usually used by the SMSC after a
 * period of inactivity to decide whether to close the link.
 * 
 * @author Oran Kelly
 * @version 1.0
 */
public class EnquireLink extends ie.omk.smpp.message.SMPPRequest {
    /**
     * Construct a new EnquireLink.
     */
    public EnquireLink() {
        super(ENQUIRE_LINK);
    }

    /**
     * Construct a new EnquireLink with specified sequence number.
     * 
     * @param seqNum
     *            The sequence number to use
     * @deprecated
     */
    public EnquireLink(int seqNum) {
        super(ENQUIRE_LINK, seqNum);
    }

    public int getBodyLength() {
        return (0);
    }

    public void readBodyFrom(byte[] body, int offset)
            throws SMPPProtocolException {
    }

    /**
     * Convert this packet to a String. Not to be interpreted programmatically,
     * it's just dead handy for debugging!
     */
    public String toString() {
        return new String("enquire_link");
    }
}