/* * Java SMPP API * Copyright (C) 1998 - 2001 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: orank@users.sf.net * Java SMPP API Homepage: http://smppapi.sourceforge.net/ */package ie.omk.smpp.message;import java.io.*;import ie.omk.smpp.BadCommandIDException;import ie.omk.debug.Debug;/** 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(ESME_QRYLINK);    }    /** Construct a new EnquireLink with specified sequence number.      * @param seqNum The sequence number to use      * @deprecated      */    public EnquireLink(int seqNum)    {	super(ESME_QRYLINK, seqNum);    }    /** Read in a EnquireLink from an InputStream.  A full packet,      * including the header fields must exist in the stream.      * @param in The InputStream to read from      * @exception java.io.IOException if there's an error reading from the      * input stream.      */    public EnquireLink(InputStream in)	throws java.io.IOException, ie.omk.smpp.SMPPException    {	super(in);	if (getCommandId() != SMPPPacket.ESME_QRYLINK)	    throw new BadCommandIDException(SMPPPacket.ESME_QRYLINK,		    getCommandId());    }    /** Return the number of bytes this packet would be encoded as to an      * OutputStream.      * @return the number of bytes this packet would encode as.      */    public int getCommandLen()    {	return (getHeaderLen());    }    /** 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");    }}