/** * JWAP - A Java Implementation of the WAP Protocols * Copyright (C) 2001-2004 Niko Bender * * 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 */package net.sourceforge.jwap.wtp.pdu;import net.sourceforge.jwap.util.BitArrayOutputStream;/** * This Class represents an Acknowledgement PDU. * According to the WTP specification in section 8 this PDU * can be encoded into a byte array. * <br><br> * 3 bytes are used. You can not input payload of upper layers. * To encode the PDU call toByteArray(). * <br><br> * There are to ways of creation: <b>Either</b> you construct a Object * manually by calling the constructor <b>or</b> you use CWTPFactory * to decode a byte Array. */public class CWTPAck extends CWTPPDU {    /**     * Tve/Tok Flag     * responder -> initiator: "do you have outstanding transactions with this TID?"     * initiator -> resopnder: "I have outstanding transaction(s) with this TID!"     */    private boolean tve_tok;    /**     * @param TID the Transaction ID according to the spec     */    public CWTPAck(int TID) {        super(TID, PDU_TYPE_ACK);        tve_tok = false;    }    /**     * encodes the PDU according to the WTP spec     *     * @return encoded bytes     */    public byte[] toByteArray() {        BitArrayOutputStream result = new BitArrayOutputStream();        result.write(CON);        result.write(pduType, 4);        result.write(tve_tok);        result.write(RES1);        result.write(RID);        result.write(TID, 16);        if (payload != null) {            result.write(payload);        }        //    logger.debug(result.toString());        return result.toByteArray();    }    /////////////////////////////////////////////////////////////////////////////    //////////////////////////////// GET/SET ////////////////////////////////////    public boolean getTve_tok() {        return tve_tok;    }    public void setTve_tok(boolean tve_tok) {        this.tve_tok = tve_tok;    }    /////////////////////////////////////////////////////////////////////////////    //////////////////////////////// HELPERS ////////////////////////////////////    /**     * constructs a string representation of the object     * invluding all fields.     *     * @return The constructed String with debug information     */    public String toString() {        String result = "";        result += ("CON:      " + CON + System.getProperty("line.separator") +        "pduType:  " + pduType + System.getProperty("line.separator") +        "tve_tok:  " + tve_tok + System.getProperty("line.separator") +        "RES1:     " + RES1 + System.getProperty("line.separator") +        "RID:      " + RID + System.getProperty("line.separator") +        "TID:      " + TID + System.getProperty("line.separator") +        System.getProperty("line.separator") + "ENCODED:" +        System.getProperty("line.separator") +        BitArrayOutputStream.getBitString(toByteArray()));        return result;    }    /**     * Test method     * @param args ignored     */    public static void main(String[] args) {        CWTPAck a = new CWTPAck((short) 7576);        a.toByteArray();        System.out.println(a.toString());    }}