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82 lines
2.1 KiB
Java
82 lines
2.1 KiB
Java
4 years ago
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// UDPProtocol.java (C) I. A. Robin, K. J. Turner 04/03/06
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package protocol;
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import java.util.*;
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import support.*;
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public class UDPProtocol implements ProtocolEntity {
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private ProtocolEntity peer;
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private UDPService user;
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private Vector userEvents;
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private Medium medium;
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private String name;
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public UDPProtocol(Medium m, String name) {
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this.name = name;
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medium = m;
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initialise();
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}
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public void initialise() {
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userEvents = new Vector();
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}
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public String getName() {
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return(name);
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}
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public void setPeer(ProtocolEntity peer) {
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this.peer = peer;
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}
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public void setUser(ProtocolEntity user) {
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this.user = (UDPService)user;
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}
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public Vector<ProtocolEvent> receivePDU(PDU pdu) {
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Vector<ProtocolEvent> events = new Vector<ProtocolEvent>();
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UDPMessage ud;
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String pduType = "";
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if (pdu != null) {
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pduType = pdu.type;
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int sp = ((UDPMessage)pdu).sourcePort;
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int dp = ((UDPMessage)pdu).destPort;
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if (pduType.equals("DatReq")) { // DatReq from user
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ud = new UDPMessage("DT", sp, dp, pdu.getSDU());
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transmitPDU(ud, peer);
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events.addElement(new ProtocolEvent(ProtocolEvent.TRANSMIT, ud));
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}
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if (pduType.equals("DT")) { // data PDU received
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ud = new UDPMessage("DatInd", sp, dp, pdu.getSDU());
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transmitPDU(ud, user);
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events.addElement(new ProtocolEvent(ProtocolEvent.DELIVER, ud));
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}
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}
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return(events);
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}
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public void transmitPDU(PDU pdu, ProtocolEntity dest) {
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pdu.setSource(this);
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pdu.setDestination(dest);
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if (dest == peer)
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userEvents = medium.receivePDU(pdu);
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else
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userEvents = user.receivePDU(pdu);
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}
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public Vector<String> getServices() {
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Vector<String> list = new Vector<String>();
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return(list);
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}
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public Vector<ProtocolEvent> performService(String s) {
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Vector<ProtocolEvent> events = new Vector<ProtocolEvent>();
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for (Enumeration e = userEvents.elements(); e.hasMoreElements(); )
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events.addElement((ProtocolEvent) e.nextElement());
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return(events);
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}
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}
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