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127 lines
3.2 KiB
Java
127 lines
3.2 KiB
Java
// MUXPdu.java
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package protocol; // protocol package
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import support.*; // import Jasper support classes
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/**
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This is the class that defines (de)multiplexer protocol messages.
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@author Kenneth J. Turner
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@version 1.0 (23rd July 2010, KJT): initial version
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*/
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public class MUXPdu extends PDU {
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/** Protocol PDU type */
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public final static String BLANK = "-";
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/** Protocol PDU type */
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public final static String TYPE = "DT";
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/** Protocol SDU list */
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private String sduList[];
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/**
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Constructor for a (de)multiplexer PDU for the required number of SDUs.
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*/
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public MUXPdu() {
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super(TYPE); // construct with type
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sduList = new String[MUXService.serviceCount]; // initialise SDU list
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}
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/**
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Get the PDU list of SDUs as a comma-separated string.
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@return comma-separated list of SDUs
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*/
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public String getData() {
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String dataList = ""; // initialise SDU data list
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for (int i = 0; i < sduList.length; i++) { // go through SDU data
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if (i > 0) // not first SDU?
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dataList += ","; // append a comma
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String data = sduList[i]; // get SDU data
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if (data == null) // SDU data missing?
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data = BLANK; // set data blank
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dataList += data; // append SDU data
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}
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return(dataList); // return SDU data list
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}
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/**
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Return the label for an arrow representing a (de)multiplexer PDU in a time
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sequence diagram.
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@return PDU label
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*/
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public String getLabel() {
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String label; // declare protocol label
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if (MUXProtocol.protocolMode) { // asynchronous?
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int first = firstSDU(); // get first SDU label
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if (first >= 0) // first SDU known?
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label = first + "," + sduList[first]; // set first index and data
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else // first SDU unknown
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label = "?,?"; // set unknown index and data
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}
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else // synchronous
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label = getData(); // set type and SDU data list
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label = type + "(" + label + ")"; // set protocol label
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return(label); // return protocol label
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}
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/**
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Return SDU for given entity.
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@param entity entity index
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@return SDU (or null if no such entity)
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*/
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public String getSDU(int entity) {
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return(0 <= entity && entity < sduList.length ? sduList[entity] : null);
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}
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/**
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Return SDU list.
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@return SDU list
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*/
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public String[] getSDUs() {
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return(sduList);
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}
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/**
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Return index of first available SDU.
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@return index of first available SDU (-1 means none)
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*/
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public int firstSDU() {
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int index = -1; // initialise index
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for (int i = 0; i < sduList.length; i++) { // go through SDU data
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if (sduList[i] != null) { // data present?
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index = i; // note data available
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break; // leave loop
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}
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}
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return(index); // return index
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}
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/**
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Convert PDU to string.
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@return PDU as string
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*/
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public String toString() {
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return("PDU <Type " + type + ", Data <" + getData() + ">>");
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}
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/**
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Set source SDU data.
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@param source source entity index
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@param sdu source data
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*/
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public void setSDU(int source, String sdu) {
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sduList[source] = sdu; // set SDU data for source
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}
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}
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