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68 lines
1.6 KiB
Java
68 lines
1.6 KiB
Java
4 years ago
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// CSMAPdu.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 CSMA/CD protocol messages.
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@author Kenneth J. Turner
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@version 1.0 (27th July 2010, KJT): initial version
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*/
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public class CSMAPdu extends PDU {
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/** Protocol transmission finished PDU */
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public final static String FINISH = "FINISH";
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/** Protocol transmission collision PDU */
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public final static String JAM = "JAM";
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/** Protocol transmission started PDU */
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public final static String START = "START";
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/**
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Constructor for a CSMA/CD PDU for the given type and with the given SDU.
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@param type PDU type
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@param sdu PDU payload as SDU
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*/
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public CSMAPdu(String type, String sdu) {
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super(type, sdu); // construct PDU
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}
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/**
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Return the PDU description with destination and SDU, in a format such as
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"START(D1) to MAC 1".
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@return PDU description
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*/
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public String getDescription() {
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return(
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getLabel() + " to " + getDestination().getName());
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}
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/**
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Return the label for an arrow representing a CSMA/CD PDU in a time sequence
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diagram.
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@return PDU label
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*/
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public String getLabel() {
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return( // return PDU as string
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sdu == null || sdu.length() == 0 ? type : type + "(" + sdu + ")");
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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( // return PDU as string
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sdu == null || sdu.length() == 0 ? type : type + "(" + sdu + ")");
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}
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}
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