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\section{TrafficData Class}
\begin{vdm_al}
-----------------------------------------------
-- Class: TrafficData
-- Description: TrafficData is the base for different types of
-- messages in the system.
-----------------------------------------------
--
-- class definition
--
class TrafficData
--
-- instance variables
--
instance variables
private dir: Types`Direction;
private pos: Position;
private message: MessageType;
private timeToLive : nat;
--
-- Types definition section
--
types
public MessageType = <LowGrip> | <Congestion> | <LeftTurn> | <RedLight>;
--
-- Operations definition section
--
operations
public TrafficData: MessageType * Position * Types`Direction ==> TrafficData
TrafficData(m,p,d) ==
(
pos := p ;
message := m;
dir := d;
timeToLive := time + Config`TrafficDataLifeTime;
);
public GetPosition: () ==> Position
GetPosition() ==
return pos;
public GetMessage: () ==> MessageType
GetMessage() ==
return message;
public GetDirection: () ==> Types`Direction
GetDirection() ==
return dir;
public Expired : () ==> bool
Expired() ==
return time >= timeToLive;
public ToString : () ==> seq of char
ToString() ==
return "traffic data reporting "
^ MessageTypeToString(message)
^ " moved " ^ Types`DirectionToString(dir)
^ " at " ^ pos.toString()
^ " with lifetime "
^ Printer`intToString(timeToLive - time);
--
-- Functions definition section
--
functions
public static MessageTypeToString : MessageType -> seq of char
MessageTypeToString(m) ==
(
cases m:
<LowGrip>-> "Low Grip",
<Congestion>-> "Congestion ",
<LeftTurn>-> "Left Turn",
<RedLight> -> "Red Light"
end
)
--
-- Values definition section
--
values
end TrafficData
\end{vdm_al}
\begin{rtinfo}
[TotalxCoverage]{vdm.tc}[TrafficData]
\end{rtinfo}
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