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18. Table-Driven Methods
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ID for Buoy Temperature Message Average Temperature (floating point) Temperature Range (floating point) Number of Samples (integer) Location (character string) Time of Measurement (time of day)
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ID for Buoy Drift Message Change in Latitude (floating point) Change in Longitude (floating point) Time of Measurement (time of day)
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ID for Buoy Location Message Latitude (floating point) Longitude (floating point) Depth (integer) Time of Measurement (time of day)
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Figure 18-3 Aside from the Message ID, each kind of message has its own format.
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If you used a logic-based approach, you d probably read each message, check the ID, and then call a routine that s designed to read, interpret, and print each kind of message. If you had 20 kinds of messages, you d have 20 routines. You d also have who-knows-how-many lower-level routines to support them for example, you d have a PrintBuoyTemperatureMessage() routine to print the buoy temperature message. An object-oriented approach wouldn t be much better: you d typically use an abstract message object with a subclass for each message type. Each time the format of any message changed, you d have to change the logic in the routine or class responsible for that message. In the detailed message above, if the average-temperature field changed from a floating point to something else, you d have to change the logic of PrintBuoyTemperatureMessage(). (If the buoy changed from a floating point to something else, you d have to get a new buoy!) In the logic-based approach, the message-reading routine consists of a loop to read each message, decode the ID, and then call one of 20 routines based on the message ID. Here s the pseudocode for the logic-based approach:
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18. Table-Driven Methods
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4 CROSS-REFERENCE This 5 low-level pseudocode is used
While more messages to read Read a message header Decode the message ID from the message header If the message header is type 1 then Print a type 1 message Else if the message header is type 2 then Print a type 2 message ... Else if the message header is type 19 then Print a type 19 message Else if the message header is type 20 then Print a type 20 message
6 for a different purpose than 7 the pseudocode you use for
8 routine design. For details on 9 designing in pseudocode, see
0 9, The Pseudocode 1 Programming Process.
The pseudocode is abbreviated because you can get the idea without seeing all 20 cases.
Object-Oriented Approach
If you were using a rote object-oriented approach, the logic would be hidden in the object inheritance structure, but the basic structure would be just as complicated:
While more messages to read Read a message header Decode the message ID from the message header If the message header is type 1 then Instantiate a type 1 message object Else if the message header is type 2 then Instantiate a type 2 message object ... Else if the message header is type 19 then Instantiate a type 19 message object Else if the message header is type 20 then Instantiate a type 20 message object End if End While
Regardless of whether the logic is written directly or contained within specialized classes, each of the 20 kinds of messages will have its own routine for printing its message. Each routine could also be expressed in pseudocode. Here s the pseudocode for the routine to read and print the buoy temperature message.
Print "Buoy Temperature Message" Read a floating-point value Print "Average Temperature" Print the floating-point value Read a floating-point value Print "Temperature Range"
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18. Table-Driven Methods
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Print the floating-point value Read an integer value Print "Number of Samples" Print the integer value Read a character string Print "Location" Print the character string Read a time of day Print "Time of Measurement" Print the time of day
This is the code for just one kind of message. Each of the other 19 kinds of messages would require similar code. And if a 21st kind of message was added, either a 21st routine or a 21st subclass would need to be added either way a new message type would require the code to be changed.
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