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Add class methods and attributes to LotusScript 
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: 22
: 22
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: Domino Designer
: LotusScript, OOP
: Thomas Bahn3669 03 Nov 2007
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In other OO programming languages, there are class methods and attributes. These members are shared by all objects of the class.
 
In Java, these members are flagged by the "static" modifier before the identifier.
 
Class methods can be called on the class itself without the need for an object.
 
They are essential for some class "self-management" capabilities, like counting the instances of a class or having a list of all created objects.
 
Class members are necessary for the common Singleton design pattern and useful for object pools (like database connections).



1) Kenneth Axi1694 (04 Aug 2011)
Hmmm... I don't quite understand this request...

"Method" is called Sub or Function in LS
"Attributes" are called Property in LS

To be able to call a Method/Function without a class/object - place it in the scriptlibrary outside the function and all classes can call it without any object.

Or what am I missing here?
2) Thomas Bahn3669 (05 Aug 2011)
You miss the difference between class and instance members. ;-)

In LotusScript you only have instance members (Sub, Function, Property, Dim), but no class members.

If you want, e.g. count the objects created using a certain class, you need to have a common variable = attribute for all objects, not one for each object.

This could be the code, if LotusScript had class members:

Class Car
Static Dim carsTotal As Integer ' class attribute, static is the modifier used in Java

Public Sub New()
carsTotal = carsTotal + 1
End Sub

Static Function GetCarsTotal As Integer ' class method
GetCarsTotal = carsTotal
End Function
End Class

Class members could be used for central logging of object creation and destruction, object pools, central caching etc.

Have a look at common design patterns, especially Creator/Builder patterns for more use cases of class members.
3) Kenneth Axi1694 (05 Aug 2011)
Ah - now I understand...! Always good to show with example code.
Ok - You got my vote!










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