using variable as package/class name to call Class method

Question

Question

MARK PONGONIS · Apr 11

#ObjectScript #Caché

Is it possible to use a variable instead the actual class name when calling a class method?

Ex.

s var = "MyPackage.MyClass"

d ##class(var).Main()

Product version: IRIS 2021.1

$ZV: 2021.1.2

Discussion (6)2

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Julius Kavay · Apr 11

The other way is, to put the classname into a variable and

set var = "MyPackage.MyClass"
do $classmethod(var,"Main")
set x=$classmethod(var,"Othermethod",params)

// or, if you have an instance
set obj=##class(MyClass).%New()
do $method(obj,"Main")
set x=$method(obj,"Othermethod",params)

2 0

Robert Barbiaux · Apr 11

You can use $classmethod to invoke any class method, including %New, e.g.

set cls = "MyPackage.MyClass"
set obj = $classmethod(cls,"%New")

4 0

score 1 · Answer 1 · 2024-04-11T11:02:41-04:00

If your class is instantiable (i.e. not an abstarct class) then

set obj = ##class(MyPackage.MyClass).%New()
do obj.Main()
set x=obj.OtherMethod(parameter)

score 1 · Answer 2 · 2024-04-11T15:58:14-04:00

That works great, thanks! What about to instantiate a new object?

Ex.

s var = "MyClass"

s obj=##class(var).%New()

score 1 · Answer 3 · 2024-04-11T16:12:58-04:00

Robert Cemper · Apr 11

set var="MyClass"
execute "set obj=##class("_var_").%New()"

a bit dirty but matches your request

1 0

score 1 · Answer 4 · 2024-04-11T23:00:53-04:00

liu bo · Apr 11

you can use as following: s clsName = "MyClass" $System. s obj= $System.OBJ.New(clsName)

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