Documentation:OCLOperators casetruefalse: Difference between revisions

OCLOperators casetruefalse

Latest revision as of 05:20, 13 February 2025

This page was created by Hans.karlsen@mdriven.net on 2021-12-03. Last edited by Stephanie@mdriven.net on 2025-02-13.

This is a new compact form to write:

if somebool then
  someexpressionwithtypeX
else
  someOtherexpressionwithtypeX
endif

This operator enables you to write the same thing as:

somebool.casetruefalse(someexpressionwithtypeX,someOtherexpressionwithtypeX)

Usage in EAL

If you want to execute methods in a case/switch-like statement.

This makes a switch-like construct look like this:

let x=SomeObject.SomeEnum in
(
  (x=#Enum1).casetruefalse(SomeObject.DoYourThing1,DoNothing);
  (x=#Enum2).casetruefalse(SomeObject.DoYourThing2,DoNothing);
  (x=#Enum3).casetruefalse(SomeObject.DoYourThing3,DoNothing)
)

Usage in OCL

If you want to derive a string based on a list of conditions and have an else-statement if none of the expressions were True:

(self.oclIsInState(#New).caseTrueFalse('New/Ordering', String.nullValue)+
 self.oclIsInState(#Waiting).caseTrueFalse('Waiting', String.nullValue)+
 self.oclIsInState(#Ordered).caseTrueFalse('Ordered', String.nullValue))->
collect(s| s.notNull.caseTrueFalse(s, self.State))->first

The collect construct at the end can when the result, and if null, do the "else" statement. Note! Parenthesis around the string concatenation.

See also: OCLOperators_whentrue

@@ Line 9: / Line 9: @@
   somebool.casetruefalse(someexpressionwithtypeX,someOtherexpressionwithtypeX)
-===== Usage in EAL =====
+==== Usage in EAL ====
 If you want to execute methods in a case/switch-like statement.
@@ Line 20: / Line 20: @@
   )
-===== Usage in OCL =====
+==== Usage in OCL ====
 If you want to derive a string based on a list of conditions and have an else-statement if none of the expressions were True:
   (self.oclIsInState(#New).caseTrueFalse('New/Ordering', String.nullValue)+
@@ Line 28: / Line 28: @@
 The collect construct at the end can when the result, and if null, do the "else" statement. '''Note'''! Parenthesis around the string concatenation.
-See also [[OCLOperators_whentrue]]
+'''See also:''' [[Documentation:OCLOperators whentrue|OCLOperators_whentrue]]
 [[Category:OCLOperators]]
-{{Edited|July|12|2024}}
+{{Edited|July|12|2025}}