OCLOperators casetruefalse
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This is a new compact form to write : | This is a new compact form to write: | ||
if somebool then | if somebool then | ||
someexpressionwithtypeX | someexpressionwithtypeX | ||
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someOtherexpressionwithtypeX | someOtherexpressionwithtypeX | ||
endif | endif | ||
This operator enables you to write the same thing as | This operator enables you to write the same thing as: | ||
somebool.casetruefalse(someexpressionwithtypeX,someOtherexpressionwithtypeX) | somebool.casetruefalse(someexpressionwithtypeX,someOtherexpressionwithtypeX) | ||
===== | ===== Usage in EAL ===== | ||
If you want to execute methods in a case/switch -like statement. | If you want to execute methods in a case/switch-like statement. | ||
This makes a switch like construct look like this: | This makes a switch-like construct look like this: | ||
let x=SomeObject.SomeEnum in | let x=SomeObject.SomeEnum in | ||
( | ( | ||
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) | ) | ||
===== | ===== 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 | 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(#New).caseTrueFalse('New/Ordering', String.nullValue)+ | ||
self.oclIsInState(#Waiting).caseTrueFalse('Waiting', String.nullValue)+ | self.oclIsInState(#Waiting).caseTrueFalse('Waiting', String.nullValue)+ | ||
self.oclIsInState(#Ordered).caseTrueFalse('Ordered', String.nullValue))-> | self.oclIsInState(#Ordered).caseTrueFalse('Ordered', String.nullValue))-> | ||
collect(s| s.notNull.caseTrueFalse(s, self.State))->first | 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. | 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 [[OCLOperators_whentrue]] | ||
[[Category:OCLOperators]] | [[Category:OCLOperators]] | ||
Revision as of 08:11, 2 March 2023
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
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