[news.eclipse.modeling.gmf] Re: Ocl question- check string is an integer

["Christian W. Damus" <cdamus@xxxxxxxxxxxxx>]

Hi, Achilleas,

Try this:

  not self.value.toInteger().oclIsInvalid()

This should check that conversion from String to Integer is feasible.

cW

Achilleas wrote:
> Hi,
>
> I would like to ask if there is any way to check if a String is an 
> Integer using an Ocl constraint.
>
> For example in java you can do something like:
> 1. Integer.parseInt(myString) and catch the exception or  2. boolean 
> isInteger = Pattern.matches("^\d*$", myString)
>
> Is there any way to perform something similar to the above in OCL?
> I tried to use something like self.value.oclIsTypeOf(Integer) but the 
> oclIsTypeOf property deals with the direct type of an object.
> e.g. context Person
>          inv: self.oclIsTypeOf( Person ) -- is true
>          inv: self.oclIsTypeOf( Company) -- is false
>
> I tried to use something like self.value.oclIsKindOf(Integer) but the 
> oclIsKindOf property determines whether value is either the direct type 
> or one of the supertypes of an object.
>
> Any suggestions how this can be done?
>
> Thanks,
>
> Achilleas