Set theory in selectors

[actifsource]

Writing actifsource templates you define one selector per context. A selector lets you navigate through your model starting from a resource of your meta model and following any relation.

In some complex cases you might need to combine the results from different paths using the set theory. At the moment we have implemented three different commands:

union (OR)
All elements reached through A.b orC.d.

A.b union C.d

AS_Union.png (2.64 KiB) Viewed 34229 times

intersect (AND)
Only elements which are reached through A.b and C.d.

A.b intersect C.d

AS_Intersect.png (2.57 KiB) Viewed 34229 times

except (AND NOT)
All elements which are reached through A.b without the ones reached through C.d.

A.b except C.d

AS_Except.png (1.53 KiB) Viewed 34229 times

String type system
Note that the result of any set action is always strongly typed. The returned type is the most common type of all involved types. If there is no inheritance hierarchy between the types the result is at least of type Resource or NamedResource.

Screenshot of an example using reverse navigation, type cast an the intersect command

AS_SetTheory.png (30.66 KiB) Viewed 34233 times

[actifsource]

There is a new else operator now for sets which behaves like expected:

else.png (32.75 KiB) Viewed 33201 times