1.0 KiB
Shall Participants return with Starter?
Participants function takes a context as an input and returns
all the participants of this context. It should return the from
not the Starter unless Starter IS the from.
If we do include from (Starter in some cases) in Participant
we have to ensure that they are the first participant, even if it
is not at the left.
Currently LifelineLayer uses it to get implicitly declared
participants for the root context; FragmentXXX use it to get
all involved participants of a sub context.
Related logic is in ToCollector. We can initialise descendantTos
with from before walker.walk. We need to consider that from
may be included in participant declaration and even in group.
So onParticipant must overwrite that.
context has the knowledge of from. So far we only expose the
getInheritedFrom function. It will be convenient that it returns
from directly.
However, we also need the InheritedFrom and ProvidedFrom
to calculate the translateX for Interactions.