This is a followup to a message I sent to the userlist about a week ago asking
if anyone had been able to retrieve the text form of a jess fact as a string,
given its fact id.
I am now able to get, as a java string, a fact. I made the
jess.Rete.findFactByID method public, and was able to make a call like:
(call (new jess.Fact (call (engine) findFactByID 0) (engine)) toString)
findFactByID will return a ValueVector from of a fact given the integer fact
ID. you can make it into a jess.Fact and then call the toString method. fine
fine fine.
But now, the big question.
How do I turn a variable that has been bound to a fact-ID into the
corresponding integer?
for example
(defrule foo ?x<-(foo ?)=>
(printout t
(call (new jess.Fact (call (engine) findFactByID ?x) (engine))
toString)
crlf)
)
this bombs out, because ?x is not an integer.
In reading the README.html file, I noticed that the definition of what a jess
variable is not all too clear. Originally, in section 2.7, it is stated that
a variable can refer to "an atom, number or string", but later when referring
to pattern bindings (2.15.1) it is stated that the variable is bound to a fact-id.
In calls to retract, there seems to be an implicit conversion because the
documentation states that retract takes integers as arguments, but it also
works with variables bound to fact-IDs. Additionally, calling (new
java.lang.Integer ?x) will fail if ?x is bound to a fact id.
anyway. I am confused and lost in a sea of "but all I want to do is be able
to call (facttostring <factid>) and have it return a string..."
Thanks for all the help,
Eric Eslinger
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