thanks, Ernest It works fine.
Sincerely, Gang >From: [EMAIL PROTECTED] >Reply-To: [EMAIL PROTECTED] >To: [EMAIL PROTECTED] >Subject: Re: JESS: Sample Codes? >Date: Mon, 20 May 2002 15:39:52 -0700 (PDT) > > >All of the polymorphic xxxValue() methods take a Context parameter, >but not all the implementations use them. Value has a number of >subclasses; VariableValue, FuncallValue, and FactIdValue are three of >them. If you have a VariableValue, then the value has to be looked up >in the Context. If you have a FuncallValue, the Context may similarly >be used to resolve variables before the function call is evaluated. If >you have a FactIDValue, however, the Context is ignored; the same is >true for a plain Value. > >If you know that a value doesn't need to be resolved (i.e., it's not a >VariableValue or a FuncallValue) then it's always safe to pass "null" >as the Context. A safe alternative if you're not sure is >Rete.getGlobalContext(). > > >I think Gang Liu wrote: > > Ernest > > > > thank you for replying my email in details. You suggestion is clear >enough > > exception the following point: > > It needs a context parameter for Rete.fetch().factValue(Context c). > > > > If FactIdValue is a view of the actual Fact and it is a simple >dereferencing > > using fetch().factValue(), do we need such a context parameter? How to >get > > that parameter? (It is a kind of lookup for me with a context. > > > > Anything, please let me know. > > > > thanks > > > > Gang > > > > > > > > > > >From: [EMAIL PROTECTED] > > >Reply-To: [EMAIL PROTECTED] > > >To: [EMAIL PROTECTED] > > >Subject: Re: JESS: Sample Codes? > > >Date: Sat, 18 May 2002 07:24:49 -0700 (PDT) > > > > > > > > >In Jess version prior to 6, a "Fact-ID" is an integer. In Jess 6, it's > > >a view of the actual Fact object: a jess.FactIdValue object. It > > >contains a reference to the Fact object itself. So when you bind a > > >fact to a variable, like this: > > > > > > ?v <- (some-fact) > > > > > >?v is now the Fact object, not just the number. (assert) returns the > > >Fact object, too. If you print a FactIdValue, You see something like > > >"<Fact-27>" . After using (store) in Jess with the return value of > > >(assert) you can just use fetch().factValue() to get the Fact object > > >-- just a simple dereferencing, no lookup. You're right, > > >findFactById(int) is indeed slow. But you don't need to use it. > > > > > >I think Gang Liu wrote: > > > > Right. We can write actions to return fact-id to main(). Then, >main() > > >can > > > > retrieve that fact by Rete.findFactByID(int id). I want to avoid >this > > > > because the doc claims that Rete.findFactByID(int id) is very slow. > > > > > > > > Sorry, maybe I don't get your points. > > > > > > > > I want to find a way of getting a handle of that fact in main(). So, >I > > >can > > > > retrive slot value by Fact.getSlotValue(java.lang.String slotname). > > > > > > > > Or, maybe there are some efficient ways you know. > > > > > > > > thanks > > > > > > > > Gang > > > > > > > > > > > > > > > > >From: [EMAIL PROTECTED] > > > > >Reply-To: [EMAIL PROTECTED] > > > > >To: [EMAIL PROTECTED] > > > > >Subject: Re: JESS: Sample Codes? > > > > >Date: Fri, 17 May 2002 17:40:42 -0700 (PDT) > > > > > > > > > >The return value of (assert) is a Value of type RU.FACT; you >extract > > > > >the Fact object with factValue(). > > > > > > > > > >I think Gang Liu wrote: > > > > > > > > > > > main() wants to receive that new fact created in > > > > > > rule's action and process it. > > > > > > > > > > > > We can use "store" and "fetch". But, is "Fact" supported as a >value? > > > > > > > > > > > > thanks > > > > > > > > > > > > Gang > > > > > > > > > > > > > > > > > > > >--------------------------------------------------------- > > > > >Ernest Friedman-Hill > > > > >Distributed Systems Research Phone: (925) 294-2154 > > > > >Sandia National Labs FAX: (925) 294-2234 > > > > >Org. 8920, MS 9012 [EMAIL PROTECTED] > > > > >PO Box 969 http://herzberg.ca.sandia.gov > > > > >Livermore, CA 94550 > > > > > > > > > > >-------------------------------------------------------------------- > > > > >To unsubscribe, send the words 'unsubscribe jess-users >[EMAIL PROTECTED]' > > > > >in the BODY of a message to [EMAIL PROTECTED], NOT to the list > > > > >(use your own address!) List problems? 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