Or, maybe you can intern() the String(s) that you created you can
probably find the problem. Maybe.
SDG
jco
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of [EMAIL PROTECTED]
Sent: Friday, October 10, 2003 7:57 PM
To: [EMAIL PROTECTED]
Subject: Re: JESS: Retractions through Rete object trouble!
Well, the thing to do ies to get an instance of both an apparently good
and bad Java string together, and compare them one character at a time,
like
String good = ...
String bad = ...
for (int i=0; igood.length(); ++i)
if (good.charAt(i) != bad.charAt(i))
System.out.println(DIFF: +
(int) good.charAt(i) + + (int) bad.charAt(i));
and see if you can figure out the mismatch that way.
I think Jordan Willms wrote:
Hi there.
I am communicating with the Jess engine using Java, and I've
noticed some altogether strange behaviour with Fact retractions (which
I have no doubt is my fault). I come to the mailing list as a last
resort.
I am quite experienced with Jess/Java integration, which is why this
problem
is very confusing to me.
Firstly, take the following retraction string, I run it in WinJess
with no problems :
(retract-string
(PropertyValue
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#hasDirectionality
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#AShok
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#DirectionalityPointSourc
e)
)
But, the same string, generated from a rdf file :
?xml version=1.0 encoding=ISO-8859-1?
rdf:RDF xmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns#;
xmlns:daml=http://www.daml.org/2001/03/daml+oil#;
xmlns:ns1=http://echo.iat.sfu.ca/owl/psychoacoustics.daml#;
xmlns:rdfs=http://www.w3.org/2000/01/rdf-schema#;
xmlns:xsd=http://www.w3.org/2000/10/XMLSchema#;
rdf:Description
rdf:about=http://echo.iat.sfu.ca/owl/psychoacoustics.daml#AShok;
ns1:hasDirectionality
/rdf:Description
/rdf:RDF
which looks exactly the same (here is my debug) window (does not
work?):
[echoEdit] Retract String: (retract-string
(PropertyValue
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#hasDirectionality
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#AShok
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#DirectionalityPointSourc
e)
)
when I do :
Value v = rete.executeCommand(retractString); // retractString is the
above
string
System.out.println(v.toString());
prints FALSE!
PART 3 : The real wierdness :
I put together the following code:
Rete rete = myThread.getJessEngine();
Value v = rete.executeCommand((retract-string
\(PropertyValue
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#hasDirectionality
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#AShok
System.out.println(value v : + v.toString());
// Prints out TRUE!
So, obviously something is wrong with the fact string that I am trying
to create from the RDF file. BUT -- IT'S EXACTLY THE SAME! So, why is
this happening?
Can anyone shed any light on this problem. I feel like I'm taking
crazy pills.
Thank you very much.
..Jordan Willms.
rdf:resource=http://echo.iat.sfu.ca/owl/psychoacoustics.daml#Directio
nality
PointSource /
http://echo.iat.sfu.ca/owl/psychoacoustics.daml#DirectionalityPointSou
rce)\
));
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-
Ernest Friedman-Hill
Distributed Systems ResearchPhone: (925) 294-2154
Sandia National LabsFAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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