I think Mike Coburn wrote:
> Hi Jess-Users,
>
> >From the following snippet:
>
> Rete engine = new Rete();
>
> Value val = engine.executeCommand("(facts)");
>
> how can I get the result of the jess command (facts) for example,
> but really from any command, as a string or stringbuffer in order
> to parse the result?
All Jess functions have a return value (which is the Value you get
from executeCommand above,) and some Jess functions also print output
to the screen. In the case of "facts" the return value is always TRUE
(not interesting) and the list of facts is printed.
You can capture what Jess prints to the screen by redirecting the
standard I/O routers. Section 4.4.6 of the Jess manual talks about
this in detail. It can be as simple as
StringWriter writer = new StringWriter();
engine.addOutputRouter("WSTDOUT", writer);
Now the output of "facts" will end up in this StringWriter.
But it's rare that you actually want to do this just so you can parse
the output; most of the time the only reason to do it is to embed Jess
in a GUI and force the output to appear in a JTextArea or similar. The
reason it's rare is because it's silly to make Jess turn this
information into text, and then parse the text, when the information
is available directly from Jess in a more useful form. In the case of
the "facts" function, there's the method listFacts() in the Rete
class, which returns an Iterator over all the Fact objects in working
memory. Instead of doing the above, just call listFacts() and you have
the same information much more efficiently.
---------------------------------------------------------
Ernest Friedman-Hill
Science and Engineering PSEs Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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