Hmm, ok thanks, I understand better now. However, jess.Userfunctions return Value's so is there anything I can do in that case to activate the type conversion? I tried Value.resolve() but that did not help.
On Wed, 30 Nov 2005 18:47:38 -0800 (PST), ejfried wrote > If you can a Java function from Jess, and that function returns a > java.lang.Boolean, then Jess will turn it into a Jess boolean value > (the symbols TRUE or FALSE, of type RU.SYMBOL). > > On the other hand, new Value(Boolean.TRUE) will give you a Value of > type RU.JAVA_OBJECT that contains a java.lang.Boolean object. No > matter what you hand to this constructor, Jess will always give you > an object of type RU.JAVA_OBJECT; no automatic conversions will be done. > > So since you know what you have, you can look at the options. The > most straightforward thing would just be to say > > (test ((ognl-get ?anObject "booleanProperty") booleanValue)) > > I'd be tempted to write an ognl-get-boolean function to make this a > little less ugly. > > I think erich.oliphant wrote: > [Charset iso-8859-1 unsupported, filtering to ASCII...] > > Hi, > > I'm trying to understand the type conversion model a bit better. I've > > written > > a Userfunction (ognl-get) that takes an object, and Object Graph Notation > > Language (OGNL) expresssion, and any additional variables. The OGNL > > evaluator > > returns a plain Object which I just wrap in a jess.Value "new Value(obj)" > > and > > return. It's been working great as we have a pretty complex domain model. > > > > However, I now have a situation where the function is returing a Boolean > > that > > I know is say 'true', i.e. > > -- > > (ognl-get ?anObject "booleanProperty") > > -- > > > > I assumed that the Jess type conversion would allow me to do something like > > -- > > (test (ognl-get ?anObject "booleanProperty")) > > -- > > implicity converting Boolean.TRUE to 'TRUE'. > > When that failed, I assumed that the plain object was returned so I tried > > -- > > (test (eq (ognl-get ?anObject "booleanProperty") (Boolean.TRUE))) > > -- > > this still does not seem to do it. > > > > I assume that I am making an incorrect assumption :) Any ideas ? > > > > -------------------------------------------------------------------- > > 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? Notify [EMAIL PROTECTED] > > -------------------------------------------------------------------- > > > > --------------------------------------------------------- > Ernest Friedman-Hill > Advanced Software Research 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 > > -------------------------------------------------------------------- > 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? Notify [EMAIL PROTECTED] > -------------------------------------------------------------------- -------------------------------------------------------------------- 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? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
