--- On Fri, 9/5/08, Michael Zimmermann <[EMAIL PROTECTED]> wrote:
> rule "MyRule"
> when
> book(year==myYear, author==myAuthor ...)
> then
> ....
>
> This works only if all properties myYear, myAuthor ... are
> present. If one is undefined, the rule does not match.
You could have a function that returns true if the properties match or the
property is null:
boolean matchesOrNull(Object o, Object p) {
return p == null ? true : ( o == null ? true : o.equals(p) );
}
Call it using eval in the conditions.
Maybe if it's useful enough an operator could be added to Drools that does the
same thing. "~=" maybe?
GreG
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