Re: [rules-users] How to pass global variables to a function called in a condition

Conditions are evaluated when facts are inserted, modified and deleted. -W 2011/8/25 Matthew Erler <wires8(a)yahoo.com&gt; > In Drools 5 I'm passing in two global Date objects and need to find the > difference in days between them. I've discovered that the function > parameters (fromDate and toDate in my case) are null in the condition when > the function is called, but when the function is called in the consequence > they have values. I can see that because the output of the following rule > is: > fromDate is null > toDate is null > I'm in dateDiff and the date diff is: 14 > > I'm guessing that Drools doesn't make globals t available at the point > that I need them. Can anyone confirm this and offer a solution? > > Here is the rule file itself: > > import java.util.Date; > import org.joda.time.DateMidnight; > import org.joda.time.Days; > > global java.util.Date fromDate; > global java.util.Date toDate; > > > rule "dateDiff" > dialect "mvel" > when > eval(getDaysBetweenStartAndEndDate(fromDate, toDate) < 10) > then > System.out.println( "I'm in dateDiff and the date diff is: " > + getDaysBetweenStartAndEndDate(fromDate, toDate)); > end > > > function int getDaysBetweenStartAndEndDate(Date fromDate, Date toDate) { > if (fromDate==null) System.out.println("fromDate is null"); > if (toDate==null) System.out.println("toDate is null"); > return Days.daysBetween(new DateMidnight(fromDate), new > DateMidnight(toDate)).getDays(); > } > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users