2012/2/9 <[email protected]> > Beautiful! > > How would a business user (non-programmer) write such a rule. > There's some evidence that it's difficult to "un-think" your procedural programming imprinting. A non-programmer might even have the edge over a programmer.
But rule programming isn't a silver bullet - lots of stuff to learn. The only way I can think of is create a dsl sentence for this specific > condition > Even so. -W > ------------------------------ > > * From: *Wolfgang Laun [[email protected]] > * Sent: *02/09/2012 05:02 PM CET > * To: *Rules Users List <[email protected]> > * Subject: *Re: [rules-users] How do I write a rule to detect a missing > value in a group of facts? > > Don't think procedurally, just write the *rule* for a missing post ;-) > > rule "missing fence post" > when > FencePost( $d: distanceFromStart ) > FencePost( distanceFromStart == $d + 2*FencePost.GAP ) > not FencePost( distanceFromStart == $d + FencePost.GAP ) > then > System.out.println( "Missing: " + ($d + FencePost.GAP) ); > end > > -W > > On 9 February 2012 16:41, mikeg <[email protected]> wrote: > >> I need to write a rule to identify a missing element in a group of facts. >> >> For example, let us say I want to ensure that my fence has a fence post >> every 8 feet. My fact declaration is as follows: >> >> declare FencePost >> identifier : String >> distanceFromStart: Long >> end >> >> If I add the following facts into my session: >> >> FencePost("a", 0) >> FencePost("x", 8) >> FencePost("e", 24) >> >> I want a rule that will notify the user that there is a missing fence post >> between "x" and "e". >> >> I've been looking into using "collect" into a TreeSet/TreeMap to get a >> collection sorted on the "distanceFromStart", but I cannot figure out how >> to >> compare adjacent elements in the collection. >> >> Any ideas? >> >> -- >> View this message in context: >> http://drools.46999.n3.nabble.com/How-do-I-write-a-rule-to-detect-a-missing-value-in-a-group-of-facts-tp3729818p3729818.html >> Sent from the Drools: User forum mailing list archive at Nabble.com. >> _______________________________________________ >> rules-users mailing list >> [email protected] >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > ----------------------------------------- The information contained in > this communication (including any attachments hereto) is confidential and > is intended solely for the personal and confidential use of the individual > or entity to whom it is addressed. If the reader of this message is not the > intended recipient or an agent responsible for delivering it to the > intended recipient, you are hereby notified that you have received this > communication in error and that any review, dissemination, copying, or > unauthorized use of this information, or the taking of any action in > reliance on the contents of this information is strictly prohibited. If you > have received this communication in error, please notify us immediately by > e-mail, and delete the original message. Thank you > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > > > ----------------------------------------- > The information contained in this communication (including any > attachments hereto) is confidential and is intended solely for the > personal and confidential use of the individual or entity to whom > it is addressed. If the reader of this message is not the intended > recipient or an agent responsible for delivering it to the intended > recipient, you are hereby notified that you have received this > communication in error and that any review, dissemination, copying, > or unauthorized use of this information, or the taking of any > action in reliance on the contents of this information is strictly > prohibited. If you have received this communication in error, > please notify us immediately by e-mail, and delete the original > message. Thank you > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > >
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