<font size="2"><p>Beautiful!<br><br>How would a business user (non-programmer) write such a rule. The only way I can think of is create a dsl sentence for this specific condition<br></p></font><hr><font size="2"><p><b> From: </b>Wolfgang Laun [wolfgang.laun@gmail.com]<br><b> Sent: </b>02/09/2012 05:02 PM CET<br><b> To: </b>Rules Users List <rules-users@lists.jboss.org><br><b> Subject: </b>Re: [rules-users] How do I write a rule to detect a missing value in a group of facts?<br></p></font><br>
<div>Don't think procedurally, just write the *rule* for a missing post ;-)</div><div><br></div>rule "missing fence post"<div>when</div><div> FencePost( $d: distanceFromStart )</div><div> FencePost( distanceFromStart == $d + 2*FencePost.GAP )<br>
not FencePost( distanceFromStart == $d + FencePost.GAP )<br>then</div><div> System.out.println( "Missing: " + ($d + FencePost.GAP) );</div><div>end</div><div><br></div><div>-W<br><br><div class="gmail_quote">
On 9 February 2012 16:41, mikeg <span dir="ltr"><<a href="mailto:mike@thegoldners.com">mike@thegoldners.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I need to write a rule to identify a missing element in a group of facts.<br>
<br>
For example, let us say I want to ensure that my fence has a fence post<br>
every 8 feet. My fact declaration is as follows:<br>
<br>
declare FencePost<br>
identifier : String<br>
distanceFromStart: Long<br>
end<br>
<br>
If I add the following facts into my session:<br>
<br>
FencePost("a", 0)<br>
FencePost("x", 8)<br>
FencePost("e", 24)<br>
<br>
I want a rule that will notify the user that there is a missing fence post<br>
between "x" and "e".<br>
<br>
I've been looking into using "collect" into a TreeSet/TreeMap to get a<br>
collection sorted on the "distanceFromStart", but I cannot figure out how to<br>
compare adjacent elements in the collection.<br>
<br>
Any ideas?<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
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