Adding this rule attribute will fire the rule only once. Still, you won't be able to tell from the two titles which one is the odd-man-out. Also, if there are two or more violations, it won't show either.<br><br>
rule "check-same"<br>
activation-group "one-shot"<br>
when<br>
...<br><br>Otherwise, duplicate firings for a pair can be eliminated by adding a constraint that reduces activations to a specific order of a pair; for this you'll need an attribute in your Fact that can be compared with '<', to wit:<br>
<br> $p1 : Fact( $n1 : num, $t1 : title, $g1 : groupNames, $p1 : propNames )<br> $p2 : Fact( num > $n1, $t2 : title, ( groupNames != $g1 || propNames != $p1 ) )<br><br>As for your question ("comparing sets"), I suggest that you write a simple wrapper class, say, class PropNameSet, with a single attribute Set<String> names. Then you might write rules such as<br>
<br>rule "make set"<br>
when<br>
$f1 : Fact( $p1 : propNames )<br> not PropNameSet() // not Set()<br>
then<br>
insert( new PropNameSet( $p1 ) ); // insert( $p1 );<br>
end<br><br>
rule "check-names"<br>
when<br> PropNameSet( $names : names ) // $names : Set()<br>
$f1 : Fact( $t1 : title, propNames != $names )<br>
then<br>
System.out.println( "mismatch " + $t1 );<br>
end<br>
<br>You could also use the indicated alternative with the raw Set as a fact, but there is a fairly obvious disadvantage: not Set() is a very general condition.<br><br>Note that the PropNameSet will be derived from an arbitrary Fact; thus the mismatch might occur repeatedly, and for the good ones.<br>
<br>-W<br><br><br><br><div class="gmail_quote">2009/5/15 Ian Spence <span dir="ltr"><<a href="mailto:ianspence@gmail.com">ianspence@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Wolfgang and all,<br><br>Your suggestion did work. Thank you for that. I am learning more as I go along.<br><br>I am thinking of another approach now. To populate working memory with a Set of all names "allNames"; call fireAllRules; then in the DRL, for each Title compare Proprietor names (set) with "allNames".<br>
<br>How can I compare 2 sets like this in a DRL ?<br><br>Ian Spence<br><br><div class="gmail_quote">2009/5/14 Wolfgang Laun <span dir="ltr"><<a href="mailto:wolfgang.laun@gmail.com" target="_blank">wolfgang.laun@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Assuming that your facts are structured as the indentation suggests, I would solve this using a technique you could call "virtual field". So, if a fact object has fields <br>
String title<br> List<PropGroup> pgList<br>
<br>and a PropGroup has fields<br> String name<br> List<String> pList<br><br>I would not try to get at the embedded data from the objects contained within List<PropGroup>. Rather, I'd add a couple of getters to your Fact class, each of which would return a Set<String> computed from the contained List<PropGroup>. Then the rule simply becomes<br>
<br>rule "check-same"<br> when<br> $p1 : Fact( $t1 : title, $g1 : groupNames, $p1 : propNames )<br> $p2 : Fact( this != $p1, $t2 : title, ( groupNames != $g1 || propNames != $p1 ) )<br> then<br>
System.out.println( "mismatch " + $t1 + " and " + $t2 );<br> end<br><br>Notice that this won't find the odd-man-out; it will fire twice for each unequal pair.<br><br>-W<div><div></div><div class="h5">
<br><br><br><div class="gmail_quote">
2009/5/14 Ian Spence <span dir="ltr"><<a href="mailto:ianspence@gmail.com" target="_blank">ianspence@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div></div><div>
<div class="gmail_quote"><div link="blue" vlink="purple" lang="EN-AU"><div><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"></span></font><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Hello all,</span></font>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">I am new to Drools…</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">I have a scenario</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Each fact object will have the structure:</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Title</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> Proprietor Group</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> Proprietor Name</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">E.g.</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
2100-100</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
J2 ˝ share</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
SMITH, JOHN</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
JONES, FRED</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
T ˝ share</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
BROWN, CHARLIE</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
2100-101</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
J2 ˝ share</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
BROWN, CHARLIE</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
JONES, FRED</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
T ˝ share</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
SMITH, JOHN</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
2100-102</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
T ˝ share</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
BROWN, CHARLIE</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
J2 ˝ share</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
JONES, FRED</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">
SMITH, JOHN</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">The group names and the proprietor names must be the same
across each Title. The scenario above is a valid case. A failed case would
result for Title 2100-100 if we add an extra Proprietor name e.g. WHITE, MARY.</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">I anticipate having one rule to cater for this. I am
hedging towards the ‘collect’ operator but cannot get a clear
picture on how to implement it.</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"><br></span></font></p></div>-- <br></div>
</div>Regards,<br><font color="#888888">Ian Spence<br><br><br>
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<br></div></div></blockquote></div><br><br clear="all"><br>-- <br>Regards,<br><font color="#888888">Ian Spence<br><br><br>
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