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On 23/02/2012 03:38, Hezi Stern wrote:
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<div class="WordSection1">
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am seeking some kind of filtering (if
statement) inside the LHS.<o:p></o:p></p>
<p class="MsoNormal">I have the following example rule (note: <span
style="font-size:10.0pt;font-family:"Courier
New";color:black">$attributeFilteredSentences and
$cmdescriptor are defined in the extends rule which is not
presented)</span>:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span
style="font-size:10.0pt;font-family:"Courier
New";color:#960000">rule</span></b><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> </span><span
style="font-size:10.0pt;font-family:"Courier
New";color:green">" choose message sentence example"</span><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> extends "
attributeFilteredSentences collection"</span><span
style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> </span><b><span
style="font-size:10.0pt;font-family:"Courier
New";color:#960000">when</span></b><span
style="font-size:10.0pt;font-family:"Courier
New";color:black">
</span><span style="font-size:10.0pt;font-family:"Courier
New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black">
</span><span style="font-size:10.0pt;font-family:"Courier
New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black">
SContextState(state == SContextState.ONE)</span><span
style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> </span><span
style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> $sentences:
ArrayList()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> </span><b><span
style="font-size:10.0pt;font-family:"Courier
New";color:#960000">from</span></b><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> </span><b><span
style="font-size:10.0pt;font-family:"Courier
New";color:#960000">collect</span></b><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> (Sentences.Sentence(</span><span
style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black">
descriptor.meanings.meaning ==
$cmdescriptor.meanings.meaning</span><span
style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black">
) </span><b><span
style="font-size:10.0pt;font-family:"Courier
New";color:#960000">from</span></b><span
style="font-size:10.0pt;font-family:"Courier
New";color:black">
$attributeFilteredSentences)
</span><span
style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> </span><span
style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> </span><b><span
style="font-size:10.0pt;font-family:"Courier
New";color:#960000">then</span></b><span
style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"> logger.info(</span><span
style="font-size:10.0pt;font-family:"Courier
New";color:green">"RULE: entered rule: "</span><span
style="font-size:10.0pt;font-family:"Courier
New";color:black">+drools.getRule().getName());<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-indent:.5in"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black">//some logic…<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;text-indent:.5in"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><b><span
style="font-size:10.0pt;font-family:"Courier
New";color:#960000">end<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span
style="font-size:10.0pt;font-family:"Courier
New";color:#960000"><o:p> </o:p></span></b></p>
<p class="MsoNormal">as can be seen I am filtering sentences
based on the meanings, and the meaning collection must be
identical as in <span
style="font-size:10.0pt;font-family:"Courier
New";color:black">$cmdescriptor (this is the case when
SContextState.ONE)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal">Now to my question: I have cases ((this is
the case when SContextState.TWO) where I do not need exact
validation but rather superset of (for this I have a
supersetOf operator implemented)<o:p></o:p></p>
<p class="MsoNormal">I would like to avoid duplicating this
rule (as I have similar condition in many other rules) and
being able to filter once with “==” and once with “supersetOf”
depending on the SContextState.</p>
</div>
</blockquote>
I have found that query's can be used to provide re-usable rule
fragments. In the example below I could have inlined the intentory
LHS in the updateInventory rule, but instead I separated it out into
a query so that multiple rules can re-use it. There is a small
performance overhead from using queries, compared to normal
patterns, but in most cases this is compensated by more maintainable
and readable code.<br>
<br>
<pre><div style="background-color: transparent;" class="line" id="LC42">query inventory(Character $char, List $inventory) </div><div style="background-color: transparent;" class="line" id="LC43"> $char := Character() </div><div style="background-color: transparent;" class="line" id="LC44"> $inventory := List() from accumulate( Holding( $char, $thing; ),</div><div style="background-color: transparent;" class="line" id="LC45"> collectList( $thing ) ) </div><div style="background-color: transparent;" class="line" id="LC46">end</div></pre>
<pre><div class="line" id="LC27">rule updateInventory salience 5 when </div><div class="line" id="LC28"> SessionCharacter( $char : character, $us : session ) </div><div class="line" id="LC29"> inventory( $char, $things; ) </div><div class="line" id="LC30">then</div><div class="line" id="LC31"> $us.channels["inventory"].send( $things ); </div><div class="line" id="LC32">end</div></pre>
<br>
Mark<br>
<blockquote
cite="mid:018701ccf1dc$aabb4300$0031c900$@delegatecom.com"
type="cite">
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<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any ideas how to do this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Hezi<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><o:p> </o:p></p>
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