Hi Mark,<br><br>>>
what you are using there is a return value constraint, to the engine
its effectively a black box, and is evaluated by the chosen dialect;
mvel or java. So if you want ot be able to do that type of arithmetic,
work with the MVEL author to make sure its incuded in his engine.<br><br>I think Mvel do support return value constraint, no?<br><br> <a href="http://docs.codehaus.org/display/MVEL/Basic+Syntax">http://docs.codehaus.org/display/MVEL/Basic+Syntax
</a><br><br><br><div class="gmail_quote">On Dec 20, 2007 11:04 AM, Mark Proctor <<a href="mailto:mproctor@codehaus.org">mproctor@codehaus.org</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"><div class="Ih2E3d">
Andy Mei wrote:
<blockquote type="cite">Hi Edson, <br>
<br>
This is exactly what I am looking for, thanks!<br>
<br>
One comment, is it possible to expand on list of operators Drools
support? Better yet, make it plugable just like EvaluatorDefinition.<br>
</blockquote></div>
Not yet, this is something we want, but our current approach to using
antlr has limited our flexability there. We would need to rewrite the
grammar, using an antlr-tree parser, then we should be able to have
user definable list of operators.<div class="Ih2E3d"><br>
<blockquote type="cite"><br>
Correct me if I am wrong, but here are list of operators Drools
support:
<br>
<a href="http://anonsvn.labs.jboss.com/labs/jbossrules/trunk/drools-core/src/main/java/org/drools/base/evaluators/Operator.java" target="_blank">http://anonsvn.labs.jboss.com/labs/jbossrules/trunk/drools-core/src/main/java/org/drools/base/evaluators/Operator.java
</a><br>
<br>
Would it be possible if I could add additional operators like '+', '-',
'/', '%'... to any objects. For example, I would love to allow users
to write syntax below, where user could subtract 3 days from the
current day.
<br>
<br>
$p : Position ( settlementDate < ( $TODAY - '3D' ) )<br>
</blockquote></div>
what you are using there is a return value constraint, to the engine
its effectively a black box, and is evaluated by the chosen dialect;
mvel or java. So if you want ot be able to do that type of arithmetic,
work with the MVEL author to make sure its incuded in his engine.<div class="Ih2E3d"><br>
<blockquote type="cite"><br>
I love the project, keep up the good work. I am negotiating with
management to purchase support contract from Redhat.<br>
</blockquote></div>
great :)<br>
<blockquote type="cite"><div class="Ih2E3d"><br>
Andy<br>
<br>
<div class="gmail_quote">On Dec 19, 2007 6:26 PM, Edson Tirelli <<a href="mailto:tirelli@post.com" target="_blank">tirelli@post.com</a>>
wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
Andy,<br>
<br>
I just added support for that in trunk (drools-4.1.0.SNAPSHOT).
Although trunk is a work in progress, you are welcome to try it out and
check if it meets your needs and provide feedback. Look for the
interface: org.drools.base.evaluators.EvaluatorDefinition and its
subclasses as examples.<br>
<br>
[]s<br>
Edson<br>
<br>
<div><span class="gmail_quote">2007/12/19, Andy Mei <<a href="mailto:andy.d.mei@gmail.com" target="_blank">
andy.d.mei@gmail.com
</a>>:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<div>Hi,<br>
<br>
Is there a way I could register my own custom EvaluatorFactory?
<br>
Drools ships with DateFactory what compares only dates, but no time
is included. I would like to compare time as well.<br>
I see that it would be very helpful to include capability to register
custom EvaluatorFactory.
<br>
Thanks.<br>
<span><br>
Andy<br>
</span><br>
</div>
</div>
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</div>
<br>
<br clear="all">
<br>
-- <br>
Edson Tirelli<br>
JBoss Drools Core Development<br>
Office: +55 11 3529-6000<br>
Mobile: +55 11 9287-5646<br>
JBoss, a division of Red Hat @ <a href="http://www.jboss.com" target="_blank">
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