Thanks for answer. I will look for info about eval (Expert User Guide - I know where ;) ) But, even, if this works, what with Guvnor, and GUI based rule constructor? How can I do it with Guvnor GUI?<br><br><div class="gmail_quote">
2010/8/6 Swindells, Thomas <span dir="ltr"><<a href="mailto:TSwindells@nds.com">TSwindells@nds.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Have you looked at eval()?</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;" lang="EN-US">From:</span></b><span style="font-size: 10pt;" lang="EN-US"> <a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank">rules-users-bounces@lists.jboss.org</a> [mailto:<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank">rules-users-bounces@lists.jboss.org</a>]
<b>On Behalf Of </b>tom ska<br>
<b>Sent:</b> 06 August 2010 10:49<br>
<b>To:</b> <a href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a><br>
<b>Subject:</b> [rules-users] Math calculations on attributes in WHEN section of rules.</span></p>
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<p class="MsoNormal">Hello,<br>
what I want to do, is to calculate on object's attributes in WHEN section of rule. Can I do it?<br>
<br>
For example:<br>
<br>
class CObj<br>
{<br>
private int k;<br>
private int n;<br>
<br>
// setters and getters<br>
}<br>
<br>
Now what I want to do is:<br>
<br>
rule "r1"<br>
when<br>
p : CObj ( k + n <= 1000)<br>
then<br>
System.out.println("We love Drools :)");<br>
end<br>
<br>
Why can't I construct conditions like in Java, or C++ (with calculations in conditions)? How can I achieve my goal?<br>
<br>
Thx,<br>
Tom.</p>
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