Using <span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap">Wolfgang's inline eval epression, I get the following error: "Cannot use this in a static context" when compiling the rule. I changed</span><div>
<span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap">"this" by "$c" and it works. I don't know why we are in a static context.</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap"><br>
</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap">The rule that worked for me is:</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap"><br>
</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap"><span class="Apple-style-span" style="white-space: normal; ">Rule "Rule1"<br> when<br> $c:Cheese(type == "chedar", eval($c.existsInShop ("shopName"))<br>
then<br> System.out.println("Rule1 is fired");<br>end<br></span></span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap"><br></span></div><div>
<span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap">I attached a working test case. Change $c to "<i>this" </i>in rule's condition and you will see the error I mentioned. </span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap"><br></span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap">Best, </span><div>
<span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap"><span style="border-collapse:separate;font-family:arial;white-space:normal;font-size:small"><br>
</span></span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse;white-space:nowrap"><span style="border-collapse:separate;font-family:arial;white-space:normal;font-size:small">2010/1/4 Wolfgang Laun <span dir="ltr"><<a href="mailto:wolfgang.laun@gmail.com" target="_blank">wolfgang.laun@gmail.com</a>></span></span></span><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">What you need is called "inline eval expression" (see the Drools Expert manual),<br>or an eval conditional element. The first one might be written as:<br>
<br>$c:Cheese(type == "chedar", eval( this.existsInShop("shopName") ) )<br><font color="#888888">
<br>-W</font><div><div></div><div><br><br><br><div class="gmail_quote">On Mon, Jan 4, 2010 at 12:49 PM, orchid <span dir="ltr"><<a href="mailto:maya.pollack@gmail.com" target="_blank">maya.pollack@gmail.com</a>></span> 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>
Hi All,<br>
<br>
I'm trying to call a class method from the LHS of a rule in the following<br>
way:<br>
<br>
public class Cheese{<br>
private string type;<br>
//setters and getters<br>
public boolean existsInShop(String shop){<br>
...<br>
return true;<br>
}<br>
}<br>
<br>
I would like to call the method "existsInShop" from a rule:<br>
<br>
Rule "Rule1"<br>
when<br>
$c:Cheese(type == "chedar", existsInShop "shopName")<br>
then<br>
System.out.println("Rule1 is fired");<br>
end<br>
<br>
I get the compilation error: "no viable alternative at input "shopName" in<br>
rule "Rule1" in pattern document". How can I call the method from the rule?<br>
<br>
Thanks in advance.<br>
<font color="#888888"><br>
<br>
<br>
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