I am not sure exactly what you are trying to express with your example, but more likely than not, you'll be able to do what you are trying through the collect conditional element.<br><br>Something along the lines of this?<br>
<br>when <br> a: Answer($responses : responses)<br> java.util.ArrayList( size > 1 ) from collect (String(this == "a" || == "b" || == "c") from $responses)<br>then<br> System.out.println("Cannot have more than one response!");<br>
<br><div class="gmail_quote">On Fri, Aug 22, 2008 at 4:18 PM, David Cracauer <span dir="ltr"><<a href="mailto:dcracauer@earthlink.net" target="_blank">dcracauer@earthlink.net</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,<br>
I'm getting stuck on this and I'm hoping someone can help..<br>
I need to be able to check that a collection contains one, and only one item<br>
from another collection.<br>
<br>
Ideally, I would do something like this:<br>
<br>
a:Answer(responses contains one of ("a","b","c"));<br>
<br>
Is there a way do do this without resorting to evals or predicate<br>
expressions? (drools 4.07)<br>
<br>
Thanks,<br>
Dave<br>
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