[rules-users] Call class method from LHS of a rule

[Wolfgang Laun]

What you need is called "inline eval expression" (see the Drools Expert
manual),
or an eval conditional element. The first one might be written as:

$c:Cheese(type == "chedar", eval( this.existsInShop("shopName") ) )

-W


On Mon, Jan 4, 2010 at 12:49 PM, orchid <maya.pollack at gmail.com> wrote:

>
> Hi All,
>
> I'm trying to call a class method from the LHS of a rule in the following
> way:
>
> public class Cheese{
>  private string type;
>  //setters and getters
>  public boolean existsInShop(String shop){
>    ...
>    return true;
>  }
> }
>
> I would like to call the method "existsInShop" from a rule:
>
> Rule "Rule1"
>  when
>    $c:Cheese(type == "chedar", existsInShop "shopName")
>  then
>    System.out.println("Rule1 is fired");
> end
>
> I get the compilation error: "no viable alternative at input "shopName" in
> rule "Rule1" in pattern document". How can I call the method from the rule?
>
> Thanks in advance.
>
>
>
> --
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