[rules-users] Retriving an Object Array in the when clause of a rule.

[Wolfgang Laun]

See below.

On 18/06/2012, Amal Gupta <Amal_Gupta at infosys.com> wrote:
> Hi All,
>
> Is there a way to retrieve an object array from a Class getter in the when
> clause of a rule in a drl file ?  I have tried a lot of things but they did
> not work out.

What about reading the Expert manual? Did you try that?

[snip]

> rule "SourceSystemId = value"
>
>     when
>
>             c: EightColumnGenericClass()
>             Object[] columns: c.getColumn1();

This is incorrect syntax: you cannot declare an array to bind to
("columns"), and you cannot simply use an arbitrary expression to be
bound to a variable.

>             for (Object o : columns)
>             {
>                   System.out.println(o.toString());
> # The condition I want here is - if (o.toString()=="1794")
>             }

You most certainly can't use for or similar action statements on the LHS!


>     then
>
>         #RHS Code
> end
>
> Is there a way to achieve this?  Or is there something missing with my DRL
> file?  Please assist.
>

rule x
when
    $c: EightColumnGenericClass()
    $o: Object() from $c.getColumn1()
    eval( $o.toString().equals( "1794" ) )
then
   ...
end

-W