[rules-users] strict-mode and nested object property access in drools 5.4.0.Final - can i cast?

[Wolfgang Laun]

Try using the getter, Java style, rather than the simple field name.

-W


On 24/05/2012, radai rosenblatt <radai.rosenblatt at gmail.com> wrote:
> hello.
>
> I have the following 2 classes:
>
> public class ClassWithPayload {
>     private String key;
>     private Object payload;
>     // getters setters etc ommitted
> }
>
> public class PayloadClass {
>     public String someProp;
>     //getters setters etc ommitted
> }
>
> and im trying to get the following rule to compile:
>
> rule "Naive Payload Access"
> when
>    $container : ClassWithPayload(key == "someKey", (payload != null &&
> payload.someProp == "someValue"))
> then
>    System.err.println("boom");
> end
>
> which results in the following error:
> java.lang.AssertionError: Unable to Analyse Expression payload.someProp:
> [Error: unable to resolve method using strict-mode:
> java.lang.Object.someProp()]
> [Near : {... payload.someProp ....}]
>
> is there some way for me to cast payload.someProp to the proper class ?
> (PayloadClass in this case).
> this is a simplification of a bigger migration issue from drools 5.1 to 5.4
> so the payload property has to remain an Object in the general case.
>
> there's a casting syntax mentioned here
> (https://community.jboss.org/wiki/DroolsPatternLanguage) but i take it its
> not been implemented yet? (or maybe i just cant understand it properly?)
> i've tried this:
>
> rule "Naive Payload Access"
> when
>    $container : ClassWithPayload(key == "someKey", (payload != null &&
> payload.#PayloadClass(someProp == "someValue")))
> then
>    System.err.println("boom");
> end
>
> but it doesnt compile:
> java.lang.AssertionError: [8,51]: [ERR 101] Line 8:51 no viable alternative
> at input '(' in rule "Naive Payload Access"
> [0,0]: Parser returned a null Package
>
> and if i cant cast, how can i get this sort of rule to behave as it did in
> 5.1.1 ?
>
> thanks in advance for any assistance,
>
>     Radai.
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/strict-mode-and-nested-object-property-access-in-drools-5-4-0-Final-can-i-cast-tp4013373.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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