[rules-users] list operations in "then" part

[Simon Chen]

2011/6/2 Wolfgang Laun <wolfgang.laun at gmail.com>:
> On 1 June 2011 21:43, Simon Chen <simonchennj at gmail.com> wrote:
>>
>> Hi all,
>>
>> I am always confused about what we can do in the "then" part of the rule.
>>
>> In particular, I have problem duplicate a list. For example:
>>
>> when:
>>  $b: Book( "james" memberOf authors )
>> then:
>>  Test fact = new Test();
>>  fact.getList().addAll( $b.authors );
>>  insert(fact);
>> end
>>
>> The error message reads like this:
>>
>> BuildError: Unable to build expression for 'consequence': [Error:
>> Failed to compile: 2 compilation error(s):
>>  - (1,7) unqualified type in strict mode for: $b
>>  - (1,12) unqualified type in strict mode for: authors]
>>
>> What is the right way to do this?
>
> Granted - the error message is a puzzle in itself, but basically, the RHS
> must be written according to Java rules. Hence, if $b is an object of type
> Book, $b.authors depends on the (Java!) visibility of member authors. If it
> isn't public, you must use the getter.

I always have the variables "protected" and use public getters. For
other variables, $b.xxx just works, as long as getXxx() exists. But
for $b.authors, even if I have getAuthors() there, it still doesn't
work. That's why I'm suspecting something wrong with the list - the
only difference is that authors is an EList object...

Still don't know why...

-Simon

>
> -W
>
>>
>> Thanks.
>> -Simon
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>
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