Re: [rules-users] list operations in "then" part
2011/6/2 Wolfgang Laun <wolfgang.laun(a)gmail.com>:
On 1 June 2011 21:43, Simon Chen <simonchennj(a)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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