You cannot bind a variable to a function result, as in "$word : hasForbiddenWordsSet( ... )".

I'd use the original boolean function hasForbiddenWordsSet (which might even include the check against getTitle() returning null), and add another function, returning the string, to be called after 'then'.

The first one could be implemented by calling the second one, and comparing the result to null. Since you probably expect that there aren't too many "forbidden" words in titles, the performance hit of calling the second one twice for each firing should be tolerable.

-W


2009/9/9 Leandro Carvalho <leandrodcarvalho@gmail.com>
Hi! I'm new here and a have a doubt about rules and functions in Drools.

I have this rule:

rule "ProductDescription validation"
    when
        $listing : Listing( $description:productDescription != null )
        eval( $description.getTitle() != null )
        eval( hasForbiddenWordsSet( wordsSet, $description.getTitle() ) )
    then
        System.out.println("ERROR!");
end

And this function:

function boolean hasForbiddenWordsSet(Set wordsSet, String value) {
#do something useful here
}


And everything works fine. But now I want that function "hasForbiddenWordsSet" return a String. For example to print at "then".
I tried something like this:

rule "ProductDescription validation"
    when
        $listing : Listing( $description:productDescription != null )
        eval( $description.getTitle() != null )
        $word : hasForbiddenWordsSet( wordsSet, $description.getTitle() )
    then
        System.out.println("ERROR: " + word);
end

function String hasForbiddenWordsSet(Set wordsSet, String value) {
#do something useful here
}

But it doesn't work, tried some other things and still no success.

Could someone help me?

Thanks in advance.

--
Leandro Carvalho

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