[rules-users] (no subject)

[Garner, Shawn]

Functions on the LHS are not advised and says so in the drools user guide.

I can think of two ways to do this (forgive me if my syntax is slightly off).

Way number 1

rule "ProductDescription validation"
    when
        $listing : Listing( $description:productDescription != null, description.title != null )
     then
	ListingScrubber listingScrubber = new ListingScrubber(listing);
	insert(listingScrubber);
end

rule "ProductDescription validation Part 2"
    when
        $listingScrubber : ListingScrubber(forbiddenWordInTitle == true , $title: productDescription.title)
    then
	String word = $listingScrubber.getWord();
        System.out.println("ERROR: " + word); 
end


Way number2

rule "ProductDescription validation"
    when
        $listing : Listing( $description:productDescription != null, $title : productDescription.title != null)              
    then
 	List<ListingWord> listingWordList =  listing.getListingWords();
 	Iterator<ListingWord> listingWordListIter = listingWordList.iterator();
 	while(listingWordListIter.hasNext())
 	{
 		ListingWord listingWord = listingWordListIter.next();
 		assert(listingWord);
 	}
 end
 
 $word : hasForbiddenWordsSet( wordsSet, $description.getTitle() )


rule "ProductDescription validation Part 2"
    when
    	$badWordList : BadWordList($wordList : list)
        $listingWord : ListingWord($word : word memberof $wordList, $listing : listing)
    then
        System.out.println($listing.productDescription + " has naughty word:" + $word); 
End





>>> Original Message>>

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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