[rules-users] Struggling with Rule syntax - please help...

[Anstis, Michael (M.)]

Hi James,

You can't use a bound object as the list against which "contains"
operates.

Something like this should work, where getLookupValues() returns an
ArrayList by calling LookupTableDOM with name="MILT.CUSTO".

rule "This rule does NOT work" 
when 
	$gateIN : GATE_IN( CUSTOMER_REFERENCE_NUMBER == "HX", $sh_code :
SH_CODE, lookupValues contains $sh_code )
then
	// do something...
End

With kind regards,

Mike

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of jdepaul
Sent: 22 March 2007 13:04
To: rules-users at lists.jboss.org
Subject: Re: [rules-users] Struggling with Rule syntax - please help...


Please help with 'contains' keyword syntax.  I have the following code
in
place - I'm wondering why this rule does NOT parse properly?!

I assert GATE_IN object - that's my primary fact.  I also assert a
supporting fact called a LookupTableDOM into working memory, which
contains
String name and ArrayList values.  I want my rule to fire when
CUSTOMER_REFERENCE_NUMBER == "HX" and GATE_IN.SH_CODE exists in the List
of
values from LookupTableDOM - what am I doing wrong here:

// This does NOT work
1 rule "This rule does NOT work" 
2 	when 
3
4	 // values variable is an ArrayList containing String
elements...
5	    LookupTableDOM( $name : name == "MILT.CUSTO", $MiltVals :
values ); 
6

7		$gateIN : GATE_IN( CUSTOMER_REFERENCE_NUMBER == "HX", 
8		                   $sh_code : SH_CODE, 
9		                   $MiltVals contains $sh_code )  <--
what's wrong with
this line???
10 	                          //$MiltVals.contains($sh_code) )  <--
this did
not work either...
11	then
12		// do something...
13end

This code was built based on the example you offered below - I just
can't
make the syntax work.   Please help.

James



Edson Tirelli-3 wrote:
> 
> rule "retrieving the list"
> when  
>     Customer( $custCode : customer_code )
> then
>     List codes = lookupDAO.getLookup( $custCode );
>     assert( codes );
> end
> 
> rule "doing something"
> when
>     Customer( $custCode : customer_code )
>     $list : List()
>     SHIPMENT_MOVE(customer_code == $custCode, $sc : ship_code,
>                                       $dc : deliver_code, $pc :
port_code,
>                                       ( $list.containts($sc) || 
> $list.containts($dc) || $list.containts($pc) ) )
> then
>     // do something
> end
> 
>    If your DAO returns a specific class, like the one mentioned in one

> of your examples bellow (LookupTableResults) and it is not a
collections 
> implementation, you can even do things like:
> 
>  when
>     SHIPMENT_MOVE(customer_code == "abc", $sc : ship_code,
>                                       $dc : deliver_code, $pc :
port_code
> )
>     LookupTableResult( elements contains $sc | contains $dc | contains

> $pc ) from lookupDAO.getLookup(...)
>     )
> then
>    // consequence
> end
> 
> 

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