[rules-users] RE: RE: trivial case in xls

[Bin Shen (BA/EDD)]

yr suggestion is working. but u have to augment domain objects :(

finally i tried another workaround:

-------------------------------------------    rule "otherwise"
                        |      CONDITION         when
-------------------------------------------         $p : Person(hashCode != 0)
object type/            |     $p : Person        then    
-------------------------------------------         //
snippet/condition       |     hashCode !=      end
-------------------------------------------
explaination text       |      xxxxxxxxx      
-------------------------------------------
cell/data               |         0
-------------------------------------------
 
it works too, as far as no domain objects have a hashcode of zero :)

hope Mark and Co. can give DTs more expresiveness in the coming releases!


/ Ben


-----Original Message-----
From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Manjax23
Sent: Donnerstag, 16. August 2007 16:45
To: rules-users at lists.jboss.org
Subject: [rules-users] RE: RE: trivial case in xls



you can keep a flag to check if it isNew or isEmpty flag inside the Object and check this flag inside your rule. Or add a method checkNull() to the object and check this method in the rule file.

rule "otherwise"
when 
     $p : Person( isNew == true )
then retract ($p)
end

Hope this works !!! :)


Bin Shen (BA/EDD) wrote:
> 
> 
> but, u haven't answered my question. 
> 
> i see the grouped hidden lines in the example.
> 
> i use yr terms. the condition ("snippet" in my term) can not be empty, 
> and the action ("cell" in my term) can be empty. in my case how should 
> i put the condition, when no field constraint is there? how should i 
> put in the action? an empty makes the condition not applicable!
> 
> the case i raised seems trivial. actually it finds many applications 
> as follows.
> 
> rule "main"
> 	salience 10
> 	when
>  		$p : Person(age > 35)
>  	then
>  		// do something with persons older than 35
> 		System.out.println("hello, " + $p + "!");
> end 	
> 
> rule "otherwise"
> 	when
>  		$p : Person()
>  	then
> 		// ignore other persons, i.e. retract them to avoid memory leaks
>  		retract($p);
> end
> 
> 
> / Ben
> 
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Manjax23
> Sent: Donnerstag, 16. August 2007 15:53
> To: rules-users at lists.jboss.org
> Subject: [rules-users] RE: trivial case in xls
> 
> 
> http://downloads.jboss.com/drools/docs/4.0.0.13773GA/html_single/index
> .html#d0e1805
> 
> Condition and action cell should not be null and should contain valid 
> data.
> If you could see a small plus sign, expand it.you should be able to 
> see the parameters that are passed to the rule, and both the condition 
> and action snippets.
> 
> And the data set you are comparing against can be empty.
> 
> Hope this works for you :)
> 
> Thanks,
> Manjax23
> 
> 
> Bin Shen (BA/EDD) wrote:
>> 
>> hi, Manjax,
>> 
>> have studied the example that u mentioned.
>> 
>> take the schema as follows:
>> object type			$p : Person
>> snippet			? 
>> cell				?
>> 
>> i mean a special case when there is no field constraint at all. if i 
>> leave out the snippet. some runtime error said that the script is 
>> null :((
>> 
>> can u tell me what should i put in snippet and cell respectively. thanx! 
>> 
>> 
>> / Ben
>>  
>> 
>> -----Original Message-----
>> From: rules-users-bounces at lists.jboss.org
>> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Manjax23
>> Sent: Donnerstag, 16. August 2007 14:53
>> To: rules-users at lists.jboss.org
>> Subject: Re: [rules-users] trivial case in xls
>> 
>> 
>> Download the example.zip and there is a sample "ExamplePolicyPricing.xls"
>> and PricingRuleDTExample.java.
>> 
>> :) pls read documentation :)
>> 
>> 
>> Bin Shen (BA/EDD) wrote:
>>> 
>>> Hi, all,
>>> 
>>> use 4.0.0 GA.
>>> 
>>> want to have an xls rule file. i am not sure of how to define the 
>>> following trivial case in xls.
>>> 
>>> can anybody help? thanx! 
>>> 
>>> 	when
>>> 		$p : Person()
>>> 	then
>>> 		// do something with any person
>>> 	end
>>> 
>>> 
>>> / Ben
>>> 
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>> 
>>> 
>> 
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> 
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