[rules-users] compare string and int in LHS

[brenner]

Hi,
the class "TripleObject" has a method "getValue". This method convert the
String value to an Ingeger. 


rule "a Rule"
   when
         $vb_refmax : TripleObject( name == "vb_refmax" );
         $vb_reflow : TripleObject( name == "vb_reflow");
         eval( $vb_reflow.getValue(TripleObject.VALUE_TYP_INTEGER) >=
$vb_refmax.getValue(TripleObject.VALUE_TYP_INTEGER) );
    then 
end


I hope this helps.




blackone wrote:
> 
> 
> Hi! Could you provide the rule showing how you have used eval to solve the
> problem? I'm new to drools and have the same problem...
> 
> 
> 
> brenner wrote:
>> 
>> Thanks for your answer.
>> 
>> Yes, with eval it works. I had oversight it.
>> 
>> The question with the model I have aked myself. But I can't change it.
>> There are to much factors involved. Storable by Hibernate. Based on
>> configuration files with key-value, whereas the value could have various
>> data types (c-types) and all without a rule. Very bad, I know. 
>> 
>> 
>> 
>> 
>> 
>> Anstis, Michael (M.) wrote:
>>> 
>>> You could use an inline eval too.
>>> 
>>> The problem possibly lies more with your model; why not have one
>>> subclass
>>> expose the String property and another the Integer property and code the
>>> rules using the subclasses? Much safer throughout the entire application
>>> than having to worry whether some field is meant to be a string or
>>> number
>>> (It's very easy to question problems though - there could be very good
>>> reason why you need the model "as is").
>>> 
>>> -----Original Message-----
>>> From: rules-users-bounces at lists.jboss.org
>>> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of brenner
>>> Sent: 08 February 2008 12:33
>>> To: rules-users at lists.jboss.org
>>> Subject: Re: [rules-users] compare string and int in LHS
>>> 
>>> 
>>> Hi,
>>> 
>>> I have found a solution, but I don't know that it is the best:
>>> My solution:
>>> 
>>> I have extend my Class with a method which returns the string as a
>>> integer.
>>> And my rule is like this:
>>> 
>>> i : Integer( intValue <= 1) from $test.getValue(Test.VALUE_TYP_INTEGER);
>>> 
>>> Is that the only/best solution. 
>>> Can't I convert Strings to Integer on the LHS of a rule?
>>> 
>>> greeting
>>> Daniel
>>> 
>>> 
>>> 
>>> 
>>> brenner wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> I have a class, wich contains a string value. This value is in some use
>>>> cases an integer. 
>>>> For this use case I want to convert (parse) the string typ to an
>>>> integer
>>>> because I want that the following rule matches: 
>>>> 
>>>> rule
>>>>   when
>>>>     t : Test(value <= 1)
>>>>   then
>>>>     System.out.println(t)
>>>> end
>>>> 
>>>> 
>>>> class Test {
>>>>    
>>>>    String value;
>>>> 
>>>>    getValue();
>>>>    setValue();
>>>> 
>>>> }
>>>> 
>>>> Have anyone a solution or some help for me?
>>>> Is that possible what I want to do?
>>>> 
>>>> Thanks
>>>> Daniel
>>>> 
>>> 
>>> -- 
>>> View this message in context:
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>>> Sent from the drools - user mailing list archive at Nabble.com.
>>> 
>>> _______________________________________________
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>>> 
>> 
>> 
> 
> 

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