[rules-users] Problem calling a function returning String

[rainbowflower]

Hallo Edson, 

The equals() usage had solved my problem. Thanks for your quick reply, :-)
It was so simple but didnt occur to me. 

Barton, my sequence had been 

ValidationUtilities.evaVersionsNr = "1234";
<make session>
fireAllRules()

only. However, i agree with the risk in using
ValidationUtilities.evaVersionsNr which is a public static member. I shall
look into changing my approach. Thanks for your help too. 

Have a nice day.



Edson Tirelli-3 wrote:
> 
>    Remember that inside the eval() block, since you are using java
> dialect,
> what you have is java code. So, == is checking for String identity, that
> is
> not what you want.
> 
>    You need to call the equals() method:
> 
> eval( functionThatReturnsString().equals("1234) )
> 
>     []s
>     Edson
> 
> 2009/7/7 rainbowflower <al_aysha at yahoo.co.in>
> 
>>
>> Hi all,
>>
>> I am rather new to Drools and I have a problem using functions.
>>
>> I have a rule like:
>>
>> rule "rule 1"
>>    when
>>           eval(getEVAVersionsNr() == "1234")
>>        then
>>           System.out.println("rule fired");
>> end
>>
>> The getEVAVersionsNr() method is present in a Java class
>> "ValidationUtilities.java", which I'm importing in my drl file and it
>> looks
>> like this:
>>
>> public class ValidationUtilities {
>>
>>  public static String evaVersionsNr;
>>
>> public static String getZEVAVersionsNummer() {
>>    return evaVersionsNr;
>>  }
>> }
>>
>> This static attribute "evaVersionsNr" is set to "1234" from another Java
>> class before I fire my rules. So, I assume that the eval construct should
>> return true. But, it does not return true and the consequence is not
>> exected.
>>
>> Further info:
>>
>> When I modify my rule like:
>>
>> rule "rule 1"
>>    when
>>           eval(true)
>>        then
>>           System.out.println(getEVAVersionsNr());
>> end
>>
>> the consequence part is getting executed and 1234 is getting printed.
>>
>> I am really lost and I could not find out what goes wrong. If someone
>> could
>> find out what I am missing, I shall be thankful.
>>
>> Thanks in advance.
>> --
>> View this message in context:
>> http://www.nabble.com/Problem-calling-a-function-returning-String-tp24375624p24375624.html
>> Sent from the drools - user mailing list archive at Nabble.com.
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
> 
> 
> 
> -- 
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss by Red Hat @ www.jboss.com
> 
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
> 
> 

-- 
View this message in context: http://www.nabble.com/Problem-calling-a-function-returning-String-tp24375624p24388155.html
Sent from the drools - user mailing list archive at Nabble.com.