[rules-users] Double Handling

[Ade Timi]

Many thanks for the response!

Yes it fires when I use 85.0 instead, but it obviously shouldn't as the
condition is false. My code now looks like this:

 

rule "G2 Equity in Asset"

      ruleflow-group "goods"

      dialect "mvel"

      when

            $d : IndividualDecision(eval($d.getLoanToValue() < 85.0))

      then

            $d.setGoodCount($d.incGoodCount());

            $d.setMessage("0065: G2: Good: Good Equity in Deal");

            //System.out.println((Double.valueOf("85")).doubleValue());

            System.out.println("loanToValue: " + ($d.getLoanToValue()));

end

 

I still get the print output of 92000.0, which is as I expect but I don't
expect the rule to be fired at all. The weird thing is that when I change
the condition to '>' which is the true condition it never fires! I'm at a
loss as to why this is happening.

 

- Ade

 

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: 11 April 2010 09:11
To: Rules Users List
Subject: Re: [rules-users] Double Handling

 

You are comparing a double to a String ("85"). Although MVEL might convert
strings to numbers, I wouldn't use this without some cogent reason.

Do you have this unexpected firing also when you use a double literal, i.e.,
85.0 ?

-W



2010/4/9 Ade Timi <adeyinka.timi at nathean.com>

Hi,

 

I am new to Drools. I am having a problem comparing 2 double values. I have
a Java class with a double attribute called loanToValue. The loanToValue is
been read from an XML file and the value is 92000.0. Based on this value I
do not expect this rule to be fired, but for some reason it does. And the
print statement returns 92000.0. Does anyone know what I'm doing wrong? My
rule looks as follows:

 

rule "G2 Equity in Asset"

      ruleflow-group "goods"

      dialect "mvel"

      when

            $d : IndividualDecision()

            Individual(eval($d.getLoanToValue() < "85"))

      then

            System.out.println("loanToValue: " + ($d.getLoanToValue()));

end

 

Thanks,

Ade

 

Adeyinka Timi | Technical Supprt | Nathean Technologies Ltd

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