[rules-users] using BigDecimal in rules

[Edson Tirelli]

   Can you open a JIRA plz? This way we don't lose this in the emails.

   Thanks,
    Edson

2009/3/16 Libor Nenadál <libor.nenadal at gmail.com>

>
> The problem with BigDecimal is this:
> (new BigDecimal("43.0")).equals(new BigDecimal("43")) is evaluated to false
> but
> (new BigDecimal("43.0")).compareTo(new BigDecimal("43")) is evaluated to 0
> => they are equal
>
> Note that you should use String in constructor instead of double otherwise
> you get something unpredictable - see
>
> http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigDecimal.html#BigDecimal(double)<http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigDecimal.html#BigDecimal%28double%29>
>
> And because your evaluator uses equals, it is quite unusable. Is it
> possible
> to do some special wrapper for this type? Just for equality, other
> operations would be nice to look like "x * y" but with division you need to
> specify scale and therefore I think it is not possible to wrap it to some
> nice look. :-(
>
> Regards,
> Libor
>
>
> Edson Tirelli-3 wrote:
> >
> >    It sounds like a bug. Can you get Drools source code and look at the
> > unit
> > test for this to make sure your scenario works there? The file is:
> >
> > drools-core/src/test/java/org/drools/base/EvaluatorFactoryTest.java
> >
> >    Method is:
> >
> > testBigDecimal()
> >
> >    Very easy to add your use case in there.
> >
> >    Let us know what you find.
> >
> >    Edson
> >
> >
>
> --
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>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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