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From Marshall Schor <...@schor.com>
Subject Re: BigDecimal as CAS type
Date Wed, 10 Nov 2010 18:43:16 GMT

On 11/10/2010 10:00 AM, Thilo Götz wrote:
> On 11/10/2010 15:40, Frank Schilder wrote:
>> Hi all,
>> I'm trying to represent the value of a money amount as BigDecimal. For
>> example $3.25 should be annotated with a Money annotation. The Money
>> annotation should have a feature called val and the value of this feature
>> should be of type BigDecimal instead of float (or double).
>> It has been suggested elsewhere that using floating point numbers is not a
>> good idea for representing money amounts:
>> http://www.ibm.com/developerworks/java/library/j-jtp0114/
>> Unfortunately, BigDecimals are not supported as CAS type for the value of an
>> annotation feature. Would it be possible to add this type easily or could
>> you suggest a work-around?
> It is not easy to add this type.
> The easiest work-around would be to put a string representation
> in the CAS.  Just use the BigDecimal.toString() method to encode,
> and the BigDecimal(String) constructor to decode.  I know it's
> ugly.  If you hide this conversion behind some accessor methods
> for your money annotation, you can later change this implementation
> for something better.

If you use the JCas approach, you can put the "hiding" conversions into some
customized methods in the JCas cover type.

> A more efficient representation would be to build your own CAS
> datatype with an int for the scale and a byte array for the
> value.  However, that seems like a lot of work for little benefit.
> But then I don't know what your application is.
> HTH,
> Thilo
>> Thanks a lot,
>> Frank

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