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From "Antonio Gallardo" <agalla...@agsoftware.dnsalias.com>
Subject Re: [WOODY] - New short, double and float datatypes
Date Sun, 02 Nov 2003 11:08:18 GMT
Sylvain Wallez dijo:
> Antonio Gallardo wrote:
>
>>Hi:
>>
>>We tought that in some cases we need this datatypes. Currently, they
>> are not implemented in Woody.
>>
>>Can we do that?
>>
>>
>
> I guess you need this for binding forms to application data?

Yep.

>
> So yes we can, but... I've been wondering for some time how to make
> Woody datatypes more tolerant regarding the target binding datatype.
> Defining all these new classes and the associated converters first makes
>  the configuration bigger and second requires the form writer to know
> the  exact range of the numbers it bind to.
>
> If woody datatypes were more tolerant, we could simply have a "long" and
>  "double" datatypes for numbers, and have them able to accept int, byte,
>  short and float values. These can be considered as secondary value
> types  whose values are accepted by a datatype along with its native
> value type.
>
> Similiarily, we can say that the "date" datatype can accept a secondary
> "long" value type which will avoid defining a "longdate" datatype in the
>  near future...
>
> For this, I was envisioning two new methods on Datatype:
> - Object normalizeValue(Object): accepts various secondary value types
> as parameter and normalize them to the real type. E.g. an Integer will
> be converted into a Long.
> - Object getValueAs(Object value, Class clazz): converts a value to one
> of the possible secondary value classes allowed for this datatype.
>
> Note that this doesn't collide with Convertors since these methods act
> on Object values and not on Strings.
>
> What do you think?

Good idea. I thought about that because the abstract class:
java.lang.Number  is the parent of BigDecimal, BigInteger, Byte, Double,
Float, Integer, Long, Short.

Best Regards,

Antonio Gallardo




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