Hi Ronald,
I'm not sure I understand the motivation for handling them specially.
Nulls (as opposed to empty fields) are to indicate that corresponding
data should be deleted from the receiving application. This is
supported -- if a field contains "\"\"" then the application should
delete data -- but it isn't HAPI's business to enforce this, so I
don't understand why special treatment is needed.
Can you explain further? E.g. what makes it difficult to check that
something is null, and what validation errors are you getting?
Bryan
On 8/31/07, Life is hard, and then you die <[EMAIL PROTECTED]> wrote:
>
> We're trying to handle hl7 update messages, and these may contain hl7
> null's (""). HAPI does not currently seem to handle them specially,
> which leads to various problems, such as validation failures and
> making it somewhat torturous to detect these nulls.
>
> I've been trying to figure out what the best approach for handling
> nulls would be, and came up with the following: add two methods to
> Type, 'boolean isNull()' and 'void setNull(boolean)'. The parsers
> would set the null-flag appropriately, and the encoders and verifier
> would simiarly check the flag; setting the flag on instances that are
> part of another composite type (as opposed to part of the segment
> directly) would have no effect.
>
> I've done a quick implmentation of this and it works reasonably well.
> But I wanted to gather feedback on the approach before submitting a
> patch. Is there a better alternative? What have others done? Have I
> missed something?
>
> TIA.
>
>
> Cheers,
>
> Ronald
>
>
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