Re: [HAPI-devel] Checking for the existence of a segment or group

[James A. <ja...@ja...>]

Oops, looks like Christian beat me to it. :)

James


On Wed, Jul 3, 2013 at 7:41 AM, James Agnew <ja...@ja...> wrote:

> Hi Ian,
>
> The cleaner alternative, which was just added in HAPI 2.1 oddly enough is
> as follows:
>
>   if (!hl7Message.getINSURANCE(0).getIN1().isEmpty()) {
>     .. blah ..
>   }
>
> There is also the somewhat uglier alternative which would work in older
> releases:
>
>   if (!hl7Message.getINSURANCE(0).getAll("IN1").length == 0) {
>     .. blah ..
>   }
>
> It's worth noting that these two techniques are not 100% semantically
> equivalent. In the case of a message containing an empty IN1 segment (in
> other words, you parsed a message that contained an IN1 segment, but that
> segment had no field values), the second "blah" would get triggered but the
> first one wouldn't.
>
> Cheers,
> James
>
>
> On Tue, Jul 2, 2013 at 7:51 PM, Ian Vowles <Ian...@he...>wrote:
>
>>  When building a transform of an HL7 message where some segment is
>> optional, but if it is present lots of fields are to be checked and
>> transformed, I like to check for existence of the segment first.
>>
>> Using HAPI I code the check like this:
>>
>>          if
>> (!("IN1".equals(hl7Message.getINSURANCE(0).getIN1().encode()))) {
>>             hl7In1 = hl7Message.getINSURANCE(0).getIN1();
>>             .
>>             .
>>             Do the get/set/change of various fields of the hl7In1
>>             .
>>             .
>>         }
>>
>> Is this a good way to check if it's there?  It has never looked quite
>> right to me, but I haven't figured out another way.
>>
>> Thanks
>> Ian
>>
>>
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