I have been trying to create a method that checks a field for a specific value
that will work when passed just a Message object with any parsed message. It's
a bit tricky because it's in a Z-Segment, but the methods all look to be there.
Unfortunately, I have hit a somewhat odd behaviour. My input message is an A01
with a couple of ZAL segments on the end. Here is the code:
String inputMessage
=
"MSH|^~\\&|HOMER|irusgch|EGATE-IRUS^prjHbcisRawIn|00050|20150324121258||ADT^A01|20150324121258383268|P|2.3|||AL|AL|AUS|ASCII|ENG\r"
.
. bunch of nice A01 segments
.
+ "ZMR|20140930|095522|1|GC1|\"\"|0001|NIUMM\r"
+ "ZAL|1|AL|NOTTRAU1^NOT TRAUMA
SERVICES^ALERT|||20150324000000||A01 TEST\r"
+ "ZAL|2|AL|NOTTRAU^TRAUMA SERVICES^ALERT|||20150324000000||A01
TEST\r";
HapiContext context = new DefaultHapiContext();
context.setModelClassFactory(new GenericModelClassFactory());
Message message = context.getPipeParser().parse(inputMessage);
Terser terser = new Terser(message);
SegmentFinder finder = terser.getFinder();
Segment zal;
// zal = finder.getSegment("ZAL", 2);
// zal = finder.getSegment("ZAL", 3);
boolean zalFound = true;
boolean validZal = false;
int zalIndex = 0;
while (zalFound && !validZal) {
try {
zal = finder.getSegment("ZAL", zalIndex);
String zal3 = terser.get(zal, 3, 0, 1, 1);
validZal = "TRAU".equalsIgnoreCase(zal3);
System.out.println("Counter is = '" + zalIndex + "' ZAL-3-1 =
'" + zal3 + "'");
zalIndex++;
zalFound = zalIndex < 100;
} catch (HL7Exception ex) {
zalFound = false;
}
}
System.out.println("Valid ZAL found = " + zalFound);
When I first started writing, I tried out the line zal =
finder.getSegment("ZAL", 3); to see if an exception would be thrown, and it
was, and it even gave me a range for the number of ZAL segments (more on that
later).
However, when I ran the code in the loop, before I added an upper bound to the
count of ZAL segments, it would loop for ever.
Further investigation showed me that if I asked the finder for a segment
repetition 1 higher than the number present (uncommenting the two getSegment
lines together does not throw an exception), then an empty segment is added and
returned, and since I am incrementing through, this behaviour continues forever.
So, how can I find out before I start looping, how many repeats of the segment
exist, so I can set an accurate upper bound, or how can I get a 'not found'
exception to be thrown should I ask for an index beyond those that actually
exist?
I did find that using zalFound = !zal.isEmpty(); instead of using a large upper
bound of the count worked, which is ok, but not really obvious.
Thanks
Ian
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