One of the most common problems I face with vendors who claim to follow the HL7
standard is their failure to escape the delimiters.
On a recent project I have implemented all the HL7 transforms in hapi, and
everything was looking good until it was noted that a description field could
have un-escaped ^ and & in it.
The client asked me to reconstruct the correct content, which I was hopeful I
could do. Unfortunately, I have hit a snag.
Below is my test case code, and it's output. As you can see, there is some
strangeness about what happens when you parse, terse and encode.
Can anyone shed any light on how I might be able to reconstruct the text
content of the field, despite it's failure to adhere to the standard?
Thanks
Ian
Code:
public void TestZAE() throws HL7Exception {
ModelClassFactory cmf = new
CustomModelClassFactory("au.gov.qld.health.sit.hl7");
QH_ZPACK zPack = new QH_ZPACK(cmf);
String message =
"MSH|^~\\&|HAS|201^201|CIS^prjOrmisIn|00201|20120508000011||ORU^R01|9833|P|^2.4|||||||en\r"
+ "ZAE|20120528130312|Location Group|Arrival Transport Code|Ambulance
Number|Not Used 1|Not Used 2|Not Used 3|Presenting Problem&C1SC1^Second
Component&C2SC1^Third Component&C3SC1^Fourth Component&C4SC1";
zPack.parse(message);
Terser terser = new Terser(zPack);
System.out.println(zPack.printStructure());
System.out.println(zPack.getZAE().getZAE1_DateTimeSeen().getTimeOfAnEvent().getValueAsDate());
ST presentingProblem = zPack.getZAE().getZAE8_PresentingProblem();
System.out.println("Presenting Problem '" +
presentingProblem.getValue() + "'");
System.out.println("Presenting Problem has " +
presentingProblem.getExtraComponents().numComponents() + " extra components.");
String reconstructed = presentingProblem.getValue();
System.out.println("Tersing /ZAE-8-1-2 '" + terser.get("/ZAE-8-1-2") +
"'");
System.out.println("Tersing /ZAE-8-2-2 '" + terser.get("/ZAE-8-2-2") +
"'");
ST testExample = new ST(zPack);
testExample.parse("Presenting Problem&C1SC1^Second
Component&C2SC1^Third Component&C3SC1");
System.out.println(testExample.encode());
for (int i = 2; i <
presentingProblem.getExtraComponents().numComponents() + 2; i++) {
Varies extraData =
presentingProblem.getExtraComponents().getComponent(i - 2);
int ec = extraData.getExtraComponents().numComponents();
System.out.println("Extra component " + i + " has " + ec + " extra
components.");
String extraComponent = terser.get("/ZAE-8-" + i);
int j = 1;
String extraSubcomponent = terser.get("/ZAE-8-" + i + "-" + j);
while (extraSubcomponent != null) {
extraComponent = extraComponent + "&" + extraSubcomponent;
j++;
extraSubcomponent = terser.get("/ZAE-8-" + i + "-" + j);
}
reconstructed = reconstructed + "^" + extraComponent;
}
System.out.println("Presnting Problem '" + reconstructed + "'");
}
Result:
QH_ZPACK (start)
MSH -
MSH|^~\&|HAS|201^201|CIS^prjOrmisIn|00201|20120508000011||ORU^R01|9833|P|^2.4|||||||en
ZAE - ZAE|20120528130312|Location Group|Arrival Transport Code|Ambulance
Number|Not Used 1|Not Used 2|Not Used 3|Presenting Problem^Second
Component&C2SC1^Third Component&C3SC1^Fourth Component&C4SC1
ZAL - Not populated
ZAP - Not populated
ZBD - Not populated
ZCD - Not populated
ZEI - Not populated
ZMR - Not populated
ZMV - Not populated
ZPD - Not populated
ZPX - Not populated
ZRC - Not populated
ZTD - Not populated
ZV1 - Not populated
ZVX - Not populated
ZWL - Not populated
QH_ZPACK (end)
Mon May 28 13:03:12 EST 2012
Presenting Problem 'Presenting Problem'
Presenting Problem has 3 extra components.
Tersing /ZAE-8-1-2 'Second Component'
Tersing /ZAE-8-2-2 'C2SC1'
Presenting Problem\T\C1SC1^Second Component^Third Component
Extra component 2 has 0 extra components.
Extra component 3 has 0 extra components.
Extra component 4 has 0 extra components.
Presenting Problem 'Presenting Problem^Second Component&Second
Component&C2SC1^Third Component&Third Component&C3SC1^Fourth Component&Fourth
Component&C4SC1'
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