Re: [HAPI-devel] Parse MSH from arbitrary message

[David B. <Dav...@he...>]

Hi Andrew,

Is your concern about casting related to performance? Because, in general, solutions should be provisioned for the work they have to do. If you need more processing grunt, its often better to tackle that before 'optimising' your code.

Aside from casting the whole message, you can cast the segment [eg (pseudo-code) MSH msh = (MSH) Terser.getSegment("MSH")] to get a proper MSH object. But this option is still casting.

Another option is treating the message as a String eg...
    protected static String getMsh10(String input) {
        int startOfMsh10 = StringUtils.ordinalIndexOf(input, "|", 10);
        int lengthOfMsh10 = StringUtils.ordinalIndexOf(input, "|", 11) - startOfMsh10;
        return StringUtils.mid(
            input
            , startOfMsh10
            , lengthOfMsh10
        );
    }

But that option brings me back to the first point - 'optimising' by String manipulation is convoluted. It'd have been better to wear the costs of parsing and casting the message and enjoy the benefits of using HAPI.

Hope this helps,
David

----------------------------------------------------------------------

Message: 1
Date: Thu, 23 Jan 2020 18:13:11 -0800
From: Andrew Ring <and...@ni...>
To: hl7...@li...
Subject: [HAPI-devel] Parse MSH from arbitrary message
Message-ID:
<CAE...@ma...>
Content-Type: text/plain; charset="utf-8"

I'm receiving HL7 messages of any type, and want to examine the MSH segment before having to cast the message to a particular type. I can't seem to find a mechanism to do this. I can get individual MSH fields using a Terser, but I would prefer to use well typed structures. Even getting the MSH segment using Terser.getSegment() does not appear to be able to be converted into an MSH object. Can anyone help?

Thanks,
Andrew Ring
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