HL7/MLLP results and acknowledgement

var raw = String(connectorMessage.getRawData())
    .replace(/\r\n/g, '\r')
    .replace(/\n/g, '\r');

var segments = raw.split('\r').filter(function (segment) {
    return segment.length > 0;
});

var msh = segments.filter(function (segment) {
    return segment.indexOf('MSH|') === 0;
})[0];

var pid = segments.filter(function (segment) {
    return segment.indexOf('PID|') === 0;
})[0];

var obxSegments = segments.filter(function (segment) {
    return segment.indexOf('OBX|') === 0;
});

if (!msh) {
    throw 'HL7 message does not contain an MSH segment.';
}

if (!pid || obxSegments.length === 0) {
    throw 'HL7 message must contain PID and at least one OBX segment.';
}

var messageId = msh.split('|')[9];
var specimenNumber = pid.split('|')[3];

channelMap.put('hl7_message_id', messageId);

var results = obxSegments.map(function (segment) {
    var field = segment.split('|');
    var testParts = field[3].split('^');

    return {
        analyzer_test_code: testParts[0],
        value: field[5],
        unit: field[6],
        flag: field[8] || null,
        observed_at: new Date().toISOString()
    };
});

msg = JSON.stringify({
    message_id: messageId,
    instrument_code: 'PILOT-HEM-01',
    specimen_number: specimenNumber,
    received_at: new Date().toISOString(),
    results: results
});

var controlId = String(channelMap.get('hl7_message_id') || '');
var timestamp = new java.text.SimpleDateFormat('yyyyMMddHHmmss')
    .format(new java.util.Date());

var ack = 'MSH|^~\\&|OIE|HMIS|MOCK-ANALYZER|LAB|'
    + timestamp
    + '||ACK|'
    + java.util.UUID.randomUUID().toString()
    + '|P|2.5\r'
    + 'MSA|AA|'
    + controlId
    + '\r';

msg = ack;
responseMap.put('d1', ack);

MSA|AA|{{ORIGINAL_MESSAGE_ID}}