Examples of Terser

ca.uhn.hl7v2.util.Terser

Wraps a message to provide access to fields using a terse location specification syntax. For example:

terser.set("MSH-9-3", "ADT_A01");
can be used instead of
message.getMSH().getMessageType().getMessageStructure().setValue("ADT_A01");

The syntax of a location spec is as follows:

location_spec: segment_path_spec "-" field ["(" rep ")"] ["-" component ["-" subcomponent]]

... where rep, field, component, and subcomponent are integers (representing, respectively, the field repetition (starting at 0), and the field number, component number, and subcomponent numbers (starting at 1). Omitting the rep is equivalent to specifying 0; omitting the component or subcomponent is equivalent to specifying 1.

The syntax for the segment_path_spec is as follows:

segment_path_spec: ["/"] (group_spec ["(" rep ")"] "/")* segment_spec ["(" rep ")"]

... where rep has the same meaning as for fields.

A leading "/" indicates that navigation to the location begins at the root of the message; omitting this indicates that navigation begins at the current location of the underlying SegmentFinder (see getFinder() -- this allows manual navigation if desired). The syntax for group_spec is:

group_spec: ["."] group_name_pattern

Here, a . indicates that the group should be searched for (using a SegmentFinder) starting at the current location in the message. The wildcards "*" and "?" represent any number of arbitrary characters, and a single arbitrary character, respectively. For example, "M*" and "?S?" match MSH. The first group with a name that matches the given group_name_pattern will be matched.

The segment_spec is analogous to the group_spec.

As another example, the following subcomponent in an SIU_S12 message:

msg.getSIU_S12_RGSAISNTEAIGNTEAILNTEAIPNTE(1).getSIU_S12_AIGNTE().getAIG().getResourceGroup(1).getIdentifier();

... is referenced by all of the following location_spec:

/SIU_S12_RGSAISNTEAIGNTEAILNTEAIPNTE(1)/SIU_S12_AIGNTE/AIG-5(1)-1 /*AIG*(1)/SIU_S12_AIGNTE/AIG-5(1)-1 /*AIG*(1)/.AIG-5(1)
The search function only iterates through rep 0 of each group. Thus if rep 0 of the first group in this example was desired instead of rep 1, the following syntax would also work (since there is only one AIG segment position in SUI_S12): /.AIG-5(1) @author Bryan Tripp @author Ryan W. Gross (General Electric Corporation - Healthcare IT).




Examples of ca.uhn.hl7v2.util.Terser
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272     
    /**
     * Returns the first Application that has been bound to messages of this type.  
     */
    private ReceivingApplication findApplication(Message theMessage) throws HL7Exception {
        Terser t = new Terser(theMessage);
        AppRoutingData msgData = 
            new AppRoutingDataImpl(t.get("/MSH-9-1"), t.get("/MSH-9-2"), t.get("/MSH-11-1"), t.get("/MSH-12"));
            
        ReceivingApplication app = findDestination(msgData);
        
        //have to send back an application reject if no apps available to process
        if (app == null)
 

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133     /**
     * @see Validator#validate
     */
    public HL7Exception[] validate(Message message, StaticDef profile) throws ProfileException, HL7Exception {
        ArrayList<HL7Exception> exList = new ArrayList<HL7Exception>(20);
        Terser t = new Terser(message);
        
        //check msg type, event type, msg struct ID
        String msgType = t.get("/MSH-9-1");
        if (!msgType.equals(profile.getMsgType())) {
            HL7Exception e =
                new ProfileNotFollowedException("Message type " + msgType + " doesn't match profile type of " + profile.getMsgType());
            exList.add(e);
        }
        
        String evType = t.get("/MSH-9-2");
        if (!evType.equals(profile.getEventType()) && !profile.getEventType().equalsIgnoreCase("ALL")) {
            HL7Exception e =
                new ProfileNotFollowedException("Event type " + evType + " doesn't match profile type of " + profile.getEventType());
            exList.add(e);
        }
        
        String msgStruct = t.get("/MSH-9-3");
        if (msgStruct == null || !msgStruct.equals(profile.getMsgStructID())) {
            HL7Exception e =
                new ProfileNotFollowedException("Message structure " + msgStruct + " doesn't match profile type of " + profile.getMsgStructID());
            exList.add(e);
        }
 

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Examples of ca.uhn.hl7v2.util.Terser
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79     public boolean validate(Message message) throws HL7Exception {
      if (message == null) {
        throw new NullPointerException("Message may not be null");
      }
      
        Terser t = new Terser(message);
        
        MessageRule[] rules = EMPTY_MESSAGE_RULES_ARRAY;
        if (myContext != null) {
          rules = myContext.getMessageRules(message.getVersion(), t.get("MSH-9-1"), t.get("MSH-9-2"));
        }
        
        ValidationException toThrow = null;
        boolean result = true;
        for (int i = 0; i < rules.length; i++) {

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101             LoggerFactory.getLogger(logName).error("message validation failure", problems[i]);
        }
    }
    
    private void addProblemsToACK(Message ack, HL7Exception[] problems) throws HL7Exception {
        Terser t = new Terser(ack);
        
        if (problems.length > 0) {
            t.set("MSA-1", "AE");        
            t.set("MSA-3", "Errors were encountered while testing the message");
        }
        /*
        Segment err = (Segment) ack.get("ERR");
        for (int i = 0; i < problems.length; i++) {
            // problems[i].populate(err); FIXME: broken! needs database
 

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94             out = DefaultApplication.makeACK(header);
        } catch (IOException e) {
            throw new HL7Exception(e);
        }
        
        Terser t = new Terser(out);
        t.set("/MSA-1", theAckCode);


        //TODO: when 2.5 is available, use 2.5 fields for remaining problems 
        if (theErrorCode != HL7Exception.MESSAGE_ACCEPTED) {
            t.set("/MSA-3", theDescription.substring(0, Math.min(80, theDescription.length())));            
            t.set("/ERR-1-4-1", String.valueOf(theErrorCode));
            t.set("/ERR-1-4-3", "HL70357");
        }
        
        String originalEncoding = ourParser.getEncoding(theMessage.getMessage());
        String ackText = ourParser.encode(out, originalEncoding);
        return new TransportableImpl(ackText);

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121       throw new HL7Exception("Can't encode null message",
          HL7Exception.REQUIRED_FIELD_MISSING);
    }


    // register message with response Receiver(s) (by message ID)
    Terser t = new Terser(out);
    String messID = t.get("/MSH-10");


    if (messID == null || messID.length() == 0) {
      throw new HL7Exception(
          "MSH segment missing required field Control ID (MSH-10)",
          HL7Exception.REQUIRED_FIELD_MISSING);

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206             try {
              // get message ID
              String ID = MessageIDGenerator.getInstance()
                  .getNewID();
              Message out = parser.parse(outText);
              Terser tOut = new Terser(out);
              tOut.set("/MSH-10", ID);


              // send, get response
              Message in = initiator.sendAndReceive(out);
              // get ACK ID
              Terser tIn = new Terser(in);
              String ackID = tIn.get("/MSA-2");
              if (ID.equals(ackID)) {
                System.out.println("OK - ack ID matches");
              } else {
                throw new RuntimeException(
                    "Ack ID for message " + ID + " is "

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    // create error message ...
    String errorMessage = null;
    try {
      Message out = DefaultApplication.makeACK(inHeader);
      Terser t = new Terser(out);


      // copy required data from incoming message ...
      try {
        t.set("/MSH-10", MessageIDGenerator.getInstance().getNewID());
      } catch (IOException ioe) {
        throw new HL7Exception("Problem creating error message ID: "
            + ioe.getMessage());
      }


      // populate MSA ...
      t.set("/MSA-1", "AE"); // should this come from HL7Exception
                  // constructor?
      t.set("/MSA-2", Terser.get(inHeader, 10, 0, 1, 1));
      String excepMessage = e.getMessage();
      if (excepMessage != null)
        t.set("/MSA-3",
            excepMessage.substring(0,
                Math.min(80, excepMessage.length())));


      /*
       * Some earlier ACKs don't have ERRs, but I think we'll change this
       * within HAPI so that there is a single ACK for each version (with
       * an ERR).
       */
      // see if it's an HL7Exception (so we can get specific information)
      // ...
      if (e.getClass().equals(HL7Exception.class)) {
//        Segment err = (Segment) out.get("ERR");
        // ((HL7Exception) e).populate(err); // FIXME: this is broken,
        // it relies on the database in a place where it's not available
      } else {
        t.set("/ERR-1-4-1", "207");
        t.set("/ERR-1-4-2", "Application Internal Error");
        t.set("/ERR-1-4-3", "HL70357");
      }


      if (encoding != null) {
        errorMessage = p.encode(out, encoding);
      } else {
 

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172       String version = inbound.getVersion();
      if (version == null)
        version = "2.4"; // TODO: This should be set dynamically based on available HL7 version
      clazz = mcf.getMessageClass("ACK", version, false);
      Message out = clazz.newInstance();
      Terser terser = new Terser(out);


      // populate outbound MSH using data from inbound message ...
      Segment outHeader = (Segment) out.get("MSH");
      fillResponseHeader(inboundHeader, outHeader);


      terser.set("/MSH-9-1", "ACK");
      terser.set("/MSH-9-2", Terser.get(inboundHeader, 9, 0, 2, 1));
      terser.set("/MSH-12", Terser.get(inboundHeader, 12, 0, 1, 1));
      terser.set("/MSA-1", "AA");
      terser.set("/MSA-2", Terser.get(inboundHeader, 10, 0, 1, 1));
      return out;


    } catch (Exception e) {
      throw new HL7Exception("Can't instantiate ACK", e);
    }

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135    * the type and trigger event of the given message, or null if there are
   * none.
   */
  private Application getMatchingApplication(Message message)
      throws HL7Exception {
    Terser t = new Terser(message);
    String messageType = t.get("/MSH-9-1");
    String triggerEvent = t.get("/MSH-9-2");
    return this.getMatchingApplication(messageType, triggerEvent);
  }
 

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