Source Code of$TerserExpression

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The Original Code is "".  Description:
"Validation rule for checking values extracted by a Terser"

The Initial Developer of the Original Code is University Health Network. Copyright (C)
2012.  All Rights Reserved.

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import java.util.StringTokenizer;

import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.Location;
import ca.uhn.hl7v2.model.Message;
import ca.uhn.hl7v2.model.Segment;
import ca.uhn.hl7v2.util.Terser;
import ca.uhn.hl7v2.validation.builder.Expression;
import ca.uhn.hl7v2.validation.builder.Predicate;
import ca.uhn.hl7v2.validation.builder.PredicateMessageRule;

* Validation rule for checking values extracted by a {@link Terser}.
* @author Christian Ohr
public class TerserMessageRule extends PredicateMessageRule {

     * Creates a new instance of a terser message rule
     * @param terserExpression terser string like "PID-3-1"
     * @param predicate predicate used for the test
  public TerserMessageRule(String terserExpression, Predicate predicate) {
    super(predicate, new TerserExpression(terserExpression));

  private static class TerserExpression implements Expression<Message> {

    private String expression;

    public TerserExpression(String expression) {
      this.expression = expression;

    public Object evaluate(Message msg) throws HL7Exception {
      return new Terser(msg).get(expression);

    public String getDescription() {
      // Terser Expression is equivalent with Location
      return "";

    public Location getLocation(Message msg) throws HL7Exception {
      Terser t = new Terser(msg);
      StringTokenizer tok = new StringTokenizer(expression, "-", false);
      Segment segment = t.getSegment(tok.nextToken());
      Location location = new Location();
      return location;


Related Classes of$TerserExpression

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