org.hl7.fhir.r4.model.ValueSet.ValueSetExpansionComponent Java Examples

/**
 * Gets a random code from the expansion of a ValueSet.
 *
 * @param valueSetUri the URI of the ValueSet
 * @param seed a random seed to ensure reproducibility of this result
 * @return the randomly selected Code
 */
public static Code getCode(String valueSetUri, long seed) {
  if (terminologyClient == null) {
    throw new RuntimeException(
        "Unable to generate code from ValueSet URI: terminology service not configured");
  }
  ValueSetExpansionComponent expansion = expandValueSet(valueSetUri);

  Random random = new Random(seed);
  int randomIndex = random.nextInt(expansion.getTotal());

  ValueSetExpansionContainsComponent contains = expansion.getContains().get(randomIndex);
  validateContains(contains);

  return new Code(contains.getSystem(), contains.getCode(), contains.getDisplay());
}
 

private static ValueSetExpansionComponent expandValueSet(String valueSetUri) {
  ValueSet response;
  ValueSetExpansionComponent result = new ValueSetExpansionComponent();
  int total;
  int offset = 0;
  int count = 0;

  do {
    offset += count;
    logger.info("Sending ValueSet expand request to terminology service (" + terminologyClient
        .getServerBase() + "): url=" + valueSetUri + ", count=" + EXPAND_PAGE_SIZE + ", offset="
        + offset);
    try {
      response = responseCache.get(new ExpandInput(valueSetUri, offset));
    } catch (ExecutionException e) {
      throw new RuntimeException("Error expanding ValueSet", e);
    }
    validateExpansion(response.getExpansion());
    total = response.getExpansion().getTotal();
    count = response.getExpansion().getContains().size();
    result.getContains().addAll(response.getExpansion().getContains());
  } while ((offset + count) < total);
  result.setTotal(total);

  return result;
}
 

private void addCodes(ValueSetExpansionComponent expand, List<ValueSetExpansionParameterComponent> params, Parameters expParams, List<ValueSet> filters) throws ETooCostly, FHIRException {
  if (expand != null) {
    if (expand.getContains().size() > maxExpansionSize)
      throw new ETooCostly("Too many codes to display (>" + Integer.toString(expand.getContains().size()) + ")");
    for (ValueSetExpansionParameterComponent p : expand.getParameter()) {
      if (!existsInParams(params, p.getName(), p.getValue()))
        params.add(p);
    }

    copyImportContains(expand.getContains(), null, expParams, filters);
  }
}
 

private void addConcepts(ConceptSetComponent theInclude, ValueSetExpansionComponent theRetVal, Set<String> theWantCodes, List<ConceptDefinitionComponent> theConcepts) {
    for (ConceptDefinitionComponent next : theConcepts) {
        if (theWantCodes.isEmpty() || theWantCodes.contains(next.getCode())) {
            theRetVal
                    .addContains()
                    .setSystem(theInclude.getSystem())
                    .setCode(next.getCode())
                    .setDisplay(next.getDisplay());
        }
        addConcepts(theInclude, theRetVal, theWantCodes, next.getConcept());
    }
}
 

private static void validateExpansion(@Nonnull ValueSetExpansionComponent expansion) {
  if (expansion.getContains().isEmpty()) {
    throw new RuntimeException("ValueSet expansion does not contain any codes");
  } else if (expansion.getTotalElement().isEmpty()) {
    throw new RuntimeException("No total element in ValueSet expand result");
  }
}
 

private void excludeCodes(ValueSetExpansionComponent expand, List<ValueSetExpansionParameterComponent> params) {
  for (ValueSetExpansionContainsComponent c : expand.getContains()) {
    excludeCode(c.getSystem(), c.getCode());
  }
}
 

/**
 * Expand the value set fragment (system | codes | filters). Note that this 
 * might fail if the expansion is very large. If the expansion fails, then the 
 * checkVS will be called instead
 */
public ValueSetExpansionComponent expandVS(ConceptSetComponent inc) throws Exception;