package example;
import java.io.File;
import java.io.FileReader;
import java.util.List;
import javax.servlet.ServletException;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.filefilter.WildcardFileFilter;
import org.hl7.fhir.dstu3.hapi.validation.DefaultProfileValidationSupport;
import org.hl7.fhir.dstu3.hapi.validation.FhirInstanceValidator;
import org.hl7.fhir.dstu3.hapi.validation.IValidationSupport;
import org.hl7.fhir.dstu3.hapi.validation.ValidationSupportChain;
import org.hl7.fhir.dstu3.model.CodeSystem;
import org.hl7.fhir.dstu3.model.ContactPoint.ContactPointSystem;
import org.hl7.fhir.dstu3.model.Observation;
import org.hl7.fhir.dstu3.model.OperationOutcome;
import org.hl7.fhir.dstu3.model.Patient;
import org.hl7.fhir.dstu3.model.StringType;
import org.hl7.fhir.dstu3.model.StructureDefinition;
import org.hl7.fhir.instance.model.ValueSet;
import org.hl7.fhir.instance.model.ValueSet.ConceptSetComponent;
import org.hl7.fhir.instance.model.ValueSet.ValueSetExpansionComponent;
import org.hl7.fhir.instance.model.api.IBaseResource;
import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.parser.IParser;
import ca.uhn.fhir.parser.StrictErrorHandler;
import ca.uhn.fhir.rest.client.IGenericClient;
import ca.uhn.fhir.rest.server.RestfulServer;
import ca.uhn.fhir.validation.FhirValidator;
import ca.uhn.fhir.validation.IValidatorModule;
import ca.uhn.fhir.validation.SchemaBaseValidator;
import ca.uhn.fhir.validation.SingleValidationMessage;
import ca.uhn.fhir.validation.ValidationResult;
import ca.uhn.fhir.validation.schematron.SchematronBaseValidator;
@SuppressWarnings("serial")
public class ValidatorExamples {
public void validationIntro() {
// START SNIPPET: validationIntro
FhirContext ctx = FhirContext.forDstu3();
// Ask the context for a validator
FhirValidator validator = ctx.newValidator();
// Create some modules and register them
IValidatorModule module1 = new SchemaBaseValidator(ctx);
validator.registerValidatorModule(module1);
IValidatorModule module2 = new SchematronBaseValidator(ctx);
validator.registerValidatorModule(module2);
// Pass a resource in to be validated. The resource can
// be an IBaseResource instance, or can be a raw String
// containing a serialized resource as text.
Patient resource = new Patient();
ValidationResult result = validator.validateWithResult(resource);
String resourceText = "<Patient.....>";
ValidationResult result2 = validator.validateWithResult(resourceText);
// The result object now contains the validation results
for (SingleValidationMessage next : result.getMessages()) {
System.out.println(next.getLocationString() + " " + next.getMessage());
}
// END SNIPPET: validationIntro
}
// START SNIPPET: serverValidation
public class MyRestfulServer extends RestfulServer {
@Override
protected void initialize() throws ServletException {
// ...Configure resource providers, etc...
// Create a context, set the error handler and instruct
// the server to use it
FhirContext ctx = FhirContext.forDstu3();
ctx.setParserErrorHandler(new StrictErrorHandler());
setFhirContext(ctx);
}
}
// END SNIPPET: serverValidation
@SuppressWarnings("unused")
public void enableValidation() {
// START SNIPPET: clientValidation
FhirContext ctx = FhirContext.forDstu3();
ctx.setParserErrorHandler(new StrictErrorHandler());
// This client will have strict parser validation enabled
IGenericClient client = ctx.newRestfulGenericClient("http://fhirtest.uhn.ca/baseDstu3");
// END SNIPPET: clientValidation
}
public void parserValidation() {
// START SNIPPET: parserValidation
FhirContext ctx = FhirContext.forDstu3();
// Create a parser and configure it to use the strict error handler
IParser parser = ctx.newXmlParser();
parser.setParserErrorHandler(new StrictErrorHandler());
// This example resource is invalid, as Patient.active can not repeat
String input = "<Patient><active value=\"true\"/><active value=\"false\"/></Patient>";
// The following will throw a DataFormatException because of the StrictErrorHandler
parser.parseResource(Patient.class, input);
// END SNIPPET: parserValidation
}
public void validateResource() {
// START SNIPPET: basicValidation
// As always, you need a context
FhirContext ctx = FhirContext.forDstu3();
// Create and populate a new patient object
Patient p = new Patient();
p.addName().setFamily("Smith").addGiven("John").addGiven("Q");
p.addIdentifier().setSystem("urn:foo:identifiers").setValue("12345");
p.addTelecom().setSystem(ContactPointSystem.PHONE).setValue("416 123-4567");
// Request a validator and apply it
FhirValidator val = ctx.newValidator();
// Create the Schema/Schematron modules and register them. Note that
// you might want to consider keeping these modules around as long-term
// objects: they parse and then store schemas, which can be an expensive
// operation.
IValidatorModule module1 = new SchemaBaseValidator(ctx);
IValidatorModule module2 = new SchematronBaseValidator(ctx);
val.registerValidatorModule(module1);
val.registerValidatorModule(module2);
ValidationResult result = val.validateWithResult(p);
if (result.isSuccessful()) {
System.out.println("Validation passed");
} else {
// We failed validation!
System.out.println("Validation failed");
}
// The result contains a list of "messages"
List<SingleValidationMessage> messages = result.getMessages();
for (SingleValidationMessage next : messages) {
System.out.println("Message:");
System.out.println(" * Location: " + next.getLocationString());
System.out.println(" * Severity: " + next.getSeverity());
System.out.println(" * Message : " + next.getMessage());
}
// You can also convert the results into an OperationOutcome resource
OperationOutcome oo = (OperationOutcome) result.toOperationOutcome();
String results = ctx.newXmlParser().setPrettyPrint(true).encodeResourceToString(oo);
System.out.println(results);
// END SNIPPET: basicValidation
}
public static void main(String[] args) throws Exception {
instanceValidator();
}
private static void instanceValidator() throws Exception {
// START SNIPPET: instanceValidator
FhirContext ctx = FhirContext.forDstu3();
// Create a FhirInstanceValidator and register it to a validator
FhirValidator validator = ctx.newValidator();
FhirInstanceValidator instanceValidator = new FhirInstanceValidator();
validator.registerValidatorModule(instanceValidator);
/*
* If you want, you can configure settings on the validator to adjust
* its behaviour during validation
*/
instanceValidator.setAnyExtensionsAllowed(true);
/*
* Let's create a resource to validate. This Observation has some fields
* populated, but it is missing Observation.status, which is mandatory.
*/
Observation obs = new Observation();
obs.getCode().addCoding().setSystem("http://loinc.org").setCode("12345-6");
obs.setValue(new StringType("This is a value"));
// Validate
ValidationResult result = validator.validateWithResult(obs);
// Do we have any errors or fatal errors?
System.out.println(result.isSuccessful()); // false
// Show the issues
for (SingleValidationMessage next : result.getMessages()) {
System.out.println(" Next issue " + next.getSeverity() + " - " + next.getLocationString() + " - " + next.getMessage());
}
// Prints:
// Next issue ERROR - /f:Observation - Element '/f:Observation.status': minimum required = 1, but only found 0
// Next issue WARNING - /f:Observation/f:code - Unable to validate code "12345-6" in code system "http://loinc.org"
// You can also convert the result into an operation outcome if you
// need to return one from a server
OperationOutcome oo = (OperationOutcome) result.toOperationOutcome();
// END SNIPPET: instanceValidator
}
private static void instanceValidatorCustom() throws Exception {
// START SNIPPET: instanceValidatorCustom
FhirContext ctx = FhirContext.forDstu3();
// Create a FhirInstanceValidator and register it to a validator
FhirValidator validator = ctx.newValidator();
FhirInstanceValidator instanceValidator = new FhirInstanceValidator();
validator.registerValidatorModule(instanceValidator);
IValidationSupport valSupport = new IValidationSupport() {
@Override
public org.hl7.fhir.dstu3.model.ValueSet.ValueSetExpansionComponent expandValueSet(FhirContext theContext, org.hl7.fhir.dstu3.model.ValueSet.ConceptSetComponent theInclude) {
// TODO: implement
return null;
}
@Override
public List<StructureDefinition> fetchAllStructureDefinitions(FhirContext theContext) {
// TODO: implement
return null;
}
@Override
public CodeSystem fetchCodeSystem(FhirContext theContext, String theSystem) {
// TODO: implement
return null;
}
@Override
public <T extends IBaseResource> T fetchResource(FhirContext theContext, Class<T> theClass, String theUri) {
// TODO: implement
return null;
}
@Override
public StructureDefinition fetchStructureDefinition(FhirContext theCtx, String theUrl) {
// TODO: implement
return null;
}
@Override
public boolean isCodeSystemSupported(FhirContext theContext, String theSystem) {
// TODO: implement
return false;
}
@Override
public CodeValidationResult validateCode(FhirContext theContext, String theCodeSystem, String theCode, String theDisplay) {
// TODO: implement
return null;
}
};
/*
* ValidationSupportChain strings multiple instances of IValidationSupport together. The
* code below is useful because it means that when the validator wants to load a
* StructureDefinition or a ValueSet, it will first use DefaultProfileValidationSupport,
* which loads the default HL7 versions. Any StructureDefinitions which are not found in
* the built-in set are delegated to your custom implementation.
*/
ValidationSupportChain support = new ValidationSupportChain(new DefaultProfileValidationSupport(), valSupport);
instanceValidator.setValidationSupport(support);
// END SNIPPET: instanceValidatorCustom
}
@SuppressWarnings("unused")
private static void validateFiles() throws Exception {
// START SNIPPET: validateFiles
FhirContext ctx = FhirContext.forDstu3();
// Create a validator and configure it
FhirValidator validator = ctx.newValidator();
validator.setValidateAgainstStandardSchema(true);
validator.setValidateAgainstStandardSchematron(true);
// Get a list of files in a given directory
String[] fileList = new File("/home/some/dir").list(new WildcardFileFilter("*.txt"));
for (String nextFile : fileList) {
// For each file, load the contents into a string
String nextFileContents = IOUtils.toString(new FileReader(nextFile));
// Parse that string (this example assumes JSON encoding)
IBaseResource resource = ctx.newJsonParser().parseResource(nextFileContents);
// Apply the validation. This will throw an exception on the first
// validation failure
ValidationResult result = validator.validateWithResult(resource);
if (result.isSuccessful() == false) {
throw new Exception("We failed!");
}
}
// END SNIPPET: validateFiles
}
}