From 3e5fadecb0ffc5214836bd7af3d2903e88bc7383 Mon Sep 17 00:00:00 2001
From: Grahame Grieve <grahameg@gmail.com>
Date: Wed, 2 Oct 2019 14:51:43 +1000
Subject: [PATCH] fix issues validating resources with references

---
 .../fhir/r5/validation/ValidationEngine.java  | 27 ++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/ValidationEngine.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/ValidationEngine.java
index 6d9c1d4be..c49bc65bf 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/ValidationEngine.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/ValidationEngine.java
@@ -103,6 +103,7 @@ import org.hl7.fhir.convertors.VersionConvertor_30_50;
 import org.hl7.fhir.convertors.VersionConvertor_40_50;
 import org.hl7.fhir.exceptions.DefinitionException;
 import org.hl7.fhir.exceptions.FHIRException;
+import org.hl7.fhir.exceptions.FHIRFormatError;
 import org.hl7.fhir.r5.conformance.ProfileUtilities;
 import org.hl7.fhir.r5.context.SimpleWorkerContext;
 import org.hl7.fhir.r5.context.SimpleWorkerContext.IContextResourceLoader;
@@ -134,7 +135,9 @@ import org.hl7.fhir.r5.model.StructureMap;
 import org.hl7.fhir.r5.terminologies.ConceptMapEngine;
 import org.hl7.fhir.r5.utils.IResourceValidator.BestPracticeWarningLevel;
 import org.hl7.fhir.r5.utils.IResourceValidator.CheckDisplayOption;
+import org.hl7.fhir.r5.utils.IResourceValidator.IValidatorResourceFetcher;
 import org.hl7.fhir.r5.utils.IResourceValidator.IdStatus;
+import org.hl7.fhir.r5.utils.IResourceValidator.ReferenceValidationPolicy;
 import org.hl7.fhir.r5.utils.FHIRPathEngine;
 import org.hl7.fhir.r5.utils.NarrativeGenerator;
 import org.hl7.fhir.r5.utils.OperationOutcomeUtilities;
@@ -201,7 +204,7 @@ import org.xml.sax.SAXException;
  * @author Grahame Grieve
  *
  */
-public class ValidationEngine {
+public class ValidationEngine implements IValidatorResourceFetcher {
 
   public class ScanOutputItem {
     private String ref;
@@ -1282,6 +1285,7 @@ public class ValidationEngine {
     validator.setAnyExtensionsAllowed(anyExtensionsAllowed);
     validator.setNoInvariantChecks(isNoInvariantChecks());
     validator.setValidationLanguage(language);
+    validator.setFetcher(this);
     return validator;
   }
 
@@ -1557,5 +1561,26 @@ public class ValidationEngine {
     return names;
   }
 
+  @Override
+  public Element fetch(Object appContext, String url) throws FHIRFormatError, DefinitionException, FHIRException, IOException {
+    return null;
+  }
+
+  @Override
+  public ReferenceValidationPolicy validationPolicy(Object appContext, String path, String url) {
+    if (!url.startsWith("http://hl7.org/fhir"))
+      return ReferenceValidationPolicy.IGNORE;
+    throw new Error("Not done yet");
+  }
+
+  @Override
+  public boolean resolveURL(Object appContext, String path, String url) throws IOException, FHIRException {
+    if (!url.startsWith("http://hl7.org/fhir"))
+      return true; // we don't bother with those.
+    if (context.fetchResource(Resource.class, url) != null)
+      return true;
+    throw new Error("Not done yet - resolve "+url);
+  }
+
 }