make sure snapshots are generated when fetching types

org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/StructureDefinitionHacker.java

@@ -8,7 +8,7 @@ import org.hl7.fhir.r5.model.StructureDefinition;
 import org.hl7.fhir.utilities.VersionUtilities;
 
 /**
- * This doesn't do anythign at this time
+ * This works around known issues in struture definitions
  * 
  * @author graha
  *
@@ -48,7 +48,7 @@ public class StructureDefinitionHacker {
           ed.setComment("e.g. The patient is a pregnant, has congestive heart failure, has an Adenocarcinoma, and is allergic to penicillin.");
         }
       }
-    }
+    }    
     return sd;
   }
 

org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java

@@ -2472,7 +2472,30 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
         return res;
       }
     } 
-    return typeManager.fetchTypeDefinition(typeName);
+    StructureDefinition p = typeManager.fetchTypeDefinition(typeName);
+    if (p != null && !p.isGeneratedSnapshot()) {
+      if (p.isGeneratingSnapshot()) {
+        throw new FHIRException("Attempt to fetch the profile "+p.getVersionedUrl()+" while generating the snapshot for it");
+      }
+      try {
+        if (logger.isDebugLogging()) {
+          System.out.println("Generating snapshot for "+p.getVersionedUrl());
+        }
+        p.setGeneratingSnapshot(true);
+        try {
+          new ContextUtilities(this).generateSnapshot(p);
+        } finally {
+          p.setGeneratingSnapshot(false);      
+        }
+      } catch (Exception e) {
+        // not sure what to do in this case?
+        System.out.println("Unable to generate snapshot @4 for "+p.getVersionedUrl()+": "+e.getMessage());
+        if (logger.isDebugLogging()) {
+          e.printStackTrace();
+        }
+      }
+    }
+    return p;
   }
   
   @Override