From 12cdccf3bbd4d3814fdebfd6878322d54d661ded Mon Sep 17 00:00:00 2001
From: Grahame Grieve <grahameg@gmail.ccom>
Date: Fri, 20 Oct 2023 16:25:09 +1100
Subject: [PATCH] Hack for wrong URLs in subscriptions backport

---
 .../loaders/loaderR5/R4BToR5Loader.java       |  2 +-
 .../loaders/loaderR5/R4ToR5Loader.java        |  2 +-
 .../StructureDefinitionHacker.java            | 20 +++++++++++++++++++
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/loaders/loaderR5/R4BToR5Loader.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/loaders/loaderR5/R4BToR5Loader.java
index 6b6744eb9..aa1f203b2 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/loaders/loaderR5/R4BToR5Loader.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/loaders/loaderR5/R4BToR5Loader.java
@@ -123,7 +123,7 @@ public class R4BToR5Loader extends BaseLoaderR5 implements IContextResourceLoade
     if (killPrimitives) {
       throw new FHIRException("Cannot kill primitives when using deferred loading");
     }
-    if (r5 instanceof StructureDefinition && VersionUtilities.isR4BVer(version)) {
+    if (r5 instanceof StructureDefinition) {
       r5 = new StructureDefinitionHacker(version).fixSD((StructureDefinition) r5);
     }
     if (patchUrls) {
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/loaders/loaderR5/R4ToR5Loader.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/loaders/loaderR5/R4ToR5Loader.java
index c8d6e9daf..aed175572 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/loaders/loaderR5/R4ToR5Loader.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/loaders/loaderR5/R4ToR5Loader.java
@@ -123,7 +123,7 @@ public class R4ToR5Loader extends BaseLoaderR5 implements IContextResourceLoader
     if (killPrimitives) {
       throw new FHIRException("Cannot kill primitives when using deferred loading");
     }
-    if (r5 instanceof StructureDefinition && VersionUtilities.isR4Ver(version)) {
+    if (r5 instanceof StructureDefinition) {
       r5 = new StructureDefinitionHacker(version).fixSD((StructureDefinition) r5);
     }
     if (patchUrls) {
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/StructureDefinitionHacker.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/StructureDefinitionHacker.java
index 8e4c92e26..dd36c8394 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/StructureDefinitionHacker.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/conformance/StructureDefinitionHacker.java
@@ -49,9 +49,29 @@ public class StructureDefinitionHacker {
         }
       }
     }    
+    if (sd.getUrl().startsWith("http://hl7.org/fhir/uv/subscriptions-backport")) {
+      for (ElementDefinition ed : sd.getDifferential().getElement()) {
+        fixMarkdownR4BURLs(ed);
+      }
+      for (ElementDefinition ed : sd.getSnapshot().getElement()) {
+        fixMarkdownR4BURLs(ed);
+      }
+    }
     return sd;
   }
 
+  private void fixMarkdownR4BURLs(ElementDefinition ed) {
+    if (ed.hasDefinition()) {
+      ed.setDefinition(ed.getDefinition().replace("http://hl7.org/fhir/R4B/", "http://hl7.org/fhir/R4/"));
+    } 
+    if (ed.hasComment()) {
+      ed.setComment(ed.getComment().replace("http://hl7.org/fhir/R4B/", "http://hl7.org/fhir/R4/"));
+    }
+    if (ed.hasRequirements()) {
+      ed.setRequirements(ed.getRequirements().replace("http://hl7.org/fhir/R4B/", "http://hl7.org/fhir/R4/"));
+    }
+  }
+
   private void fixDocSecURL(ElementDefinition ed) {
     for (TypeRefComponent tr : ed.getType()) {
       for (CanonicalType c : tr.getProfile()) {