From 00f3dfc4b943d312d6e52aa8d7ac1a91bfb5feb1 Mon Sep 17 00:00:00 2001
From: Grahame Grieve <grahameg@gmail.com>
Date: Fri, 3 Dec 2021 15:25:54 +1100
Subject: [PATCH] set up release

---
 RELEASE_NOTES.md                              |  1 +
 .../hl7/fhir/r5/utils/ToolingExtensions.java  | 23 +++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index e69de29bb..43f4d6510 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -0,0 +1 @@
+* Add usesExtension to ToolingExtensions
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
index a107dfc26..2c40dff4d 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
@@ -69,7 +69,9 @@ import java.util.Map;
 import org.apache.commons.lang3.StringUtils;
 import org.fhir.ucum.Utilities;
 import org.hl7.fhir.exceptions.FHIRException;
+import org.hl7.fhir.r5.model.Base;
 import org.hl7.fhir.r5.model.BooleanType;
+import org.hl7.fhir.r5.model.CanonicalResource;
 import org.hl7.fhir.r5.model.CanonicalType;
 import org.hl7.fhir.r5.model.CodeSystem.ConceptDefinitionComponent;
 import org.hl7.fhir.r5.model.CodeType;
@@ -89,6 +91,7 @@ import org.hl7.fhir.r5.model.IntegerType;
 import org.hl7.fhir.r5.model.MarkdownType;
 import org.hl7.fhir.r5.model.OperationOutcome.OperationOutcomeIssueComponent;
 import org.hl7.fhir.r5.model.PrimitiveType;
+import org.hl7.fhir.r5.model.Property;
 import org.hl7.fhir.r5.model.Questionnaire.QuestionnaireItemComponent;
 import org.hl7.fhir.r5.model.Questionnaire.QuestionnaireItemType;
 import org.hl7.fhir.r5.model.StringType;
@@ -900,5 +903,25 @@ public class ToolingExtensions {
       dr.getExtension().add(Factory.newExtension(url, new UriType(value), true));   
   }
 
+  public static boolean usesExtension(String url, Base base) {
+    if ("Extension".equals(base.fhirType())) {
+      Property p = base.getNamedProperty("url");
+      for (Base b : p.getValues()) {
+        if (url.equals(b.primitiveValue())) {
+          return true;
+        }
+      }
+    }
+    
+    for (Property p : base.children() ) {
+      for (Base v : p.getValues()) {
+        if (usesExtension(url, v)) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
   
 }
\ No newline at end of file