From 2d8885d4e368f7f8f1794a62fc02fc83195309cf Mon Sep 17 00:00:00 2001
From: Oliver Egger <oliver.egger@ahdis.ch>
Date: Tue, 29 Nov 2022 22:15:02 +0100
Subject: [PATCH] FHIR Mapping Language: cast support for more types #1019

---
 .../structuremap/StructureMapUtilities.java   | 47 +++++++++++++++++--
 .../r5/test/StructureMapUtilitiesTest.java    | 20 ++++++++
 2 files changed, 63 insertions(+), 4 deletions(-)

diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/structuremap/StructureMapUtilities.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/structuremap/StructureMapUtilities.java
index 0933e93e0..045eb89e1 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/structuremap/StructureMapUtilities.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/structuremap/StructureMapUtilities.java
@@ -1707,10 +1707,49 @@ public class StructureMapUtilities {
           if (tgt.getParameter().size() == 1)
             throw new FHIRException("Implicit type parameters on cast not yet supported");
           String t = getParamString(vars, tgt.getParameter().get(1));
-          if (t.equals("string"))
-            return new StringType(src);
-          else
-            throw new FHIRException("cast to " + t + " not yet supported");
+          switch(t) {
+            case "boolean":
+              return new BooleanType(src);
+            case "integer":
+              return new IntegerType(src);
+            case  "integer64":
+              return new Integer64Type(src);
+            case  "string":
+              return new StringType(src);
+            case  "decimal":
+              return new DecimalType(src);
+            case  "uri":
+              return new UriType(src);
+            case  "base64Binary":
+              return new Base64BinaryType(src);
+            case  "instant":
+              return new InstantType(src);
+            case  "date":
+              return new DateType(src);
+            case  "dateTime":
+              return new DateTimeType(src);
+            case  "time":
+              return new TimeType(src);
+            case  "code":
+              return new CodeType(src);
+            case  "oid":
+              return new OidType(src);
+            case  "id":
+              return new IdType(src);
+            case  "markdown":
+              return new MarkdownType(src);
+            case  "unsignedInt":
+              return new UnsignedIntType(src);
+            case  "positiveInt":
+              return new PositiveIntType(src);
+            case  "uuid":
+              return new UuidType(src);
+            case  "url":
+              return new UrlType(src);
+            case  "canonical":
+              return new CanonicalType(src);
+          }
+          throw new FHIRException("cast to " + t + " not yet supported");
         case APPEND:
           StringBuilder sb = new StringBuilder(getParamString(vars, tgt.getParameter().get(0)));
           for (int i = 1; i < tgt.getParameter().size(); i++)
diff --git a/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/StructureMapUtilitiesTest.java b/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/StructureMapUtilitiesTest.java
index eeb9dc21b..04163b4f0 100644
--- a/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/StructureMapUtilitiesTest.java
+++ b/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/StructureMapUtilitiesTest.java
@@ -5,11 +5,15 @@ import java.util.List;
 
 import org.hl7.fhir.exceptions.FHIRException;
 import org.hl7.fhir.r5.context.SimpleWorkerContext;
+import org.hl7.fhir.r5.elementmodel.Element;
+import org.hl7.fhir.r5.elementmodel.Manager;
+import org.hl7.fhir.r5.elementmodel.Manager.FhirFormat;
 import org.hl7.fhir.r5.model.Base;
 import org.hl7.fhir.r5.model.Coding;
 import org.hl7.fhir.r5.model.StructureMap;
 import org.hl7.fhir.r5.model.StructureMap.StructureMapGroupRuleTargetComponent;
 import org.hl7.fhir.r5.test.utils.TestingUtilities;
+import org.hl7.fhir.r5.utils.FHIRPathEngine;
 import org.hl7.fhir.r5.utils.structuremap.ITransformerServices;
 import org.hl7.fhir.r5.utils.structuremap.StructureMapUtilities;
 import org.hl7.fhir.utilities.npm.FilesystemPackageCacheManager;
@@ -37,6 +41,22 @@ public class StructureMapUtilitiesTest implements ITransformerServices {
     // StructureMap/ActivityDefinition3to4: StructureMap.group[3].rule[2].name error id value '"expression"' is not valid
     Assertions.assertEquals("expression", structureMap.getGroup().get(2).getRule().get(1).getName());
   }
+  
+  @Test
+  public void testCast() throws IOException, FHIRException {
+    // org.hl7.fhir.exceptions.FHIRException: Exception executing transform ext.value = cast(value, 'positiveInt') on Rule "item": cast to positiveInt not yet supported
+    StructureMapUtilities scu = new StructureMapUtilities(context, this);
+    String fileMap = TestingUtilities.loadTestResource("r5", "structure-mapping", "cast.map");
+    Element source = Manager.parseSingle(context, TestingUtilities.loadTestResourceStream("r5", "structure-mapping", "qrext.json"), FhirFormat.JSON);
+    StructureMap structureMap = scu.parse(fileMap, "cast");
+    Element target = Manager.build(context, scu.getTargetType(structureMap));
+    scu.transform(null, source, structureMap, target);
+    FHIRPathEngine fp = new FHIRPathEngine(context);
+    Assertions.assertEquals("implicit",fp.evaluateToString(target, "extension[0].value"));
+    Assertions.assertEquals("explicit",fp.evaluateToString(target, "extension[1].value"));
+    Assertions.assertEquals("2147483647",fp.evaluateToString(target, "extension[2].value"));
+    Assertions.assertEquals("2147483647",fp.evaluateToString(target, "extension[3].value"));
+  }
 
   private void assertSerializeDeserialize(StructureMap structureMap) {
     Assertions.assertEquals("syntax", structureMap.getName());