Fix some compile issues

hapi-fhir-structures-dstu2.1/src/main/java/org/hl7/fhir/dstu2016may/metamodel/Manager.java

@@ -1,29 +1,30 @@
-package org.hl7.fhir.dstu2016may.metamodel;
-
-import java.io.InputStream;
-import java.io.OutputStream;
-
-import org.hl7.fhir.dstu2016may.formats.IParser.OutputStyle;
-import org.hl7.fhir.dstu2016may.utils.IWorkerContext;
-
-public class Manager {
-
-  public enum FhirFormat { XML, JSON, JSONLD, TURTLE }
-  
-  public static Element parse(IWorkerContext context, InputStream source, FhirFormat inputFormat) throws Exception {
-    return makeParser(context, inputFormat).parse(source);
-  }
-
-  public static void compose(IWorkerContext context, Element e, OutputStream destination, FhirFormat outputFormat, OutputStyle style, String base) throws Exception {
-    makeParser(context, outputFormat).compose(e, destination, style, base);
-  }
-
-  public static ParserBase makeParser(IWorkerContext context, FhirFormat format) {
-    switch (format) {
-    case JSON : return new JsonParser(context);
-    case XML : return new XmlParser(context);
-    }
-    return null;
-  }
-  
-}
+package org.hl7.fhir.dstu2016may.metamodel;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import org.hl7.fhir.dstu2016may.formats.IParser.OutputStyle;
+import org.hl7.fhir.dstu2016may.utils.IWorkerContext;
+
+public class Manager {
+
+  public enum FhirFormat { XML, JSON, JSONLD, TURTLE }
+  
+  public static Element parse(IWorkerContext context, InputStream source, FhirFormat inputFormat) throws Exception {
+    return makeParser(context, inputFormat).parse(source);
+  }
+
+  public static void compose(IWorkerContext context, Element e, OutputStream destination, FhirFormat outputFormat, OutputStyle style, String base) throws Exception {
+    makeParser(context, outputFormat).compose(e, destination, style, base);
+  }
+
+  public static ParserBase makeParser(IWorkerContext context, FhirFormat format) {
+    switch (format) {
+    case JSON : return new JsonParser(context);
+    case XML : return new XmlParser(context);
+    default:
+      throw new IllegalArgumentException("Unknown type: " + format);
+    }
+  }
+  
+}