Return EnumSet if isFlags

Author: Caitlin Bales (MSFT)

Templates/Android/BaseModel.template.tt

@@ -515,7 +515,8 @@ import {0}.generated.*;
 import {0}.options.*;
 import {0}.serializer.*;
 
-import java.util.Arrays;";
+import java.util.Arrays;
+import java.util.EnumSet;";
         return string.Format(format,
             host.CurrentModel.NamespaceName(),
             host.TemplateInfo.OutputParentDirectory);

src/GraphODataTemplateWriter/CodeHelpers/Android/TypeHelperAndroid.cs

@@ -27,6 +27,13 @@ public static string GetReservedPrefix(this OdcmType @type)
 
         public static string GetTypeString(this OdcmType @type)
         {
+            // If isFlags = true, return an EnumSet instead of an enum. This will be 
+            // serialized to and deserialized from a string
+            if (String.Equals(@type.ToString(), "Vipr.Core.CodeModel.OdcmEnum") && @type.AsOdcmEnum().IsFlags)
+            {
+                return "EnumSet<" + @type.Name.ToUpperFirstChar() + ">";
+            }
+
             switch (@type.Name)
             {
                 case "Int16":