Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web.DynamicData/DynamicData/ModelProviders/SchemaCreator.cs

@@ -0,0 +1,44 @@
+using System.Data.Linq;
+using System.Data.Objects;
+using System.Globalization;
+using System.Web.Resources;
+
+namespace System.Web.DynamicData.ModelProviders {
+    internal class SchemaCreator {
+        private static SchemaCreator s_instance = new SchemaCreator();
+
+        public static SchemaCreator Instance {
+            get {
+                return s_instance;
+            }
+        }
+
+        public virtual DataModelProvider CreateDataModel(object contextInstance, Func<object> contextFactory) {
+            if (IsDataContext(contextInstance.GetType())) {
+                return new DLinqDataModelProvider(contextInstance, contextFactory);
+            }
+            if (IsObjectContext(contextInstance.GetType())) {
+                return new EFDataModelProvider(contextInstance, contextFactory);
+            }
+
+            throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, DynamicDataResources.SchemaCreator_UnknownModel, contextInstance.GetType().FullName));
+        }
+
+        public virtual bool ValidDataContextType(Type contextType) {
+            // 
+            return IsDataContext(contextType) || IsObjectContext(contextType);
+        }
+
+        internal static bool IsDataContext(Type contextType) {
+            return IsValidType<DataContext>(contextType);
+        }
+
+        internal static bool IsObjectContext(Type contextType) {
+            return IsValidType<ObjectContext>(contextType);
+        }
+
+        private static bool IsValidType<T>(Type contextType) where T : class {
+            return contextType != null && typeof(T).IsAssignableFrom(contextType);
+        }
+    }
+}