Imported Upstream version 5.2.0.179

Former-commit-id: a536d4f20e27294d8bbc2184d75f3a22364f7ba1

external/entityframework/samples/Provider/SampleEntityFrameworkProvider/SpatialDataReader.cs

@@ -0,0 +1,74 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+using System;
+using System.Collections.Generic;
+using System.Data.Spatial;
+using System.Data.SqlClient;
+using System.Data.SqlTypes;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SampleEntityFrameworkProvider
+{
+    internal sealed class SqlSpatialDataReader : DbSpatialDataReader
+    {
+        private readonly SqlDataReader reader;
+        
+        static SqlSpatialDataReader()
+        {
+        }
+
+        public SqlSpatialDataReader(SqlDataReader underlyingReader)
+        {
+            this.reader = underlyingReader;
+        }
+
+        public override DbGeography GetGeography(int ordinal)
+        {
+            EnsureGeographyColumn(ordinal);
+
+            var geographyBytes = this.reader.GetSqlBytes(ordinal);
+            dynamic geography = Activator.CreateInstance(SqlTypes.SqlGeographyType);
+            geography.Read(new BinaryReader(geographyBytes.Stream));
+
+            return SpatialServices.Instance.GeographyFromProviderValue(geography);
+        }
+
+        public override DbGeometry GetGeometry(int ordinal)
+        {
+            EnsureGeometryColumn(ordinal);
+
+            var geometryBytes = this.reader.GetSqlBytes(ordinal);
+            dynamic geometry = Activator.CreateInstance(SqlTypes.SqlGeometryType);
+            geometry.Read(new BinaryReader(geometryBytes.Stream));
+
+            return SpatialServices.Instance.GeometryFromProviderValue(geometry);
+        }
+
+        private void EnsureGeographyColumn(int ordinal)
+        {
+            string fieldTypeName = this.reader.GetDataTypeName(ordinal);
+            if (!fieldTypeName.EndsWith("sys.geography", StringComparison.Ordinal)) // Use EndsWith so that we just see the schema and type name, not the database name.
+            {
+                throw new InvalidOperationException(
+                       string.Format(
+                           "Expected a geography value, found a value of type {0}.",
+                           fieldTypeName));
+            }
+        }
+
+        private void EnsureGeometryColumn(int ordinal)
+        {
+            string fieldTypeName = this.reader.GetDataTypeName(ordinal);
+            if (!fieldTypeName.EndsWith("sys.geometry", StringComparison.Ordinal)) // Use EndsWith so that we just see the schema and type name, not the database name.
+            {
+                throw new InvalidOperationException(
+                    string.Format(
+                        "Expected a geometry value, found a value of type {0}.",
+                        fieldTypeName));
+            }
+        }
+    }
+}