45 lines
2.0 KiB
C#
45 lines
2.0 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="SpatialHelpers.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner willa
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// @backupOwner [....]
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//------------------------------------------------------------------------------
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using System.Diagnostics;
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using System.Data.Metadata.Edm;
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using System.Data.Common;
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namespace System.Data.Spatial
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{
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internal static class SpatialHelpers
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{
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internal static object GetSpatialValue(MetadataWorkspace workspace, DbDataReader reader, TypeUsage columnType, int columnOrdinal)
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{
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Debug.Assert(Helper.IsSpatialType(columnType));
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DbSpatialDataReader spatialReader = CreateSpatialDataReader(workspace, reader);
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if (Helper.IsGeographicType((PrimitiveType)columnType.EdmType))
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{
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return spatialReader.GetGeography(columnOrdinal);
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}
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else
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{
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return spatialReader.GetGeometry(columnOrdinal);
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}
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}
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internal static DbSpatialDataReader CreateSpatialDataReader(MetadataWorkspace workspace, DbDataReader reader)
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{
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StoreItemCollection storeItemCollection = (StoreItemCollection)workspace.GetItemCollection(DataSpace.SSpace);
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DbProviderFactory providerFactory = storeItemCollection.StoreProviderFactory;
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Debug.Assert(providerFactory != null, "GetProviderSpatialServices requires provider factory to have been initialized");
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DbProviderServices providerServices = DbProviderServices.GetProviderServices(providerFactory);
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DbSpatialDataReader result = providerServices.GetSpatialDataReader(reader, storeItemCollection.StoreProviderManifestToken);
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Debug.Assert(result != null, "DbProviderServices did not throw ProviderIncompatibleException for null IDbSpatialDataReader");
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return result;
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}
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}
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}
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