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