96 lines
4.3 KiB
C#
96 lines
4.3 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="EntityProviderServices.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 [....]
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// @backupOwner [....]
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//------------------------------------------------------------------------------
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namespace System.Data.EntityClient {
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using System.Data.Common;
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using System.Data.Common.CommandTrees;
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using System.Data.Entity;
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using System.Data.Metadata.Edm;
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using System.Diagnostics;
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/// <summary>
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/// The class for provider services of the entity client
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/// </summary>
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internal sealed class EntityProviderServices : DbProviderServices {
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/// <summary>
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/// Singleton object;
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/// </summary>
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internal static readonly EntityProviderServices Instance = new EntityProviderServices();
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/// <summary>
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/// Create a Command Definition object, given the connection and command tree
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/// </summary>
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/// <param name="connection">connection to the underlying provider</param>
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/// <param name="commandTree">command tree for the statement</param>
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/// <returns>an exectable command definition object</returns>
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/// <exception cref="ArgumentNullException">connection and commandTree arguments must not be null</exception>
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protected override DbCommandDefinition CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree) {
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EntityUtil.CheckArgumentNull(providerManifest, "providerManifest");
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EntityUtil.CheckArgumentNull(commandTree, "commandTree");
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StoreItemCollection storeMetadata = (StoreItemCollection)commandTree.MetadataWorkspace.GetItemCollection(DataSpace.SSpace);
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return this.CreateCommandDefinition(storeMetadata.StoreProviderFactory, commandTree);
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}
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internal EntityCommandDefinition CreateCommandDefinition(DbProviderFactory storeProviderFactory, DbCommandTree commandTree) {
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EntityUtil.CheckArgumentNull(storeProviderFactory, "storeProviderFactory");
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Debug.Assert(commandTree != null, "Command Tree cannot be null");
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return new EntityCommandDefinition(storeProviderFactory, commandTree);
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}
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/// <summary>
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/// Ensures that the data space of the specified command tree is the model (C-) space
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/// </summary>
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/// <param name="commandTree">The command tree for which the data space should be validated</param>
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internal override void ValidateDataSpace(DbCommandTree commandTree)
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{
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Debug.Assert(commandTree != null, "Ensure command tree is non-null before calling ValidateDataSpace");
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if (commandTree.DataSpace != DataSpace.CSpace)
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{
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throw EntityUtil.ProviderIncompatible(Strings.EntityClient_RequiresNonStoreCommandTree);
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}
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}
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/// <summary>
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/// Create a EntityCommandDefinition object based on the prototype command
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/// This method is intended for provider writers to build a default command definition
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/// from a command.
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/// </summary>
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/// <param name="prototype"></param>
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/// <returns></returns>
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/// <exception cref="ArgumentNullException">prototype argument must not be null</exception>
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/// <exception cref="InvalidCastException">prototype argument must be a EntityCommand</exception>
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public override DbCommandDefinition CreateCommandDefinition(DbCommand prototype) {
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EntityUtil.CheckArgumentNull(prototype, "prototype");
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return ((EntityCommand)prototype).GetCommandDefinition();
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}
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protected override string GetDbProviderManifestToken(DbConnection connection)
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{
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EntityUtil.CheckArgumentNull(connection, "connection");
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if (connection.GetType() != typeof(EntityConnection))
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{
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throw EntityUtil.Argument(System.Data.Entity.Strings.Mapping_Provider_WrongConnectionType(typeof(EntityConnection)));
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}
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return MetadataItem.EdmProviderManifest.Token;
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}
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protected override DbProviderManifest GetDbProviderManifest(string versionHint)
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{
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EntityUtil.CheckArgumentNull(versionHint, "versionHint");
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return MetadataItem.EdmProviderManifest;
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}
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}
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}
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