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