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//---------------------------------------------------------------------
// <copyright file="EntityProviderFactory.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Security;
using System.Security.Permissions;
namespace System.Data.EntityClient
{
/// <summary>
/// Class representing a provider factory for the entity client provider
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2302", Justification="We don't expect serviceType to be an Embedded Interop Types.")]
public sealed class EntityProviderFactory : DbProviderFactory, IServiceProvider
{
/// <summary>
/// A singleton object for the entity client provider factory object
/// </summary>
[SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "EntityProviderFactory implements the singleton pattern and it's stateless. This is needed in order to work with DbProviderFactories.")]
public static readonly EntityProviderFactory Instance = new EntityProviderFactory();
/// <summary>
/// Constructs the EntityProviderFactory object, this is private as users shouldn't create it directly
/// </summary>
private EntityProviderFactory()
{
}
/// <summary>
/// Creates a EntityCommand object and returns it
/// </summary>
/// <returns>A EntityCommand object</returns>
public override DbCommand CreateCommand()
{
return new EntityCommand();
}
/// <summary>
/// Creates a EntityCommandBuilder object and returns it
/// </summary>
/// <returns>A EntityCommandBuilder object</returns>
/// <exception cref="NotSupportedException"></exception>
public override DbCommandBuilder CreateCommandBuilder()
{
throw EntityUtil.NotSupported();
}
/// <summary>
/// Creates a EntityConnection object and returns it
/// </summary>
/// <returns>A EntityConnection object</returns>
public override DbConnection CreateConnection()
{
return new EntityConnection();
}
/// <summary>
/// Creates a EntityConnectionStringBuilder object and returns it
/// </summary>
/// <returns>A EntityConnectionStringBuilder object</returns>
public override DbConnectionStringBuilder CreateConnectionStringBuilder()
{
return new EntityConnectionStringBuilder();
}
/// <summary>
/// Creates a DbDataAdapter object and returns it, this method is currently not supported
/// </summary>
/// <returns>A DbDataAdapter object</returns>
/// <exception cref="NotSupportedException"></exception>
public override DbDataAdapter CreateDataAdapter()
{
throw EntityUtil.NotSupported();
}
/// <summary>
/// Creates a EntityParameter object and returns it
/// </summary>
/// <returns>A EntityParameter object</returns>
public override DbParameter CreateParameter()
{
return new EntityParameter();
}
/// <summary>
/// Creates a CodeAccessPermission object and returns it
/// </summary>
/// <param name="state">The permission state level for the code access</param>
/// <returns>A CodeAccessPermission object</returns>
public override CodeAccessPermission CreatePermission(PermissionState state)
{
throw EntityUtil.NotSupported();
}
/// <summary>
/// Extension mechanism for additional services;
/// </summary>
/// <returns>requested service provider or null.</returns>
object IServiceProvider.GetService(Type serviceType) {
object result = null;
if (serviceType == typeof(DbProviderServices)) {
result = EntityProviderServices.Instance;
}
else if (serviceType == typeof(IEntityAdapter)) {
result = new EntityAdapter();
}
return result;
}
}
}
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