/********************************************************
* ADO.NET 2.0 Data Provider for SQLite Version 3.X
* Written by Robert Simpson (robert@blackcastlesoft.com)
*
* Released to the public domain, use at your own risk!
********************************************************/
namespace System.Data.SQLite
{
using System;
using System.Globalization;
using System.Reflection;
using System.Security.Permissions;
///
/// SQLite implementation of .
///
public sealed partial class SQLiteFactory : IServiceProvider
{
//
// TODO: This points to the legacy "System.Data.SQLite.Linq" assembly
// (i.e. the one that does not support Entity Framework 6).
// Currently, this class and its containing assembly (i.e.
// "System.Data.SQLite") know nothing about the Entity Framework
// 6 compatible assembly (i.e. "System.Data.SQLite.EF6"). This
// situation may need to change.
//
private static readonly string DefaultTypeName =
"System.Data.SQLite.Linq.SQLiteProviderServices, System.Data.SQLite.Linq, " +
"Version={0}, Culture=neutral, PublicKeyToken=db937bc2d44ff139";
private static readonly BindingFlags DefaultBindingFlags =
BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance;
///////////////////////////////////////////////////////////////////////////
private static Type _dbProviderServicesType;
private static object _sqliteServices;
static SQLiteFactory()
{
#if (SQLITE_STANDARD || USE_INTEROP_DLL || PLATFORM_COMPACTFRAMEWORK) && PRELOAD_NATIVE_LIBRARY
UnsafeNativeMethods.Initialize();
#endif
#if USE_INTEROP_DLL && INTEROP_LOG
if (UnsafeNativeMethods.sqlite3_config_log_interop() == SQLiteErrorCode.Ok)
{
UnsafeNativeMethods.sqlite3_log(
SQLiteErrorCode.Ok, SQLiteConvert.ToUTF8("logging initialized."));
}
#endif
SQLiteLog.Initialize();
string version =
#if NET_40 || NET_45 || NET_451 || NET_452 || NET_46 || NET_461
"4.0.0.0";
#else
"3.5.0.0";
#endif
_dbProviderServicesType = Type.GetType(HelperMethods.StringFormat(CultureInfo.InvariantCulture, "System.Data.Common.DbProviderServices, System.Data.Entity, Version={0}, Culture=neutral, PublicKeyToken=b77a5c561934e089", version), false);
}
///
/// Will provide a object in .NET 3.5.
///
/// The class or interface type to query for.
///
object IServiceProvider.GetService(Type serviceType)
{
if (serviceType == typeof(ISQLiteSchemaExtensions) ||
(_dbProviderServicesType != null && serviceType == _dbProviderServicesType))
{
return GetSQLiteProviderServicesInstance();
}
return null;
}
[ReflectionPermission(SecurityAction.Assert, MemberAccess = true)]
private object GetSQLiteProviderServicesInstance()
{
if (_sqliteServices == null)
{
string typeName = UnsafeNativeMethods.GetSettingValue(
"TypeName_SQLiteProviderServices", null);
Version version = this.GetType().Assembly.GetName().Version;
if (typeName != null)
{
typeName = HelperMethods.StringFormat(
CultureInfo.InvariantCulture, typeName, version);
}
else
{
typeName = HelperMethods.StringFormat(
CultureInfo.InvariantCulture, DefaultTypeName, version);
}
Type type = Type.GetType(typeName, false);
if (type != null)
{
FieldInfo field = type.GetField(
"Instance", DefaultBindingFlags);
if (field != null)
_sqliteServices = field.GetValue(null);
}
}
return _sqliteServices;
}
}
}