#region Apache Notice
/*****************************************************************************
* $Revision: 374175 $
* $LastChangedDate: 2006-05-08 15:21:44 +0200 (lun., 08 mai 2006) $
* $LastChangedBy: gbayon $
*
* iBATIS.NET Data Mapper
* Copyright (C) 2006/2005 - The Apache Software Foundation
*
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
********************************************************************************/
#endregion
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.CompilerServices;
using IBatisNet.Common.Exceptions;
namespace IBatisNet.Common.Utilities.Objects.Members{
/// <summary>
/// A factory to build IMemberAccessor for a type.
/// </summary>
public class MemberAccessorFactory : IMemberAccessorFactory
{
private delegate IMemberAccessor CreateMemberPropertyAccessor(Type targetType, string propertyName);
private delegate IMemberAccessor CreateMemberFieldAccessor(Type targetType, string fieldName);
private CreateMemberPropertyAccessor _createPropertyAccessor = null;
private CreateMemberFieldAccessor _createFieldAccessor = null;
private IDictionary _cachedIMemberAccessor = new HybridDictionary();
private AssemblyBuilder _assemblyBuilder = null;
private ModuleBuilder _moduleBuilder = null;
private object _syncObject = new object();
/// <summary>
/// Initializes a new instance of the <see cref="T:MemberAccessorFactory"/> class.
/// </summary>
/// <param name="allowCodeGeneration">if set to <c>true</c> [allow code generation].</param>
public MemberAccessorFactory(bool allowCodeGeneration)
{
if (allowCodeGeneration)
{
// Detect runtime environment and create the appropriate factory
if (Environment.Version.Major >= 2)
{
#if dotnet2
_createPropertyAccessor = new CreateMemberPropertyAccessor(CreateDelegatePropertyAccessor);
_createFieldAccessor = new CreateMemberFieldAccessor(CreateDynamicFieldAccessor);
#endif
}
else
{
AssemblyName assemblyName = new AssemblyName();
assemblyName.Name = "iBATIS.FastPropertyAccessor"+HashCodeProvider.GetIdentityHashCode(this).ToString();
// Create a new assembly with one module
_assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
_moduleBuilder = _assemblyBuilder.DefineDynamicModule(assemblyName.Name + ".dll");
_createPropertyAccessor = new CreateMemberPropertyAccessor(CreateEmitPropertyAccessor);
_createFieldAccessor = new CreateMemberFieldAccessor(CreateFieldAccessor);
}
}
else
{
_createPropertyAccessor = new CreateMemberPropertyAccessor(CreateReflectionPropertyAccessor);
_createFieldAccessor = new CreateMemberFieldAccessor(CreateReflectionFieldAccessor);
}
}
/// <summary>
/// Generate an IMemberAccessor object
/// </summary>
/// <param name="targetType">Target object type.</param>
/// <param name="name">Field or Property name.</param>
/// <returns>null if the generation fail</returns>
[MethodImpl(MethodImplOptions.Synchronized)]
public IMemberAccessor CreateMemberAccessor(Type targetType, string name)
{
string key = targetType.FullName+name;
if (_cachedIMemberAccessor.Contains(key))
{
return (IMemberAccessor)_cachedIMemberAccessor[key];
}
else
{
IMemberAccessor memberAccessor = null;
lock (_syncObject)
{
if (!_cachedIMemberAccessor.Contains(key))
{
// Property
PropertyInfo propertyInfo = targetType.GetProperty(name);
if (propertyInfo!=null)
{
memberAccessor = _createPropertyAccessor(targetType, name);
_cachedIMemberAccessor[key] = memberAccessor;
}
else
{
// Field
FieldInfo fieldInfo = targetType.GetField(name, BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public);
if (fieldInfo!=null)
{
memberAccessor = _createFieldAccessor(targetType, name);
_cachedIMemberAccessor[key] = memberAccessor;
}
else
{
throw new ProbeException(
string.Format("No property or field named \"{0}\" exists for type "
+ "{1}.",name, targetType));
}
}
}
else
{
memberAccessor = (IMemberAccessor)_cachedIMemberAccessor[key];
}
}
return memberAccessor;
}
}
#if dotnet2
/// <summary>
/// Create a Dynamic IMemberAccessor instance for a property
/// </summary>
/// <param name="targetType">Target object type.</param>
/// <param name="propertyName">Property name.</param>
/// <returns>null if the generation fail</returns>
private IMemberAccessor CreateDelegatePropertyAccessor(Type targetType, string propertyName)
{
return new DelegatePropertyAccessor(targetType, propertyName);
}
/// <summary>
/// Create a Dynamic IMemberAccessor instance for a field
/// </summary>
/// <param name="targetType">Target object type.</param>
/// <param name="fieldName">Property name.</param>
/// <returns>null if the generation fail</returns>
private IMemberAccessor CreateDynamicFieldAccessor(Type targetType, string fieldName)
{
FieldInfo fieldInfo = targetType.GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public);
if (fieldInfo.IsPublic)
{
return new DelegateFieldAccessor(targetType, fieldName);
}
else
{
return new ReflectionFieldAccessor(targetType, fieldName);
}
}
#endif
/// <summary>
/// Create an IL IMemberAccessor instance for a property
/// </summary>
/// <param name="targetType">Target object type.</param>
/// <param name="propertyName">Property name.</param>
/// <returns>null if the generation fail</returns>
private IMemberAccessor CreateEmitPropertyAccessor(Type targetType, string propertyName)
{
return new EmitPropertyAccessor(targetType, propertyName, _assemblyBuilder, _moduleBuilder);
}
/// <summary>
/// Create a IMemberAccessor instance for a fiedl
/// </summary>
/// <param name="targetType">Target object type.</param>
/// <param name="fieldName">Field name.</param>
/// <returns>null if the generation fail</returns>
private IMemberAccessor CreateFieldAccessor(Type targetType, string fieldName)
{
FieldInfo fieldInfo = targetType.GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public);
if (fieldInfo.IsPublic)
{
return new EmitFieldAccessor(targetType, fieldName, _assemblyBuilder, _moduleBuilder);
}
else
{
return new ReflectionFieldAccessor(targetType, fieldName);
}
}
/// <summary>
/// Create a Reflection IMemberAccessor instance for a property
/// </summary>
/// <param name="targetType">Target object type.</param>
/// <param name="propertyName">Property name.</param>
/// <returns>null if the generation fail</returns>
private IMemberAccessor CreateReflectionPropertyAccessor(Type targetType, string propertyName)
{
return new ReflectionPropertyAccessor(targetType, propertyName);
}
/// <summary>
/// Create Reflection IMemberAccessor instance for a field
/// </summary>
/// <param name="targetType">Target object type.</param>
/// <param name="fieldName">field name.</param>
/// <returns>null if the generation fail</returns>
private IMemberAccessor CreateReflectionFieldAccessor(Type targetType, string fieldName)
{
return new ReflectionFieldAccessor(targetType, fieldName);
}
}
}
|