--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/TypeBuilder/InstanceTypeAttribute.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,180 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+
+using BLToolkit.Reflection;
+
+namespace BLToolkit.TypeBuilder
+{
+	///<summary>
+	/// Specifies a value holder type.
+	///</summary>
+	[SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes")]
+	[AttributeUsage(AttributeTargets.Property)]
+	public class InstanceTypeAttribute : Builders.AbstractTypeBuilderAttribute
+	{
+		///<summary>
+		/// Initializes a new instance of the InstanceTypeAttribute class.
+		///</summary>
+		///<param name="instanceType">The <see cref="System.Type"/> of an instance.</param>
+		public InstanceTypeAttribute(Type instanceType)
+		{
+			_instanceType = instanceType;
+		}
+
+		///<summary>
+		/// Initializes a new instance of the InstanceTypeAttribute class.
+		///</summary>
+		///<param name="instanceType">The <see cref="System.Type"/> of an instance.</param>
+		///<param name="parameter1">An additional parameter.</param>
+		///<seealso cref="Parameters"/>
+		public InstanceTypeAttribute(Type instanceType, object parameter1)
+		{
+			_instanceType = instanceType;
+			SetParameters(parameter1);
+		}
+
+		///<summary>
+		/// Initializes a new instance of the InstanceTypeAttribute class.
+		///</summary>
+		///<param name="instanceType">The <see cref="System.Type"/> of an instance.</param>
+		///<param name="parameter1">An additional parameter.</param>
+		///<param name="parameter2">An additional parameter.</param>
+		///<seealso cref="Parameters"/>
+		public InstanceTypeAttribute(Type instanceType,
+			object parameter1,
+			object parameter2)
+		{
+			_instanceType = instanceType;
+			SetParameters(parameter1, parameter2);
+		}
+
+		///<summary>
+		/// Initializes a new instance of the InstanceTypeAttribute class.
+		///</summary>
+		///<param name="instanceType">The <see cref="System.Type"/> of an instance.</param>
+		///<param name="parameter1">An additional parameter.</param>
+		///<param name="parameter2">An additional parameter.</param>
+		///<param name="parameter3">An additional parameter.</param>
+		///<seealso cref="Parameters"/>
+		public InstanceTypeAttribute(Type instanceType,
+			object parameter1,
+			object parameter2,
+			object parameter3)
+		{
+			_instanceType = instanceType;
+			SetParameters(parameter1, parameter2, parameter3);
+		}
+
+		///<summary>
+		/// Initializes a new instance of the InstanceTypeAttribute class.
+		///</summary>
+		///<param name="instanceType">The <see cref="System.Type"/> of an instance.</param>
+		///<param name="parameter1">An additional parameter.</param>
+		///<param name="parameter2">An additional parameter.</param>
+		///<param name="parameter3">An additional parameter.</param>
+		///<param name="parameter4">An additional parameter.</param>
+		///<seealso cref="Parameters"/>
+		public InstanceTypeAttribute(Type instanceType,
+			object parameter1,
+			object parameter2,
+			object parameter3,
+			object parameter4)
+		{
+			_instanceType = instanceType;
+			SetParameters(parameter1, parameter2, parameter3, parameter4);
+		}
+
+		///<summary>
+		/// Initializes a new instance of the InstanceTypeAttribute class.
+		///</summary>
+		///<param name="instanceType">The <see cref="System.Type"/> of an instance.</param>
+		///<param name="parameter1">An additional parameter.</param>
+		///<param name="parameter2">An additional parameter.</param>
+		///<param name="parameter3">An additional parameter.</param>
+		///<param name="parameter4">An additional parameter.</param>
+		///<param name="parameter5">An additional parameter.</param>
+		///<seealso cref="Parameters"/>
+		public InstanceTypeAttribute(Type instanceType,
+			object parameter1,
+			object parameter2,
+			object parameter3,
+			object parameter4,
+			object parameter5)
+		{
+			_instanceType = instanceType;
+			SetParameters(parameter1, parameter2, parameter3, parameter4, parameter5);
+		}
+
+		///<summary>
+		/// Initializes a new instance of the InstanceTypeAttribute class.
+		///</summary>
+		///<param name="instanceType">The <see cref="System.Type"/> of an instance.</param>
+		///<param name="parameter1">An additional parameter.</param>
+		///<param name="parameters">More additional parameters.</param>
+		///<seealso cref="Parameters"/>
+		public InstanceTypeAttribute(Type instanceType, object parameter1, params object[] parameters)
+		{
+			_instanceType = instanceType;
+
+			// Note: we can not use something like
+			// public InstanceTypeAttribute(Type instanceType, params object[] parameters)
+			// because [InstanceType(typeof(Foo), new object[] {1,2,3})] will be treated as
+			// [InstanceType(typeof(Foo), 1, 2, 3)] so it will be not possible to specify
+			// an instance type with array as the type of the one and only parameter.
+			// An extra parameter of type object made it successul.
+
+			int len = parameters.Length;
+			Array.Resize(ref parameters, len + 1);
+			Array.ConstrainedCopy(parameters, 0, parameters, 1, len);
+			parameters[0] = parameter1;
+
+			SetParameters(parameters);
+		}
+
+		protected void SetParameters(params object[] parameters)
+		{
+			_parameters = parameters;
+		}
+
+		private object[] _parameters;
+		///<summary>
+		/// Any additional parameters passed to a value holder constructor
+		/// with <see cref="InitContext"/> parameter.
+		///</summary>
+		public  object[]  Parameters
+		{
+			get { return _parameters;  }
+		}
+
+		private readonly Type _instanceType;
+		protected        Type  InstanceType
+		{
+			get { return _instanceType; }
+		}
+
+		private bool _isObjectHolder;
+		///<summary>
+		/// False (default value) for holders for scalar types,
+		/// true for holders for complex objects.
+		///</summary>
+		public  bool  IsObjectHolder
+		{
+			get { return _isObjectHolder;  }
+			set { _isObjectHolder = value; }
+		}
+
+		private         Builders.IAbstractTypeBuilder _typeBuilder;
+		///<summary>
+		/// An <see cref="Builders.IAbstractTypeBuilder"/> required for this attribute
+		/// to build an abstract type inheritor.
+		///</summary>
+		public override Builders.IAbstractTypeBuilder  TypeBuilder
+		{
+			get
+			{
+				return _typeBuilder ?? (_typeBuilder = 
+					new Builders.InstanceTypeBuilder(_instanceType, _isObjectHolder));
+			}
+		}
+	}
+}