/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
#if !CLR2
using System.Linq.Expressions;
#else
using Microsoft.Scripting.Ast;
#endif
using System;
namespace Microsoft.Scripting.Runtime{
/// <summary>
/// Marks a class in the assembly as being an extension type for another type.
/// </summary>
[AttributeUsage(AttributeTargets.Assembly, Inherited = false, AllowMultiple = true)]
public sealed class ExtensionTypeAttribute : Attribute {
private readonly Type _extensionType;
private readonly Type _extends;
/// <summary>
/// Marks a type in the assembly as being an extension type for another type.
/// </summary>
/// <param name="extends">The type which is being extended</param>
/// <param name="extensionType">The type which provides the extension members.</param>
public ExtensionTypeAttribute(Type extends, Type extensionType) {
if (extends == null) {
throw new ArgumentNullException("extends");
}
if (extensionType != null && !extensionType.IsPublic && !extensionType.IsNestedPublic) {
throw Error.ExtensionMustBePublic(extensionType.FullName);
}
_extends = extends;
_extensionType = extensionType;
}
/// <summary>
/// The type which contains extension members which are added to the type being extended.
/// </summary>
public Type ExtensionType {
get {
return _extensionType;
}
}
/// <summary>
/// The type which is being extended by the extension type.
/// </summary>
public Type Extends {
get {
return _extends;
}
}
}
}
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