using System;

namespace Chernobyl.Attribution
{
    /// <summary>
    /// Applies a type based ID on an attributable item.
    /// </summary>
    [AttributeUsage(AttributeTargets.All, AllowMultiple = true)]
    public class TypeAttribute : Attribute, IKeyAttribute<Type>
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="TypeAttribute"/> class.
        /// </summary>
        /// <param name="key">The key of the item attributed.</param>
        public TypeAttribute(Type key)
        {
            Key = key;
        }

        /// <summary>
        /// The key of the item attributed.
        /// </summary>
        public Type Key { get; private set; }

        /// <summary>
        /// The key of the item attributed.
        /// </summary>
        object IKeyAttribute.Key
        {
            get { return Key; }
        }
    }
}