using System;
using System.Diagnostics.CodeAnalysis;

namespace BLToolkit.Mapping
{
    [SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes")]
    [AttributeUsage(
        AttributeTargets.Class | AttributeTargets.Interface |
        AttributeTargets.Property | AttributeTargets.Field | 
        AttributeTargets.Enum,
        AllowMultiple=true)]
    public class NullValueAttribute : Attribute
    {
        public NullValueAttribute()
        {
        }

        public NullValueAttribute(object value)
        {
            _value = value;
        }

        public NullValueAttribute(Type type, object value)
        {
            _type  = type;
            _value = value;
        }

        private readonly object _value;
        public           object  Value
        {
            get { return _value; }
        }

        private readonly Type _type;
        public           Type  Type
        {
            get { return _type; }
        }
    }
}