mono/mcs/class/System/System.ComponentModel/ImmutableObjectAttribute.cs

//
// System.ComponentModel.ImmutableObjectAttribute
//
// Authors:
//  Martin Willemoes Hansen ([email protected])
//  Andreas Nahr ([email protected])
//
// (C) 2003 Martin Willemoes Hansen
// (C) 2003 Andreas Nahr
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

namespace System.ComponentModel
{
	[AttributeUsage(AttributeTargets.All)]
	public sealed class ImmutableObjectAttribute : Attribute
	{

		private bool immutable;

		public static readonly ImmutableObjectAttribute Default = new ImmutableObjectAttribute (false);
		public static readonly ImmutableObjectAttribute No = new ImmutableObjectAttribute (false);
		public static readonly ImmutableObjectAttribute Yes = new ImmutableObjectAttribute (true);


		public ImmutableObjectAttribute (bool immutable)
		{
			this.immutable=immutable;
		}

		public bool Immutable {
			get { return this.immutable; }
		}

		public override bool Equals (object obj)
		{
			if (!(obj is ImmutableObjectAttribute))
				return false;
			if (obj == this)
				return true;
			return ((ImmutableObjectAttribute) obj).Immutable == immutable;
		}

		public override int GetHashCode()
		{
			return immutable.GetHashCode ();
		}

		public override bool IsDefaultAttribute()
		{
			return immutable == ImmutableObjectAttribute.Default.Immutable;
		}

	}
}