// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

namespace System.Web.WebPages
{
    internal class DisposableAction : IDisposable
    {
        private Action _action;
        private bool _hasDisposed;

        public DisposableAction(Action action)
        {
            if (action == null)
            {
                throw new ArgumentNullException("action");
            }
            _action = action;
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            // If we were disposed by the finalizer it's because the user didn't use a "using" block, so don't do anything!
            if (disposing)
            {
                lock (this)
                {
                    if (!_hasDisposed)
                    {
                        _hasDisposed = true;
                        _action();
                    }
                }
            }
        }
    }
}
