namespace DigitalData.Core.Attributes
{
    /// <summary>
    /// Provides helper methods for working with attributes.
    /// </summary>
    public static class AttrHelper
    {
        /// <summary>
        /// Retrieves the <see cref="ADFilterAttribute"/> applied to a given type.
        /// </summary>
        /// <typeparam name="T">The type to examine for the attribute.</typeparam>
        /// <returns>The <see cref="ADFilterAttribute"/> found on the type; null if the attribute is not present.</returns>
        public static ADFilterAttribute? GetFilterAttrOf<T>()
        {
            // Get the ADFilterAttribute from the type, if it exists
            Attribute? attr = Attribute.GetCustomAttribute(typeof(T), typeof(ADFilterAttribute));

            // Check if the attribute is of the expected type and return it; otherwise, return null
            if (attr is ADFilterAttribute fAttr)
                return fAttr;

            return null;
        }
    }
}