GroupAttribute.cs

using System;
using Ultz.Extensions.Commands.Built;

namespace Ultz.Extensions.Commands.Attributes.Modules
{
    /// <summary>
    /// Marks the class as a group <see cref="Module" /> with the given aliases.
    /// </summary>
    [AttributeUsage(AttributeTargets.Class)]
    public sealed class GroupAttribute : Attribute
    {
        /// <summary>
        /// Initialises a new <see cref="GroupAttribute" /> with the specified <paramref name="aliases" />.
        /// </summary>
        /// <param name="aliases"> The aliases to set. </param>
        /// <exception cref="ArgumentNullException">
        /// Group aliases must not be null."
        /// </exception>
        /// <exception cref="ArgumentException">
        /// You must provide at least one alias for the group.
        /// </exception>
        public GroupAttribute(params string[] aliases)
        {
            if (aliases == null)
            {
                throw new ArgumentNullException(nameof(aliases), "Group aliases must not be null.");
            }

            if (aliases.Length == 0)
            {
                throw new ArgumentException("You must provide at least one alias for the group.", nameof(aliases));
            }

            Aliases = aliases;
        }

        /// <summary>
        /// Gets the aliases.
        /// </summary>
        public string[] Aliases { get; }
    }
}