using System;
using System.Collections.Generic;
using System.Text;

namespace ScrewTurn.Wiki.AclEngine {

	/// <summary>
	/// Contains arguments for the <see cref="IAclManager.AclChanged" /> event.
	/// </summary>
	public class AclChangedEventArgs : EventArgs {

		private AclEntry[] entries;
		private Change change;

		/// <summary>
		/// Initializes a new instance of the <see cref="T:AclChangedEventArgs" /> class.
		/// </summary>
		/// <param name="entries">The entries that changed.</param>
		/// <param name="change">The change.</param>
		/// <exception cref="ArgumentNullException">If <paramref name="entries"/> is <c>null</c>.</exception>
		/// <exception cref="ArgumentException">If <paramref name="entries"/> is empty.</exception>
		public AclChangedEventArgs(AclEntry[] entries, Change change) {
			if(entries == null) throw new ArgumentNullException("entry");
			if(entries.Length == 0) throw new ArgumentException("Entries cannot be empty", "entries");

			this.entries = entries;
			this.change = change;
		}

		/// <summary>
		/// Gets the entries that changed.
		/// </summary>
		public AclEntry[] Entries {
			get { return entries; }
		}

		/// <summary>
		/// Gets the change.
		/// </summary>
		public Change Change {
			get { return change; }
		}

	}

	/// <summary>
	/// Lists legal changes for ACL entries.
	/// </summary>
	public enum Change {
		/// <summary>
		/// An entry is stored.
		/// </summary>
		EntryStored,
		/// <summary>
		/// An entry is deleted.
		/// </summary>
		EntryDeleted
	}

}