Umbraco-CMS/src/Umbraco.Core/Events/DeleteEventArgs.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace Umbraco.Core.Events
{
    [SupersedeEvent(typeof(SaveEventArgs<>))]
    [SupersedeEvent(typeof(PublishEventArgs<>))]
    [SupersedeEvent(typeof(MoveEventArgs<>))]
    [SupersedeEvent(typeof(CopyEventArgs<>))]
    public class DeleteEventArgs<TEntity> : CancellableEnumerableObjectEventArgs<TEntity>, IEquatable<DeleteEventArgs<TEntity>>, IDeletingMediaFilesEventArgs
    {
        /// <summary>
        /// Constructor accepting multiple entities that are used in the delete operation
        /// </summary>
        /// <param name="eventObject"></param>
        /// <param name="canCancel"></param>
        /// <param name="eventMessages"></param>
        public DeleteEventArgs(IEnumerable<TEntity> eventObject, bool canCancel, EventMessages eventMessages) : base(eventObject, canCancel, eventMessages)
        {
            MediaFilesToDelete = new List<string>();
        }

        /// <summary>
        /// Constructor accepting multiple entities that are used in the delete operation
        /// </summary>
        /// <param name="eventObject"></param>
        /// <param name="eventMessages"></param>
        public DeleteEventArgs(IEnumerable<TEntity> eventObject, EventMessages eventMessages) : base(eventObject, eventMessages)
        {
            MediaFilesToDelete = new List<string>();
        }

        /// <summary>
        /// Constructor accepting a single entity instance
        /// </summary>
        /// <param name="eventObject"></param>
        /// <param name="eventMessages"></param>
        public DeleteEventArgs(TEntity eventObject, EventMessages eventMessages)
            : base(new List<TEntity> { eventObject }, eventMessages)
        {
            MediaFilesToDelete = new List<string>();
        }

        /// <summary>
        /// Constructor accepting a single entity instance
        /// </summary>
        /// <param name="eventObject"></param>
        /// <param name="canCancel"></param>
        /// <param name="eventMessages"></param>
        public DeleteEventArgs(TEntity eventObject, bool canCancel, EventMessages eventMessages)
            : base(new List<TEntity> { eventObject }, canCancel, eventMessages)
        {
            MediaFilesToDelete = new List<string>();
        }

        /// <summary>
        /// Constructor accepting multiple entities that are used in the delete operation
        /// </summary>
        /// <param name="eventObject"></param>
        /// <param name="canCancel"></param>
        public DeleteEventArgs(IEnumerable<TEntity> eventObject, bool canCancel) : base(eventObject, canCancel)
        {
            MediaFilesToDelete = new List<string>();
        }

        /// <summary>
        /// Constructor accepting multiple entities that are used in the delete operation
        /// </summary>
        /// <param name="eventObject"></param>
        public DeleteEventArgs(IEnumerable<TEntity> eventObject) : base(eventObject)
        {
            MediaFilesToDelete = new List<string>();
        }

        /// <summary>
        /// Constructor accepting a single entity instance
        /// </summary>
        /// <param name="eventObject"></param>
        public DeleteEventArgs(TEntity eventObject)
            : base(new List<TEntity> { eventObject })
        {
            MediaFilesToDelete = new List<string>();
        }

        /// <summary>
        /// Constructor accepting a single entity instance
        /// </summary>
        /// <param name="eventObject"></param>
        /// <param name="canCancel"></param>
        public DeleteEventArgs(TEntity eventObject, bool canCancel)
            : base(new List<TEntity> { eventObject }, canCancel)
        {
            MediaFilesToDelete = new List<string>();
        }

        /// <summary>
        /// Returns all entities that were deleted during the operation
        /// </summary>
        public IEnumerable<TEntity> DeletedEntities
        {
            get { return EventObject; }
            internal set { EventObject = value; } // fixme ouch!
        }

        /// <summary>
        /// A list of media files that can be added to during a deleted operation for which Umbraco will ensure are removed
        /// </summary>
        public List<string> MediaFilesToDelete { get; private set; }

        public bool Equals(DeleteEventArgs<TEntity> other)
        {
            if (ReferenceEquals(null, other)) return false;
            if (ReferenceEquals(this, other)) return true;
            return base.Equals(other) && MediaFilesToDelete.SequenceEqual(other.MediaFilesToDelete);
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((DeleteEventArgs<TEntity>) obj);
        }

        public override int GetHashCode()
        {
            unchecked
            {
                return (base.GetHashCode() * 397) ^ MediaFilesToDelete.GetHashCode();
            }
        }

        public static bool operator ==(DeleteEventArgs<TEntity> left, DeleteEventArgs<TEntity> right)
        {
            return Equals(left, right);
        }

        public static bool operator !=(DeleteEventArgs<TEntity> left, DeleteEventArgs<TEntity> right)
        {
            return !Equals(left, right);
        }
    }

    public class DeleteEventArgs : CancellableEventArgs, IEquatable<DeleteEventArgs>
    {
        public DeleteEventArgs(int id, bool canCancel, EventMessages eventMessages)
            : base(canCancel, eventMessages)
        {
            Id = id;
        }

        public DeleteEventArgs(int id, bool canCancel)
            : base(canCancel)
        {
            Id = id;
        }

        public DeleteEventArgs(int id)
        {
            Id = id;
        }

        /// <summary>
        /// Gets the Id of the object being deleted.
        /// </summary>
        public int Id { get; private set; }

        public bool Equals(DeleteEventArgs other)
        {
            if (ReferenceEquals(null, other)) return false;
            if (ReferenceEquals(this, other)) return true;
            return base.Equals(other) && Id == other.Id;
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            if (obj.GetType() != this.GetType()) return false;
            return Equals((DeleteEventArgs) obj);
        }

        public override int GetHashCode()
        {
            unchecked
            {
                return (base.GetHashCode() * 397) ^ Id;
            }
        }

        public static bool operator ==(DeleteEventArgs left, DeleteEventArgs right)
        {
            return Equals(left, right);
        }

        public static bool operator !=(DeleteEventArgs left, DeleteEventArgs right)
        {
            return !Equals(left, right);
        }
    }
}