jellyfin/Jellyfin.Data/Entities/Libraries/CollectionItem.cs
2020-11-18 13:46:14 +00:00

95 lines
2.8 KiB
C#

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using Jellyfin.Data.Interfaces;
namespace Jellyfin.Data.Entities.Libraries
{
/// <summary>
/// An entity representing a collection item.
/// </summary>
public class CollectionItem : IHasConcurrencyToken
{
/// <summary>
/// Initializes a new instance of the <see cref="CollectionItem"/> class.
/// </summary>
/// <param name="collection">The collection.</param>
/// <param name="previous">The previous item.</param>
/// <param name="next">The next item.</param>
public CollectionItem(Collection collection, CollectionItem previous, CollectionItem next)
{
if (collection == null)
{
throw new ArgumentNullException(nameof(collection));
}
collection.Items.Add(this);
if (next != null)
{
Next = next;
next.Previous = this;
}
if (previous != null)
{
Previous = previous;
previous.Next = this;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="CollectionItem"/> class.
/// </summary>
/// <remarks>
/// Default constructor. Protected due to required properties, but present because EF needs it.
/// </remarks>
protected CollectionItem()
{
}
/// <summary>
/// Gets or sets the id.
/// </summary>
/// <remarks>
/// Identity, Indexed, Required.
/// </remarks>
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
/// <inheritdoc />
[ConcurrencyCheck]
public uint RowVersion { get; set; }
/// <summary>
/// Gets or sets the library item.
/// </summary>
/// <remarks>
/// Required.
/// </remarks>
public virtual LibraryItem LibraryItem { get; set; }
/// <summary>
/// Gets or sets the next item in the collection.
/// </summary>
/// <remarks>
/// TODO check if this properly updated Dependant and has the proper principal relationship.
/// </remarks>
public virtual CollectionItem Next { get; set; }
/// <summary>
/// Gets or sets the previous item in the collection.
/// </summary>
/// <remarks>
/// TODO check if this properly updated Dependant and has the proper principal relationship.
/// </remarks>
public virtual CollectionItem Previous { get; set; }
/// <inheritdoc />
public void OnSavingChanges()
{
RowVersion++;
}
}
}