100 lines
3.6 KiB
C#
100 lines
3.6 KiB
C#
using MediaBrowser.Common.Extensions;
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using MediaBrowser.Model.Entities;
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Runtime.Serialization;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MediaBrowser.Controller.Entities
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{
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/// <summary>
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/// Specialized Folder class that points to a subset of the physical folders in the system.
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/// It is created from the user-specific folders within the system root
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/// </summary>
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public class CollectionFolder : Folder, ICollectionFolder, IByReferenceItem
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{
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/// <summary>
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/// Gets a value indicating whether this instance is virtual folder.
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/// </summary>
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/// <value><c>true</c> if this instance is virtual folder; otherwise, <c>false</c>.</value>
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[IgnoreDataMember]
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public override bool IsVirtualFolder
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{
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get
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{
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return true;
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}
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}
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/// <summary>
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/// Allow different display preferences for each collection folder
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/// </summary>
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/// <value>The display prefs id.</value>
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protected override Guid DisplayPreferencesId
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{
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get
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{
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return Id;
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}
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}
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// Cache this since it will be used a lot
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/// <summary>
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/// The null task result
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/// </summary>
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private static readonly Task NullTaskResult = Task.FromResult<object>(null);
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/// <summary>
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/// Compare our current children (presumably just read from the repo) with the current state of the file system and adjust for any changes
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/// ***Currently does not contain logic to maintain items that are unavailable in the file system***
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/// </summary>
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/// <param name="progress">The progress.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <param name="recursive">if set to <c>true</c> [recursive].</param>
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/// <returns>Task.</returns>
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protected override Task ValidateChildrenInternal(IProgress<double> progress, CancellationToken cancellationToken, bool? recursive = null)
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{
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//we don't directly validate our children
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//but we do need to clear out the index cache...
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IndexCache = new ConcurrentDictionary<string, List<BaseItem>>(StringComparer.OrdinalIgnoreCase);
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return NullTaskResult;
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}
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/// <summary>
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/// Our children are actually just references to the ones in the physical root...
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/// </summary>
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/// <value>The actual children.</value>
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protected override ConcurrentDictionary<Guid,BaseItem> ActualChildren
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{
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get
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{
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IEnumerable<Guid> folderIds;
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try
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{
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// Accessing ResolveArgs could involve file system access
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folderIds = ResolveArgs.PhysicalLocations.Select(f => (f.GetMBId(typeof(Folder))));
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}
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catch (IOException ex)
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{
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Logger.ErrorException("Error creating FolderIds for {0}", ex, Path);
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folderIds = new Guid[] {};
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}
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var ourChildren =
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LibraryManager.RootFolder.Children.OfType<Folder>()
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.Where(i => folderIds.Contains(i.Id))
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.SelectMany(c => c.Children);
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return new ConcurrentDictionary<Guid,BaseItem>(ourChildren.ToDictionary(i => i.Id));
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}
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}
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}
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}
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