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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json.Serialization;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.IO;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.IO;
namespace MediaBrowser.Controller.Entities
{
/// <summary>
/// Specialized folder that can have items added to it's children by external entities.
/// Used for our RootFolder so plug-ins can add items.
/// </summary>
public class AggregateFolder : Folder
{
public AggregateFolder()
{
PhysicalLocationsList = Array.Empty<string>();
}
[JsonIgnore]
public override bool IsPhysicalRoot => true;
public override bool CanDelete()
{
return false;
}
[JsonIgnore]
public override bool SupportsPlayedStatus => false;
/// <summary>
/// The _virtual children
/// </summary>
private readonly ConcurrentBag<BaseItem> _virtualChildren = new ConcurrentBag<BaseItem>();
/// <summary>
/// Gets the virtual children.
/// </summary>
/// <value>The virtual children.</value>
public ConcurrentBag<BaseItem> VirtualChildren => _virtualChildren;
[JsonIgnore]
public override string[] PhysicalLocations => PhysicalLocationsList;
public string[] PhysicalLocationsList { get; set; }
protected override FileSystemMetadata[] GetFileSystemChildren(IDirectoryService directoryService)
{
return CreateResolveArgs(directoryService, true).FileSystemChildren;
}
private Guid[] _childrenIds = null;
private readonly object _childIdsLock = new object();
protected override List<BaseItem> LoadChildren()
{
lock (_childIdsLock)
{
if (_childrenIds == null || _childrenIds.Length == 0)
{
var list = base.LoadChildren();
_childrenIds = list.Select(i => i.Id).ToArray();
return list;
}
return _childrenIds.Select(LibraryManager.GetItemById).Where(i => i != null).ToList();
}
}
private void ClearCache()
{
lock (_childIdsLock)
{
_childrenIds = null;
}
}
private bool _requiresRefresh;
public override bool RequiresRefresh()
{
var changed = base.RequiresRefresh() || _requiresRefresh;
if (!changed)
{
var locations = PhysicalLocations;
var newLocations = CreateResolveArgs(new DirectoryService(Logger, FileSystem), false).PhysicalLocations;
if (!locations.SequenceEqual(newLocations))
{
changed = true;
}
}
return changed;
}
public override bool BeforeMetadataRefresh(bool replaceAllMetdata)
{
ClearCache();
var changed = base.BeforeMetadataRefresh(replaceAllMetdata) || _requiresRefresh;
_requiresRefresh = false;
return changed;
}
private ItemResolveArgs CreateResolveArgs(IDirectoryService directoryService, bool setPhysicalLocations)
{
ClearCache();
var path = ContainingFolderPath;
var args = new ItemResolveArgs(ConfigurationManager.ApplicationPaths, directoryService)
{
FileInfo = FileSystem.GetDirectoryInfo(path),
Path = path
};
// Gather child folder and files
if (args.IsDirectory)
{
// When resolving the root, we need it's grandchildren (children of user views)
var flattenFolderDepth = 2;
var files = FileData.GetFilteredFileSystemEntries(directoryService, args.Path, FileSystem, CollectionFolder.ApplicationHost, Logger, args, flattenFolderDepth: flattenFolderDepth, resolveShortcuts: true);
// Need to remove subpaths that may have been resolved from shortcuts
// Example: if \\server\movies exists, then strip out \\server\movies\action
files = LibraryManager.NormalizeRootPathList(files).ToArray();
args.FileSystemChildren = files;
}
_requiresRefresh = _requiresRefresh || !args.PhysicalLocations.SequenceEqual(PhysicalLocations);
if (setPhysicalLocations)
{
PhysicalLocationsList = args.PhysicalLocations;
}
return args;
}
protected override IEnumerable<BaseItem> GetNonCachedChildren(IDirectoryService directoryService)
{
return base.GetNonCachedChildren(directoryService).Concat(_virtualChildren);
}
protected override async Task ValidateChildrenInternal(IProgress<double> progress, CancellationToken cancellationToken, bool recursive, bool refreshChildMetadata, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService)
{
ClearCache();
await base.ValidateChildrenInternal(progress, cancellationToken, recursive, refreshChildMetadata, refreshOptions, directoryService)
.ConfigureAwait(false);
ClearCache();
}
/// <summary>
/// Adds the virtual child.
/// </summary>
/// <param name="child">The child.</param>
/// <exception cref="ArgumentNullException"></exception>
public void AddVirtualChild(BaseItem child)
{
if (child == null)
{
throw new ArgumentNullException(nameof(child));
}
_virtualChildren.Add(child);
}
/// <summary>
/// Finds the virtual child.
/// </summary>
/// <param name="id">The id.</param>
/// <returns>BaseItem.</returns>
/// <exception cref="ArgumentNullException">id</exception>
public BaseItem FindVirtualChild(Guid id)
{
if (id.Equals(Guid.Empty))
{
throw new ArgumentNullException(nameof(id));
}
foreach (var child in _virtualChildren)
{
if (child.Id == id)
{
return child;
}
}
return null;
}
}
}
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