jellyfin/MediaBrowser.Providers/FolderProviderFromXml.cs

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C#
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using MediaBrowser.Common.IO;
using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Providers;
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using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
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using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
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namespace MediaBrowser.Providers
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{
/// <summary>
/// Provides metadata for Folders and all subclasses by parsing folder.xml
/// </summary>
public class FolderProviderFromXml : BaseMetadataProvider
{
private readonly IFileSystem _fileSystem;
public FolderProviderFromXml(ILogManager logManager, IServerConfigurationManager configurationManager, IFileSystem fileSystem)
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: base(logManager, configurationManager)
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{
_fileSystem = fileSystem;
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}
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/// <summary>
/// Supportses the specified item.
/// </summary>
/// <param name="item">The item.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
public override bool Supports(BaseItem item)
{
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return item.IsFolder && item.LocationType == LocationType.FileSystem;
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}
/// <summary>
/// Gets the priority.
/// </summary>
/// <value>The priority.</value>
public override MetadataProviderPriority Priority
{
get { return MetadataProviderPriority.First; }
}
private const string XmlFileName = "folder.xml";
protected override bool NeedsRefreshBasedOnCompareDate(BaseItem item, BaseProviderInfo providerInfo)
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{
var xml = item.ResolveArgs.GetMetaFileByPath(Path.Combine(item.MetaLocation, XmlFileName));
if (xml == null)
{
return false;
}
return _fileSystem.GetLastWriteTimeUtc(xml) > item.DateLastSaved;
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}
/// <summary>
/// Fetches metadata and returns true or false indicating if any work that requires persistence was done
/// </summary>
/// <param name="item">The item.</param>
/// <param name="force">if set to <c>true</c> [force].</param>
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/// <param name="providerInfo">The provider information.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{System.Boolean}.</returns>
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public override async Task<bool> FetchAsync(BaseItem item, bool force, BaseProviderInfo providerInfo, CancellationToken cancellationToken)
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{
cancellationToken.ThrowIfCancellationRequested();
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var metadataFile = item.ResolveArgs.GetMetaFileByPath(Path.Combine(item.MetaLocation, XmlFileName));
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if (metadataFile != null)
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{
var path = metadataFile.FullName;
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await XmlParsingResourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
new BaseItemXmlParser<Folder>(Logger).Fetch((Folder)item, path, cancellationToken);
}
finally
{
XmlParsingResourcePool.Release();
}
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}
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SetLastRefreshed(item, DateTime.UtcNow, providerInfo);
return true;
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}
}
}