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109 lines
3.5 KiB
C#
109 lines
3.5 KiB
C#
using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Providers;
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using MediaBrowser.Model.IO;
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namespace MediaBrowser.LocalMetadata
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{
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/// <summary>
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/// The BaseXmlProvider.
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/// </summary>
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/// <typeparam name="T">Type of provider.</typeparam>
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public abstract class BaseXmlProvider<T> : ILocalMetadataProvider<T>, IHasItemChangeMonitor, IHasOrder
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where T : BaseItem, new()
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="BaseXmlProvider{T}"/> class.
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/// </summary>
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/// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
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protected BaseXmlProvider(IFileSystem fileSystem)
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{
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this.FileSystem = fileSystem;
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}
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/// <inheritdoc />
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public string Name => XmlProviderUtils.Name;
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/// After Nfo
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/// <inheritdoc />
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public virtual int Order => 1;
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/// <summary>
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/// Gets the IFileSystem.
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/// </summary>
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protected IFileSystem FileSystem { get; }
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/// <summary>
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/// Gets metadata for item.
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/// </summary>
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/// <param name="info">The item info.</param>
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/// <param name="directoryService">Instance of the <see cref="IDirectoryService"/> interface.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>The metadata for item.</returns>
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public Task<MetadataResult<T>> GetMetadata(
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ItemInfo info,
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IDirectoryService directoryService,
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CancellationToken cancellationToken)
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{
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var result = new MetadataResult<T>();
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var file = GetXmlFile(info, directoryService);
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if (file == null)
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{
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return Task.FromResult(result);
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}
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var path = file.FullName;
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try
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{
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result.Item = new T();
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Fetch(result, path, cancellationToken);
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result.HasMetadata = true;
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}
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catch (FileNotFoundException)
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{
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result.HasMetadata = false;
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}
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catch (IOException)
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{
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result.HasMetadata = false;
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}
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return Task.FromResult(result);
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}
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/// <summary>
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/// Get metadata from path.
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/// </summary>
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/// <param name="result">Resulting metadata.</param>
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/// <param name="path">The path.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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protected abstract void Fetch(MetadataResult<T> result, string path, CancellationToken cancellationToken);
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/// <summary>
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/// Get metadata from xml file.
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/// </summary>
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/// <param name="info">Item inf.</param>
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/// <param name="directoryService">Instance of the <see cref="IDirectoryService"/> interface.</param>
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/// <returns>The file system metadata.</returns>
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protected abstract FileSystemMetadata GetXmlFile(ItemInfo info, IDirectoryService directoryService);
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/// <inheritdoc />
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public bool HasChanged(BaseItem item, IDirectoryService directoryService)
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{
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var file = GetXmlFile(new ItemInfo(item), directoryService);
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if (file == null)
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{
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return false;
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}
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return file.Exists && FileSystem.GetLastWriteTimeUtc(file) > item.DateLastSaved;
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}
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}
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}
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