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