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
{
///
/// The BaseXmlProvider.
///
/// Type of provider.
public abstract class BaseXmlProvider : ILocalMetadataProvider, IHasItemChangeMonitor, IHasOrder
where T : BaseItem, new()
{
///
/// Initializes a new instance of the class.
///
/// Instance of the interface.
protected BaseXmlProvider(IFileSystem fileSystem)
{
this.FileSystem = fileSystem;
}
///
public string Name => XmlProviderUtils.Name;
/// After Nfo
///
public virtual int Order => 1;
///
/// Gets the IFileSystem.
///
protected IFileSystem FileSystem { get; }
///
/// Gets metadata for item.
///
/// The item info.
/// Instance of the interface.
/// The cancellation token.
/// The metadata for item.
public Task> GetMetadata(
ItemInfo info,
IDirectoryService directoryService,
CancellationToken cancellationToken)
{
var result = new MetadataResult();
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);
}
///
/// Get metadata from path.
///
/// Resulting metadata.
/// The path.
/// The cancellation token.
protected abstract void Fetch(MetadataResult result, string path, CancellationToken cancellationToken);
///
/// Get metadata from xml file.
///
/// Item inf.
/// Instance of the interface.
/// The file system metadata.
protected abstract FileSystemMetadata? GetXmlFile(ItemInfo info, IDirectoryService directoryService);
///
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;
}
}
}