New provider system. Only for people right now

MediaBrowser.Controller/Providers/IMetadataProvider.cs

@@ -0,0 +1,90 @@
+using MediaBrowser.Model.Entities;
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Controller.Providers
+{
+    /// <summary>
+    /// Marker interface
+    /// </summary>
+    public interface IMetadataProvider
+    {
+        /// <summary>
+        /// Gets the name.
+        /// </summary>
+        /// <value>The name.</value>
+        string Name { get; }
+    }
+
+    public interface IMetadataProvider<TItemType> : IMetadataProvider
+           where TItemType : IHasMetadata
+    {
+    }
+    
+    public interface ILocalMetadataProvider : IMetadataProvider
+    {
+        /// <summary>
+        /// Determines whether [has local metadata] [the specified item].
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <returns><c>true</c> if [has local metadata] [the specified item]; otherwise, <c>false</c>.</returns>
+        bool HasLocalMetadata(IHasMetadata item);
+    }
+
+    public interface IRemoteMetadataProvider : IMetadataProvider
+    {
+    }
+
+    public interface IRemoteMetadataProvider<TItemType> : IMetadataProvider<TItemType>, IRemoteMetadataProvider
+        where TItemType : IHasMetadata
+    {
+        Task<MetadataResult<TItemType>> GetMetadata(ItemId id, CancellationToken cancellationToken);
+    }
+
+    public interface ILocalMetadataProvider<TItemType> : IMetadataProvider<TItemType>, ILocalMetadataProvider
+         where TItemType : IHasMetadata
+    {
+        Task<MetadataResult<TItemType>> GetMetadata(string path, CancellationToken cancellationToken);
+    }
+
+    public interface IHasChangeMonitor
+    {
+        /// <summary>
+        /// Determines whether the specified date has changed.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <param name="date">The date.</param>
+        /// <returns><c>true</c> if the specified date has changed; otherwise, <c>false</c>.</returns>
+        bool HasChanged(IHasMetadata item, DateTime date);
+    }
+
+    public enum MetadataProviderType
+    {
+        Embedded = 0,
+        Local = 1,
+        Remote = 2
+    }
+
+    public class MetadataResult<T>
+        where T : IHasMetadata
+    {
+        public bool HasMetadata { get; set; }
+        public T Item { get; set; }
+    }
+
+    public class ItemId : IHasProviderIds
+    {
+        public string Name { get; set; }
+        public string MetadataLanguage { get; set; }
+        public string MetadataCountryCode { get; set; }
+
+        public Dictionary<string, string> ProviderIds { get; set; }
+
+        public ItemId()
+        {
+            ProviderIds = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+        }
+    }
+}