jellyfin/MediaBrowser.Api/UserLibrary/BaseItemsByNameService.cs

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using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Model.Dto;
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using MediaBrowser.Model.Querying;
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using ServiceStack.ServiceHost;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
namespace MediaBrowser.Api.UserLibrary
{
/// <summary>
/// Class BaseItemsByNameService
/// </summary>
/// <typeparam name="TItemType">The type of the T item type.</typeparam>
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public abstract class BaseItemsByNameService<TItemType> : BaseApiService
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where TItemType : BaseItem
{
/// <summary>
/// The _user manager
/// </summary>
protected readonly IUserManager UserManager;
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/// <summary>
/// The library manager
/// </summary>
protected readonly ILibraryManager LibraryManager;
protected readonly IUserDataRepository UserDataRepository;
/// <summary>
/// Initializes a new instance of the <see cref="BaseItemsByNameService{TItemType}" /> class.
/// </summary>
/// <param name="userManager">The user manager.</param>
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/// <param name="libraryManager">The library manager.</param>
/// <param name="userDataRepository">The user data repository.</param>
protected BaseItemsByNameService(IUserManager userManager, ILibraryManager libraryManager, IUserDataRepository userDataRepository)
{
UserManager = userManager;
LibraryManager = libraryManager;
UserDataRepository = userDataRepository;
}
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/// <summary>
/// Gets the specified request.
/// </summary>
/// <param name="request">The request.</param>
/// <returns>Task{ItemsResult}.</returns>
protected async Task<ItemsResult> GetResult(GetItemsByName request)
{
var user = UserManager.GetUserById(request.UserId);
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var item = string.IsNullOrEmpty(request.ParentId) ? user.RootFolder : DtoBuilder.GetItemByClientId(request.ParentId, UserManager, LibraryManager, user.Id);
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IEnumerable<BaseItem> items;
if (item.IsFolder)
{
var folder = (Folder)item;
items = request.Recursive ? folder.GetRecursiveChildren(user) : folder.GetChildren(user);
}
else
{
items = new[] { item };
}
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items = FilterItems(request, items, user);
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var extractedItems = GetAllItems(request, items, user);
extractedItems = FilterItems(request, extractedItems, user);
extractedItems = SortItems(request, extractedItems);
var ibnItemsArray = extractedItems.ToArray();
IEnumerable<IbnStub<TItemType>> ibnItems = ibnItemsArray;
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var result = new ItemsResult
{
TotalRecordCount = ibnItemsArray.Length
};
if (request.StartIndex.HasValue || request.Limit.HasValue)
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{
if (request.StartIndex.HasValue)
{
ibnItems = ibnItems.Skip(request.StartIndex.Value);
}
if (request.Limit.HasValue)
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{
ibnItems = ibnItems.Take(request.Limit.Value);
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}
}
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var fields = request.GetItemFields().ToList();
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var tasks = ibnItems.Select(i => GetDto(i, user, fields));
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var resultItems = await Task.WhenAll(tasks).ConfigureAwait(false);
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result.Items = resultItems.Where(i => i != null).ToArray();
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return result;
}
/// <summary>
/// Filters the items.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="items">The items.</param>
/// <param name="user">The user.</param>
/// <returns>IEnumerable{IbnStub}.</returns>
private IEnumerable<IbnStub<TItemType>> FilterItems(GetItemsByName request, IEnumerable<IbnStub<TItemType>> items, User user)
{
var filters = request.GetFilters().ToList();
if (filters.Count == 0)
{
return items;
}
items = items.AsParallel();
if (filters.Contains(ItemFilter.Dislikes))
{
items = items.Where(i =>
{
var userdata = i.GetUserItemData(UserDataRepository, user.Id).Result;
return userdata != null && userdata.Likes.HasValue && !userdata.Likes.Value;
});
}
if (filters.Contains(ItemFilter.Likes))
{
items = items.Where(i =>
{
var userdata = i.GetUserItemData(UserDataRepository, user.Id).Result;
return userdata != null && userdata.Likes.HasValue && userdata.Likes.Value;
});
}
if (filters.Contains(ItemFilter.IsFavorite))
{
items = items.Where(i =>
{
var userdata = i.GetUserItemData(UserDataRepository, user.Id).Result;
return userdata != null && userdata.Likes.HasValue && userdata.IsFavorite;
});
}
return items.AsEnumerable();
}
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/// <summary>
/// Sorts the items.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="items">The items.</param>
/// <returns>IEnumerable{BaseItem}.</returns>
private IEnumerable<IbnStub<TItemType>> SortItems(GetItemsByName request, IEnumerable<IbnStub<TItemType>> items)
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{
if (string.Equals(request.SortBy, "SortName", StringComparison.OrdinalIgnoreCase))
{
if (request.SortOrder.HasValue && request.SortOrder.Value == Model.Entities.SortOrder.Descending)
{
items = items.OrderByDescending(i => i.Name);
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}
else
{
items = items.OrderBy(i => i.Name);
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}
}
return items;
}
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/// <summary>
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/// Filters the items.
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/// </summary>
/// <param name="request">The request.</param>
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/// <param name="items">The items.</param>
/// <param name="user">The user.</param>
/// <returns>IEnumerable{BaseItem}.</returns>
private IEnumerable<BaseItem> FilterItems(GetItemsByName request, IEnumerable<BaseItem> items, User user)
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{
// Exclude item types
if (!string.IsNullOrEmpty(request.ExcludeItemTypes))
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{
var vals = request.ExcludeItemTypes.Split(',');
items = items.Where(f => !vals.Contains(f.GetType().Name, StringComparer.OrdinalIgnoreCase));
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}
// Include item types
if (!string.IsNullOrEmpty(request.IncludeItemTypes))
{
var vals = request.IncludeItemTypes.Split(',');
items = items.Where(f => vals.Contains(f.GetType().Name, StringComparer.OrdinalIgnoreCase));
}
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return items;
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}
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/// <summary>
/// Gets all items.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="items">The items.</param>
/// <param name="user">The user.</param>
/// <returns>IEnumerable{Tuple{System.StringFunc{System.Int32}}}.</returns>
protected abstract IEnumerable<IbnStub<TItemType>> GetAllItems(GetItemsByName request, IEnumerable<BaseItem> items, User user);
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/// <summary>
/// Gets the dto.
/// </summary>
/// <param name="stub">The stub.</param>
/// <param name="user">The user.</param>
/// <param name="fields">The fields.</param>
/// <returns>Task{DtoBaseItem}.</returns>
private async Task<BaseItemDto> GetDto(IbnStub<TItemType> stub, User user, List<ItemFields> fields)
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{
BaseItem item;
try
{
item = await stub.GetItem().ConfigureAwait(false);
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}
catch (IOException ex)
{
Logger.ErrorException("Error getting IBN item {0}", ex, stub.Name);
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return null;
}
var dto = await new DtoBuilder(Logger, LibraryManager, UserDataRepository).GetBaseItemDto(item, user, fields).ConfigureAwait(false);
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if (fields.Contains(ItemFields.ItemCounts))
{
var items = stub.Items;
dto.ChildCount = items.Count;
dto.RecentlyAddedItemCount = items.Count(i => i.IsRecentlyAdded(user));
}
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return dto;
}
}
/// <summary>
/// Class GetItemsByName
/// </summary>
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public class GetItemsByName : BaseItemsRequest, IReturn<ItemsResult>
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{
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/// <summary>
/// What to sort the results by
/// </summary>
/// <value>The sort by.</value>
[ApiMember(Name = "SortBy", Description = "Optional. Options: SortName", IsRequired = false, DataType = "string", ParameterType = "query", Verb = "GET", AllowMultiple = true)]
public string SortBy { get; set; }
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}
public class IbnStub<T>
where T : BaseItem
{
private readonly Func<IEnumerable<BaseItem>> _childItemsFunction;
private List<BaseItem> _childItems;
private readonly Func<string,Task<T>> _itemFunction;
private Task<T> _itemTask;
public string Name;
public BaseItem Item;
private Task<UserItemData> _userData;
public List<BaseItem> Items
{
get { return _childItems ?? (_childItems = _childItemsFunction().ToList()); }
}
public Task<T> GetItem()
{
return _itemTask ?? (_itemTask = _itemFunction(Name));
}
public async Task<UserItemData> GetUserItemData(IUserDataRepository repo, Guid userId)
{
var item = await GetItem().ConfigureAwait(false);
if (_userData == null)
{
_userData = repo.GetUserData(userId, item.GetUserDataKey());
}
return await _userData.ConfigureAwait(false);
}
public IbnStub(string name, Func<IEnumerable<BaseItem>> childItems, Func<string,Task<T>> item)
{
Name = name;
_childItemsFunction = childItems;
_itemFunction = item;
}
}
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}