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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Entities.Audio;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Querying;
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using MediaBrowser.Model.Search;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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namespace MediaBrowser.Server.Implementations.Library
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{
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/// <summary>
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/// Class LuceneSearchEngine
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/// http://www.codeproject.com/Articles/320219/Lucene-Net-ultra-fast-search-for-MVC-or-WebForms
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/// </summary>
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public class SearchEngine : ISearchEngine
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{
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private readonly ILibraryManager _libraryManager;
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private readonly IUserManager _userManager;
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private readonly ILogger _logger;
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public SearchEngine(ILogManager logManager, ILibraryManager libraryManager, IUserManager userManager)
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{
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_libraryManager = libraryManager;
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_userManager = userManager;
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_logger = logManager.GetLogger("Lucene");
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}
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public async Task<QueryResult<SearchHintInfo>> GetSearchHints(SearchQuery query)
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{
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var user = _userManager.GetUserById(new Guid(query.UserId));
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var inputItems = user.RootFolder.GetRecursiveChildren(user, null);
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var results = await GetSearchHints(inputItems, query).ConfigureAwait(false);
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var searchResultArray = results.ToArray();
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results = searchResultArray;
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var count = searchResultArray.Length;
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if (query.StartIndex.HasValue)
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{
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results = results.Skip(query.StartIndex.Value);
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}
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if (query.Limit.HasValue)
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{
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results = results.Take(query.Limit.Value);
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}
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return new QueryResult<SearchHintInfo>
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{
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TotalRecordCount = count,
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Items = results.ToArray()
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};
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}
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/// <summary>
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/// Gets the search hints.
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/// </summary>
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/// <param name="inputItems">The input items.</param>
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/// <param name="query">The query.</param>
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/// <returns>IEnumerable{SearchHintResult}.</returns>
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/// <exception cref="System.ArgumentNullException">searchTerm</exception>
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private Task<IEnumerable<SearchHintInfo>> GetSearchHints(IEnumerable<BaseItem> inputItems, SearchQuery query)
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{
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var searchTerm = query.SearchTerm;
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if (string.IsNullOrEmpty(searchTerm))
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{
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throw new ArgumentNullException("searchTerm");
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}
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var terms = GetWords(searchTerm);
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var hints = new List<Tuple<BaseItem, string, int>>();
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var items = inputItems.Where(i => !(i is MusicArtist)).ToList();
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if (query.IncludeMedia)
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{
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// Add search hints based on item name
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hints.AddRange(items.Where(i => !string.IsNullOrEmpty(i.Name)).Select(item =>
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{
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var index = GetIndex(item.Name, searchTerm, terms);
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return new Tuple<BaseItem, string, int>(item, index.Item1, index.Item2);
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}));
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}
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if (query.IncludeArtists)
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{
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// Find artists
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var artists = _libraryManager.GetAllArtists(items)
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.ToList();
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foreach (var item in artists)
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{
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var index = GetIndex(item, searchTerm, terms);
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if (index.Item2 != -1)
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{
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try
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{
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var artist = _libraryManager.GetArtist(item);
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hints.Add(new Tuple<BaseItem, string, int>(artist, index.Item1, index.Item2));
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error getting {0}", ex, item);
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}
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}
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}
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}
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if (query.IncludeGenres)
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{
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// Find genres, from non-audio items
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var genres = items.Where(i => !(i is IHasMusicGenres) && !(i is Game))
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.SelectMany(i => i.Genres)
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.Where(i => !string.IsNullOrEmpty(i))
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.Distinct(StringComparer.OrdinalIgnoreCase)
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.ToList();
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foreach (var item in genres)
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{
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var index = GetIndex(item, searchTerm, terms);
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if (index.Item2 != -1)
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{
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try
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{
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var genre = _libraryManager.GetGenre(item);
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hints.Add(new Tuple<BaseItem, string, int>(genre, index.Item1, index.Item2));
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error getting {0}", ex, item);
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}
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}
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}
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// Find music genres
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var musicGenres = items.Where(i => i is IHasMusicGenres)
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.SelectMany(i => i.Genres)
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.Where(i => !string.IsNullOrEmpty(i))
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.Distinct(StringComparer.OrdinalIgnoreCase)
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.ToList();
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foreach (var item in musicGenres)
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{
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var index = GetIndex(item, searchTerm, terms);
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if (index.Item2 != -1)
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{
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try
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{
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var genre = _libraryManager.GetMusicGenre(item);
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hints.Add(new Tuple<BaseItem, string, int>(genre, index.Item1, index.Item2));
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error getting {0}", ex, item);
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}
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}
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}
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// Find music genres
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var gameGenres = items.OfType<Game>()
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.SelectMany(i => i.Genres)
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.Where(i => !string.IsNullOrEmpty(i))
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.Distinct(StringComparer.OrdinalIgnoreCase)
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.ToList();
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foreach (var item in gameGenres)
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{
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var index = GetIndex(item, searchTerm, terms);
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if (index.Item2 != -1)
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{
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try
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{
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var genre = _libraryManager.GetGameGenre(item);
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hints.Add(new Tuple<BaseItem, string, int>(genre, index.Item1, index.Item2));
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error getting {0}", ex, item);
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}
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}
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}
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}
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if (query.IncludeStudios)
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{
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// Find studios
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var studios = items.SelectMany(i => i.Studios)
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.Where(i => !string.IsNullOrEmpty(i))
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.Distinct(StringComparer.OrdinalIgnoreCase)
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.ToList();
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foreach (var item in studios)
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{
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var index = GetIndex(item, searchTerm, terms);
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if (index.Item2 != -1)
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{
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try
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{
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var studio = _libraryManager.GetStudio(item);
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hints.Add(new Tuple<BaseItem, string, int>(studio, index.Item1, index.Item2));
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error getting {0}", ex, item);
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}
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}
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}
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}
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if (query.IncludePeople)
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{
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// Find persons
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var persons = items.SelectMany(i => i.People)
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.Select(i => i.Name)
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.Where(i => !string.IsNullOrEmpty(i))
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.Distinct(StringComparer.OrdinalIgnoreCase)
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.ToList();
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foreach (var item in persons)
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{
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var index = GetIndex(item, searchTerm, terms);
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if (index.Item2 != -1)
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{
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try
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{
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var person = _libraryManager.GetPerson(item);
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hints.Add(new Tuple<BaseItem, string, int>(person, index.Item1, index.Item2));
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error getting {0}", ex, item);
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}
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}
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}
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}
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var returnValue = hints.Where(i => i.Item3 >= 0).OrderBy(i => i.Item3).Select(i => new SearchHintInfo
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{
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Item = i.Item1,
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MatchedTerm = i.Item2
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});
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return Task.FromResult(returnValue);
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}
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/// <summary>
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/// Gets the index.
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/// </summary>
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/// <param name="input">The input.</param>
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/// <param name="searchInput">The search input.</param>
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/// <param name="searchWords">The search input.</param>
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/// <returns>System.Int32.</returns>
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private Tuple<string, int> GetIndex(string input, string searchInput, List<string> searchWords)
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{
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if (string.IsNullOrEmpty(input))
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{
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throw new ArgumentNullException("input");
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}
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if (string.Equals(input, searchInput, StringComparison.OrdinalIgnoreCase))
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{
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return new Tuple<string, int>(searchInput, 0);
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}
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var index = input.IndexOf(searchInput, StringComparison.OrdinalIgnoreCase);
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if (index == 0)
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{
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return new Tuple<string, int>(searchInput, 1);
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}
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if (index > 0)
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{
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return new Tuple<string, int>(searchInput, 2);
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}
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var items = GetWords(input);
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for (var i = 0; i < searchWords.Count; i++)
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{
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var searchTerm = searchWords[i];
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for (var j = 0; j < items.Count; j++)
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{
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var item = items[j];
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if (string.Equals(item, searchTerm, StringComparison.OrdinalIgnoreCase))
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{
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return new Tuple<string, int>(searchTerm, 3 + (i + 1) * (j + 1));
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}
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index = item.IndexOf(searchTerm, StringComparison.OrdinalIgnoreCase);
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if (index == 0)
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{
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return new Tuple<string, int>(searchTerm, 4 + (i + 1) * (j + 1));
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}
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if (index > 0)
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{
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return new Tuple<string, int>(searchTerm, 5 + (i + 1) * (j + 1));
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}
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}
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}
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return new Tuple<string, int>(null, -1);
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}
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/// <summary>
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/// Gets the words.
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/// </summary>
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/// <param name="term">The term.</param>
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/// <returns>System.String[][].</returns>
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private List<string> GetWords(string term)
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{
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return term.Split().Where(i => !string.IsNullOrWhiteSpace(i)).ToList();
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}
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}
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}
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Luke Pulverenti
11 years ago