| | | 1 | | using System; |
| | | 2 | | using System.Collections.Generic; |
| | | 3 | | |
| | | 4 | | namespace Jellyfin.Extensions |
| | | 5 | | { |
| | | 6 | | /// <summary> |
| | | 7 | | /// Static extensions for the <see cref="IReadOnlyList{T}"/> interface. |
| | | 8 | | /// </summary> |
| | | 9 | | public static class ReadOnlyListExtension |
| | | 10 | | { |
| | | 11 | | /// <summary> |
| | | 12 | | /// Finds the index of the desired item. |
| | | 13 | | /// </summary> |
| | | 14 | | /// <param name="source">The source list.</param> |
| | | 15 | | /// <param name="value">The value to fine.</param> |
| | | 16 | | /// <typeparam name="T">The type of item to find.</typeparam> |
| | | 17 | | /// <returns>Index if found, else -1.</returns> |
| | | 18 | | public static int IndexOf<T>(this IReadOnlyList<T> source, T value) |
| | | 19 | | { |
| | 8 | 20 | | if (source is IList<T> list) |
| | | 21 | | { |
| | 8 | 22 | | return list.IndexOf(value); |
| | | 23 | | } |
| | | 24 | | |
| | 0 | 25 | | for (int i = 0; i < source.Count; i++) |
| | | 26 | | { |
| | 0 | 27 | | if (Equals(value, source[i])) |
| | | 28 | | { |
| | 0 | 29 | | return i; |
| | | 30 | | } |
| | | 31 | | } |
| | | 32 | | |
| | 0 | 33 | | return -1; |
| | | 34 | | } |
| | | 35 | | |
| | | 36 | | /// <summary> |
| | | 37 | | /// Finds the index of the predicate. |
| | | 38 | | /// </summary> |
| | | 39 | | /// <param name="source">The source list.</param> |
| | | 40 | | /// <param name="match">The value to find.</param> |
| | | 41 | | /// <typeparam name="T">The type of item to find.</typeparam> |
| | | 42 | | /// <returns>Index if found, else -1.</returns> |
| | | 43 | | public static int FindIndex<T>(this IReadOnlyList<T> source, Predicate<T> match) |
| | | 44 | | { |
| | 22 | 45 | | if (source is List<T> list) |
| | | 46 | | { |
| | 0 | 47 | | return list.FindIndex(match); |
| | | 48 | | } |
| | | 49 | | |
| | 76 | 50 | | for (int i = 0; i < source.Count; i++) |
| | | 51 | | { |
| | 27 | 52 | | if (match(source[i])) |
| | | 53 | | { |
| | 11 | 54 | | return i; |
| | | 55 | | } |
| | | 56 | | } |
| | | 57 | | |
| | 11 | 58 | | return -1; |
| | | 59 | | } |
| | | 60 | | |
| | | 61 | | /// <summary> |
| | | 62 | | /// Get the first or default item from a list. |
| | | 63 | | /// </summary> |
| | | 64 | | /// <param name="source">The source list.</param> |
| | | 65 | | /// <typeparam name="T">The type of item.</typeparam> |
| | | 66 | | /// <returns>The first item or default if list is empty.</returns> |
| | | 67 | | public static T? FirstOrDefault<T>(this IReadOnlyList<T>? source) |
| | | 68 | | { |
| | 228 | 69 | | if (source is null || source.Count == 0) |
| | | 70 | | { |
| | 45 | 71 | | return default; |
| | | 72 | | } |
| | | 73 | | |
| | 183 | 74 | | return source[0]; |
| | | 75 | | } |
| | | 76 | | } |
| | | 77 | | } |