| | | 1 | | // Copyright (c) Microsoft Corporation. All rights reserved. |
| | | 2 | | // Licensed under the MIT License. |
| | | 3 | | |
| | | 4 | | #nullable disable |
| | | 5 | | |
| | | 6 | | using System.Collections.Generic; |
| | | 7 | | using System.Linq; |
| | | 8 | | |
| | | 9 | | namespace Azure.Core |
| | | 10 | | { |
| | | 11 | | internal static class Optional |
| | | 12 | | { |
| | | 13 | | public static bool IsCollectionDefined<T>(IEnumerable<T> collection) |
| | | 14 | | { |
| | | 15 | | return !(collection is ChangeTrackingList<T> changeTrackingList && changeTrackingList.IsUndefined); |
| | | 16 | | } |
| | | 17 | | |
| | | 18 | | public static bool IsCollectionDefined<TKey, TValue>(IReadOnlyDictionary<TKey, TValue> collection) |
| | | 19 | | { |
| | | 20 | | return !(collection is ChangeTrackingDictionary<TKey, TValue> changeTrackingList && changeTrackingList.IsUnd |
| | | 21 | | } |
| | | 22 | | |
| | | 23 | | public static bool IsCollectionDefined<TKey, TValue>(IDictionary<TKey, TValue> collection) |
| | | 24 | | { |
| | | 25 | | return !(collection is ChangeTrackingDictionary<TKey, TValue> changeTrackingList && changeTrackingList.IsUnd |
| | | 26 | | } |
| | | 27 | | |
| | | 28 | | public static bool IsDefined<T>(T? value) where T: struct |
| | | 29 | | { |
| | | 30 | | return value.HasValue; |
| | | 31 | | } |
| | | 32 | | public static bool IsDefined(object value) |
| | | 33 | | { |
| | | 34 | | return value != null; |
| | | 35 | | } |
| | | 36 | | public static bool IsDefined(string value) |
| | | 37 | | { |
| | | 38 | | return value != null; |
| | | 39 | | } |
| | | 40 | | |
| | | 41 | | public static IReadOnlyDictionary<TKey, TValue> ToDictionary<TKey, TValue>(Optional<IReadOnlyDictionary<TKey, TV |
| | | 42 | | { |
| | | 43 | | if (optional.HasValue) |
| | | 44 | | { |
| | | 45 | | return optional.Value; |
| | | 46 | | } |
| | | 47 | | return new ChangeTrackingDictionary<TKey, TValue>(optional); |
| | | 48 | | } |
| | | 49 | | |
| | | 50 | | public static IDictionary<TKey, TValue> ToDictionary<TKey, TValue>(Optional<IDictionary<TKey, TValue>> optional) |
| | | 51 | | { |
| | | 52 | | if (optional.HasValue) |
| | | 53 | | { |
| | | 54 | | return optional.Value; |
| | | 55 | | } |
| | | 56 | | return new ChangeTrackingDictionary<TKey, TValue>(optional); |
| | | 57 | | } |
| | | 58 | | public static IReadOnlyList<T> ToList<T>(Optional<IReadOnlyList<T>> optional) |
| | | 59 | | { |
| | | 60 | | if (optional.HasValue) |
| | | 61 | | { |
| | | 62 | | return optional.Value; |
| | | 63 | | } |
| | | 64 | | return new ChangeTrackingList<T>(optional); |
| | | 65 | | } |
| | | 66 | | |
| | | 67 | | public static IList<T> ToList<T>(Optional<IList<T>> optional) |
| | | 68 | | { |
| | | 69 | | if (optional.HasValue) |
| | | 70 | | { |
| | | 71 | | return optional.Value; |
| | | 72 | | } |
| | | 73 | | return new ChangeTrackingList<T>(optional); |
| | | 74 | | } |
| | | 75 | | |
| | | 76 | | public static T? ToNullable<T>(Optional<T> optional) where T: struct |
| | | 77 | | { |
| | | 78 | | if (optional.HasValue) |
| | | 79 | | { |
| | | 80 | | return optional.Value; |
| | | 81 | | } |
| | | 82 | | return default; |
| | | 83 | | } |
| | | 84 | | |
| | | 85 | | public static T? ToNullable<T>(Optional<T?> optional) where T: struct |
| | | 86 | | { |
| | | 87 | | return optional.Value; |
| | | 88 | | } |
| | | 89 | | } |
| | | 90 | | |
| | | 91 | | internal readonly partial struct Optional<T> |
| | | 92 | | { |
| | 0 | 93 | | public Optional(T value) : this() |
| | | 94 | | { |
| | 0 | 95 | | Value = value; |
| | 0 | 96 | | HasValue = true; |
| | 0 | 97 | | } |
| | | 98 | | |
| | 0 | 99 | | public T Value { get; } |
| | 0 | 100 | | public bool HasValue { get; } |
| | | 101 | | |
| | 0 | 102 | | public static implicit operator Optional<T>(T value) => new Optional<T>(value); |
| | 0 | 103 | | public static implicit operator T(Optional<T> optional) => optional.Value; |
| | | 104 | | } |
| | | 105 | | } |