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Diffstat (limited to 'Plugins.Essentials/src/Extensions/CollectionsExtensions.cs')
| -rw-r--r-- | Plugins.Essentials/src/Extensions/CollectionsExtensions.cs | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Plugins.Essentials/src/Extensions/CollectionsExtensions.cs b/Plugins.Essentials/src/Extensions/CollectionsExtensions.cs new file mode 100644 index 0000000..9500d5e --- /dev/null +++ b/Plugins.Essentials/src/Extensions/CollectionsExtensions.cs @@ -0,0 +1,85 @@ +/* +* Copyright (c) 2022 Vaughn Nugent +* +* Library: VNLib +* Package: VNLib.Plugins.Essentials +* File: CollectionsExtensions.cs +* +* CollectionsExtensions.cs is part of VNLib.Plugins.Essentials which is part of the larger +* VNLib collection of libraries and utilities. +* +* VNLib.Plugins.Essentials is free software: you can redistribute it and/or modify +* it under the terms of the GNU Affero General Public License as +* published by the Free Software Foundation, either version 3 of the +* License, or (at your option) any later version. +* +* VNLib.Plugins.Essentials is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU Affero General Public License for more details. +* +* You should have received a copy of the GNU Affero General Public License +* along with this program. If not, see https://www.gnu.org/licenses/. +*/ + +using System; +using System.Collections.Generic; +using System.Diagnostics.CodeAnalysis; + +#nullable enable + +namespace VNLib.Plugins.Essentials.Extensions +{ + /// <summary> + /// + /// </summary> + public static class CollectionsExtensions + { + /// <summary> + /// Gets a value by the specified key if it exsits and the value is not null/empty + /// </summary> + /// <param name="dict"></param> + /// <param name="key">Key associated with the value</param> + /// <param name="value">Value associated with the key</param> + /// <returns>True of the key is found and is not noll/empty, false otherwise</returns> + public static bool TryGetNonEmptyValue(this IReadOnlyDictionary<string, string> dict, string key, [MaybeNullWhen(false)] out string value) + { + if (dict.TryGetValue(key, out string? val) && !string.IsNullOrWhiteSpace(val)) + { + value = val; + return true; + } + value = null; + return false; + } + /// <summary> + /// Determines if an argument was set in a <see cref="IReadOnlyDictionary{TKey, TValue}"/> by comparing + /// the value stored at the key, to the type argument + /// </summary> + /// <param name="dict"></param> + /// <param name="key">The argument's key</param> + /// <param name="argument">The argument to compare against</param> + /// <returns> + /// True if the key was found, and the value at the key is equal to the type parameter. False if the key is null/empty, or the + /// value does not match the specified type + /// </returns> + /// <exception cref="ArgumentNullException"></exception> + public static bool IsArgumentSet(this IReadOnlyDictionary<string, string> dict, string key, ReadOnlySpan<char> argument) + { + //Try to get the value from the dict, if the value is null casting it to span (implicitly) should stop null excpetions and return false + return dict.TryGetValue(key, out string? value) && string.GetHashCode(argument) == string.GetHashCode(value); + } + /// <summary> + /// + /// </summary> + /// <typeparam name="TKey"></typeparam> + /// <typeparam name="TValue"></typeparam> + /// <param name="dict"></param> + /// <param name="key"></param> + /// <returns></returns> + public static TValue? GetValueOrDefault<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key) + { + return dict.TryGetValue(key, out TValue? value) ? value : default; + } + } +}
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