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/*
* 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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