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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Utils
* File: CollectionExtensions.cs
*
* CollectionExtensions.cs is part of VNLib.Utils which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Utils is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 2 of the License,
* or (at your option) any later version.
*
* VNLib.Utils 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with VNLib.Utils. If not, see http://www.gnu.org/licenses/.
*/
using System;
using System.Collections.Generic;
using VNLib.Utils.Memory;
namespace VNLib.Utils.Extensions
{
/// <summary>
/// Provides collection extension methods
/// </summary>
public static class CollectionExtensions
{
/// <summary>
/// Gets a previously-stored base32 encoded value-type from the lookup and returns its initialized structure from
/// the value stored
/// </summary>
/// <typeparam name="TKey">The key type used to index the lookup</typeparam>
/// <typeparam name="TValue">An unmanaged structure type</typeparam>
/// <param name="lookup"></param>
/// <param name="key">The key used to identify the value</param>
/// <returns>The initialized structure, or default if the lookup returns null/empty string</returns>
public static TValue GetValueType<TKey, TValue>(this IIndexable<TKey, string> lookup, TKey key) where TValue : unmanaged where TKey : notnull
{
//Get value
string value = lookup[key];
//If the string is set, recover the value and return it
return string.IsNullOrWhiteSpace(value) ? default : VnEncoding.FromBase32String<TValue>(value);
}
/// <summary>
/// Serializes a value-type in base32 encoding and stores it at the specified key
/// </summary>
/// <typeparam name="TKey">The key type used to index the lookup</typeparam>
/// <typeparam name="TValue">An unmanaged structure type</typeparam>
/// <param name="lookup"></param>
/// <param name="key">The key used to identify the value</param>
/// <param name="value">The value to serialze</param>
public static void SetValueType<TKey, TValue>(this IIndexable<TKey, string> lookup, TKey key, TValue value) where TValue : unmanaged where TKey : notnull
{
//encode string from value type and store in lookup
lookup[key] = VnEncoding.ToBase32String(value);
}
/// <summary>
/// Executes a handler delegate on every element of the list within a try-catch block
/// and rethrows exceptions as an <see cref="AggregateException"/>
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <param name="handler">An <see cref="Action"/> handler delegate to complete some operation on the elements within the list</param>
/// <exception cref="AggregateException"></exception>
public static void TryForeach<T>(this IEnumerable<T> list, Action<T> handler)
{
List<Exception>? exceptionList = null;
foreach(T item in list)
{
try
{
handler(item);
}
catch(Exception ex)
{
//Init new list and add the exception
exceptionList ??= new();
exceptionList.Add(ex);
}
}
//Raise aggregate exception for all caught exceptions
if(exceptionList?.Count > 0)
{
throw new AggregateException(exceptionList);
}
}
}
}
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