src/Library/Localization.SqlLocalizer/DbStringLocalizer/SqlStringLocalizerFactory.cs

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using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Localization;
using Microsoft.Extensions.Options;

namespace Localization.SqlLocalizer.DbStringLocalizer
{
    public class SqlStringLocalizerFactory : IStringLocalizerFactory, IStringExtendedLocalizerFactory
    {
        private readonly DevelopmentSetup _developmentSetup;
        private readonly LocalizationModelContext _context;
        private static readonly ConcurrentDictionary<string, IStringLocalizer> _resourceLocalizations = new ConcurrentDictionary<string, IStringLocalizer>();
        private readonly IOptions<SqlLocalizationOptions> _options;
        private const string Global = "global";

        public SqlStringLocalizerFactory(
           LocalizationModelContext context,
           DevelopmentSetup developmentSetup,
           IOptions<SqlLocalizationOptions> localizationOptions)
        {
            _options = localizationOptions ?? throw new ArgumentNullException(nameof(localizationOptions));
            _context = context ?? throw new ArgumentNullException(nameof(LocalizationModelContext));
            _developmentSetup = developmentSetup;
        }

        public IStringLocalizer Create(Type resourceSource)
        {
            var returnOnlyKeyIfNotFound = _options.Value.ReturnOnlyKeyIfNotFound;
            var createNewRecordWhenLocalisedStringDoesNotExist = _options.Value.CreateNewRecordWhenLocalisedStringDoesNotExist;
            SqlStringLocalizer sqlStringLocalizer;

            if (_options.Value.UseOnlyPropertyNames)
            {
                if (_resourceLocalizations.Keys.Contains(Global))
                {
                    return _resourceLocalizations[Global];
                }

                sqlStringLocalizer = new SqlStringLocalizer(GetAllFromDatabaseForResource(Global),  _developmentSetup, Global, returnOnlyKeyIfNotFound, createNewRecordWhenLocalisedStringDoesNotExist);
                return _resourceLocalizations.GetOrAdd(Global, sqlStringLocalizer);
                
            }
            else if (_options.Value.UseTypeFullNames)
            {
                if (_resourceLocalizations.Keys.Contains(resourceSource.FullName))
                {
                    return _resourceLocalizations[resourceSource.FullName];
                }

                sqlStringLocalizer = new SqlStringLocalizer(GetAllFromDatabaseForResource(resourceSource.FullName), _developmentSetup, resourceSource.FullName, returnOnlyKeyIfNotFound, createNewRecordWhenLocalisedStringDoesNotExist);
                return _resourceLocalizations.GetOrAdd(resourceSource.FullName, sqlStringLocalizer);
            }

            if (_resourceLocalizations.Keys.Contains(resourceSource.Name))
            {
                return _resourceLocalizations[resourceSource.Name];