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1<?php
2namespace Apie\IanaValueObjects;
3
4use Apie\Core\Lists\StringSet;
5
6trait HasActiveFilter
7{
8    abstract protected static function getActiveData(): array;
9    private static StringSet $activeOptions;
10
11    protected static function requiresActive(): bool
12    {
13        return true;
14    }
15
16    public static function getOptions(): StringSet
17    {
18        if (!isset(static::$activeOptions)) {
19            static::$activeOptions = new StringSet(array_keys(static::getActiveData()));
20        }
21        return static::$activeOptions;
22    }
23}