base.php

См. документацию.

<?php
 
namespace Bitrix\Location\Repository\Location\Strategy;
 
use Bitrix\Location\Repository\Location\IRepository;
use Bitrix\Main\ArgumentOutOfRangeException;

abstract class Base
{
    protected $locationRepositories = [];
 
    const REPO_PRIORITY_A = 'A';
    const REPO_PRIORITY_B = 'B';
    const REPO_PRIORITY_C = 'C';

    public function __construct(array $locationRepositories = [])
    {
        $this->setLocationRepositories($locationRepositories);
    }

    public function setLocationRepositories(array $locationRepositories): Base
    {
        foreach($locationRepositories as $repository)
        {
            if(!($repository instanceof IRepository))
            {
                throw new ArgumentOutOfRangeException('locationRepositories');
            }
 
            $this->locationRepositories[] = $repository;
        }
 
        return $this;
    }
}