AppliersPool.php

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<?php
namespace Magento\Braintree\Model\Report\ConditionAppliers;

class AppliersPool
{
    private $appliersPool = [];

    public function __construct(array $appliers)
    {
        $this->appliersPool = $appliers;
        $this->checkAppliers();
    }

    private function checkAppliers()
    {
        foreach ($this->appliersPool as $applier) {
            if (!($applier instanceof ApplierInterface)) {
                throw new \InvalidArgumentException('Report filter applier must implement ApplierInterface');
            }
        }
        return true;
    }

    public function getApplier($filter)
    {
        if (is_object($filter)) {
            $filterClass = get_class($filter);
            if (array_key_exists($filterClass, $this->appliersPool)) {
                return $this->appliersPool[$filterClass];
            }
        }
        return null;
    }
}