State.php

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<?php
namespace Magento\Catalog\Model\Layer;

use Magento\Catalog\Model\Layer\Filter\Item;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\DataObject;

class State extends DataObject
{
    public function addFilter($filter)
    {
        $filters = $this->getFilters();
        $filters[] = $filter;
        $this->setFilters($filters);
        return $this;
    }

    public function setFilters($filters)
    {
        if (!is_array($filters)) {
            throw new LocalizedException(__('The filters are invalid. Set them in an array and try again.'));
        }
        $this->setData('filters', $filters);
        return $this;
    }

    public function getFilters()
    {
        $filters = $this->getData('filters');
        if ($filters === null) {
            $filters = [];
            $this->setData('filters', $filters);
        }
        return $filters;
    }
}