AbstractRepository.php

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<?php
namespace Magento\Catalog\Ui\Component\Listing\Attribute;

abstract class AbstractRepository implements RepositoryInterface
{
    protected $attributes;

    protected $searchCriteriaBuilder;

    public function __construct(
        \Magento\Catalog\Api\ProductAttributeRepositoryInterface $productAttributeRepository,
        \Magento\Framework\Api\SearchCriteriaBuilder $searchCriteriaBuilder
    ) {
        $this->productAttributeRepository = $productAttributeRepository;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
    }

    abstract protected function buildSearchCriteria();

    public function getList()
    {
        if (null == $this->attributes) {
            $this->attributes = $this->productAttributeRepository
                ->getList($this->buildSearchCriteria())
                ->getItems();
        }
        return $this->attributes;
    }
}