VariablesDataProvider.php

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<?php
namespace Magento\Variable\Ui\Component;

use Magento\Framework\Api\FilterBuilder;
use Magento\Framework\Api\Search\ReportingInterface;
use Magento\Framework\Api\Search\SearchCriteriaBuilder;
use Magento\Framework\Api\SortOrder;
use Magento\Framework\App\RequestInterface;

class VariablesDataProvider extends \Magento\Framework\View\Element\UiComponent\DataProvider\DataProvider
{
    private $variableDataProvider;

    public function __construct(
        $name,
        $primaryFieldName,
        $requestFieldName,
        ReportingInterface $reporting,
        SearchCriteriaBuilder $searchCriteriaBuilder,
        RequestInterface $request,
        FilterBuilder $filterBuilder,
        \Magento\Variable\Model\Variable\Data $variableDataProvider,
        array $meta = [],
        array $data = []
    ) {
        parent::__construct(
            $name,
            $primaryFieldName,
            $requestFieldName,
            $reporting,
            $searchCriteriaBuilder,
            $request,
            $filterBuilder,
            $meta,
            $data
        );
        $this->variableDataProvider = $variableDataProvider;
    }

    private function sortBy($items, $field, $direction)
    {
        usort($items, function ($item1, $item2) use ($field, $direction) {
            return $this->variablesCompare($item1, $item2, $field, $direction);
        });
        return $items;
    }

    private function variablesCompare($variable1, $variable2, $partIndex, $direction)
    {
        $values = [$variable1[$partIndex], $variable2[$partIndex]];
        sort($values, SORT_STRING);
        return $variable1[$partIndex] === $values[$direction == SortOrder::SORT_ASC ? 0 : 1] ? -1 : 1;
    }

    public function getData()
    {
        $searchCriteria = $this->getSearchCriteria();
        $sortOrders = $searchCriteria->getSortOrders();

        $items = array_merge(
            $this->variableDataProvider->getDefaultVariables(),
            $this->variableDataProvider->getCustomVariables()
        );

        foreach ($sortOrders as $sortOrder) {
            if ($sortOrder->getField() && $sortOrder->getDirection()) {
                $items = $this->sortBy($items, $sortOrder->getField(), $sortOrder->getDirection());
            }
        }

        foreach ($searchCriteria->getFilterGroups() as $filterGroup) {
            foreach ($filterGroup->getFilters() as $filter) {
                $value = str_replace('%', '', $filter->getValue());
                $filterField = $filter->getField();
                $items = array_values(array_filter($items, function ($item) use ($value, $filterField) {
                    return strpos(strtolower($item[$filterField]), strtolower($value)) !== false;
                }));
            }
        }

        return [
            'items' => $items
        ];
    }
}