RuleRepository.php

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<?php
namespace Magento\SalesRule\Model;

use Magento\Framework\Api\Search\FilterGroup;
use Magento\Framework\Api\SearchCriteria\CollectionProcessorInterface;
use Magento\Framework\Api\SearchCriteriaInterface;
use Magento\Framework\Api\SortOrder;
use Magento\SalesRule\Model\ResourceModel\Rule\Collection;

class RuleRepository implements \Magento\SalesRule\Api\RuleRepositoryInterface
{
    protected $ruleFactory;

    protected $ruleDataFactory;

    protected $conditionDataFactory;

    protected $toDataModelConverter;

    protected $toModelConverter;

    protected $dataObjectProcessor;

    protected $searchResultFactory;

    protected $extensionAttributesJoinProcessor;

    protected $ruleCollectionFactory;

    private $collectionProcessor;

    public function __construct(
        \Magento\SalesRule\Model\RuleFactory $ruleFactory,
        \Magento\SalesRule\Api\Data\RuleInterfaceFactory $ruleDataFactory,
        \Magento\SalesRule\Api\Data\ConditionInterfaceFactory $conditionDataFactory,
        \Magento\SalesRule\Model\Converter\ToDataModel $toDataModelConverter,
        \Magento\SalesRule\Model\Converter\ToModel $toModelConverter,
        \Magento\SalesRule\Api\Data\RuleSearchResultInterfaceFactory $searchResultFactory,
        \Magento\Framework\Api\ExtensionAttribute\JoinProcessorInterface $extensionAttributesJoinProcessor,
        \Magento\SalesRule\Model\ResourceModel\Rule\CollectionFactory $ruleCollectionFactory,
        \Magento\Framework\Reflection\DataObjectProcessor $dataObjectProcessor,
        CollectionProcessorInterface $collectionProcessor = null
    ) {
        $this->ruleFactory = $ruleFactory;
        $this->ruleDataFactory = $ruleDataFactory;
        $this->conditionDataFactory = $conditionDataFactory;
        $this->toDataModelConverter = $toDataModelConverter;
        $this->toModelConverter = $toModelConverter;
        $this->searchResultFactory = $searchResultFactory;
        $this->extensionAttributesJoinProcessor = $extensionAttributesJoinProcessor;
        $this->ruleCollectionFactory = $ruleCollectionFactory;
        $this->dataObjectProcessor = $dataObjectProcessor;
        $this->collectionProcessor = $collectionProcessor ?: $this->getCollectionProcessor();
    }

    public function save(\Magento\SalesRule\Api\Data\RuleInterface $rule)
    {
        $model = $this->toModelConverter->toModel($rule);
        $model->save();
        $model->load($model->getId());
        $model->getStoreLabels();
        return $this->toDataModelConverter->toDataModel($model);
    }

    public function getById($id)
    {
        $model = $this->ruleFactory->create()
            ->load($id);

        if (!$model->getId()) {
            throw new \Magento\Framework\Exception\NoSuchEntityException();
        }

        $model->getStoreLabels();
        $dataModel = $this->toDataModelConverter->toDataModel($model);
        return $dataModel;
    }

    public function getList(SearchCriteriaInterface $searchCriteria)
    {
        $collection = $this->ruleCollectionFactory->create();
        $ruleInterfaceName = \Magento\SalesRule\Api\Data\RuleInterface::class;
        $this->extensionAttributesJoinProcessor->process($collection, $ruleInterfaceName);

        $this->collectionProcessor->process($searchCriteria, $collection);
        $rules = [];
        foreach ($collection->getItems() as $ruleModel) {
            $ruleModel->load($ruleModel->getId());
            $ruleModel->getStoreLabels();
            $rules[] = $this->toDataModelConverter->toDataModel($ruleModel);
        }

        $searchResults = $this->searchResultFactory->create();
        $searchResults->setSearchCriteria($searchCriteria);
        $searchResults->setItems($rules);
        $searchResults->setTotalCount($collection->getSize());
        return $searchResults;
    }

    public function deleteById($id)
    {
        $model = $this->ruleFactory->create()->load($id);

        if (!$model->getId()) {
            throw new \Magento\Framework\Exception\NoSuchEntityException();
        }
        $model->delete();
        return true;
    }

    protected function addFilterGroupToCollection(
        \Magento\Framework\Api\Search\FilterGroup $filterGroup,
        Collection $collection
    ) {
        $fields = [];
        $conditions = [];
        foreach ($filterGroup->getFilters() as $filter) {
            $condition = $filter->getConditionType() ? $filter->getConditionType() : 'eq';
            $fields[] = $filter->getField();
            $conditions[] = [$condition => $filter->getValue()];
        }
        if ($fields) {
            $collection->addFieldToFilter($fields, $conditions);
        }
    }

    private function getCollectionProcessor()
    {
        if (!$this->collectionProcessor) {
            $this->collectionProcessor = \Magento\Framework\App\ObjectManager::getInstance()->get(
                \Magento\Framework\Api\SearchCriteria\CollectionProcessorInterface::class
            );
        }
        return $this->collectionProcessor;
    }
}