CreditmemoRepository.php

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<?php
namespace Magento\Sales\Model\Order;

use Magento\Framework\Api\SearchCriteria\CollectionProcessorInterface;
use Magento\Framework\Exception\CouldNotDeleteException;
use Magento\Framework\Exception\CouldNotSaveException;
use Magento\Framework\Exception\InputException;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Sales\Api\Data\CreditmemoSearchResultInterfaceFactory as SearchResultFactory;
use Magento\Sales\Model\ResourceModel\Metadata;

class CreditmemoRepository implements \Magento\Sales\Api\CreditmemoRepositoryInterface
{
    protected $metadata;

    protected $searchResultFactory = null;

    protected $registry = [];

    private $collectionProcessor;

    public function __construct(
        Metadata $metadata,
        SearchResultFactory $searchResultFactory,
        CollectionProcessorInterface $collectionProcessor = null
    ) {
        $this->metadata = $metadata;
        $this->searchResultFactory = $searchResultFactory;
        $this->collectionProcessor = $collectionProcessor ?: $this->getCollectionProcessor();
    }

    public function get($id)
    {
        if (!$id) {
            throw new InputException(__('An ID is needed. Set the ID and try again.'));
        }
        if (!isset($this->registry[$id])) {
            $entity = $this->metadata->getNewInstance()->load($id);
            if (!$entity->getEntityId()) {
                throw new NoSuchEntityException(
                    __("The entity that was requested doesn't exist. Verify the entity and try again.")
                );
            }
            $this->registry[$id] = $entity;
        }
        return $this->registry[$id];
    }

    public function create()
    {
        return $this->metadata->getNewInstance();
    }

    public function getList(\Magento\Framework\Api\SearchCriteriaInterface $searchCriteria)
    {
        $searchResult = $this->searchResultFactory->create();
        $this->collectionProcessor->process($searchCriteria, $searchResult);
        $searchResult->setSearchCriteria($searchCriteria);
        return $searchResult;
    }

    public function delete(\Magento\Sales\Api\Data\CreditmemoInterface $entity)
    {
        try {
            $this->metadata->getMapper()->delete($entity);
            unset($this->registry[$entity->getEntityId()]);
        } catch (\Exception $e) {
            throw new CouldNotDeleteException(__("The credit memo couldn't be deleted."), $e);
        }
        return true;
    }

    public function save(\Magento\Sales\Api\Data\CreditmemoInterface $entity)
    {
        try {
            $this->metadata->getMapper()->save($entity);
            $this->registry[$entity->getEntityId()] = $entity;
        } catch (LocalizedException $e) {
            throw new CouldNotSaveException(__($e->getMessage()), $e);
        } catch (\Exception $e) {
            throw new CouldNotSaveException(__("The credit memo couldn't be saved."), $e);
        }
        return $this->registry[$entity->getEntityId()];
    }

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