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<?php |
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/** |
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* This file is part of Hydrogen package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace RDS\Hydrogen\Processor; |
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use Doctrine\Common\Persistence\ObjectRepository; |
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use Doctrine\ORM\EntityManagerInterface; |
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use Doctrine\ORM\EntityRepository; |
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use RDS\Hydrogen\Criteria\Common\Field; |
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use RDS\Hydrogen\Criteria\CriterionInterface; |
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use RDS\Hydrogen\Query; |
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/** |
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* Class Processor |
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*/ |
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abstract class Processor implements ProcessorInterface |
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{ |
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/** |
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* @var string[]|BuilderInterface[] |
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*/ |
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protected const CRITERIA_MAPPINGS = []; |
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/** |
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* @var ObjectRepository|EntityRepository |
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*/ |
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protected $repository; |
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/** |
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* @var EntityManagerInterface |
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*/ |
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protected $em; |
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/** |
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* @var array|BuilderInterface[] |
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*/ |
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private $builderInstances = []; |
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/** |
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* DatabaseProcessor constructor. |
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* @param ObjectRepository $repository |
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* @param EntityManagerInterface $em |
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*/ |
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public function __construct(ObjectRepository $repository, EntityManagerInterface $em) |
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{ |
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$this->em = $em; |
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$this->repository = $repository; |
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\assert(\count(static::CRITERIA_MAPPINGS)); |
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} |
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/** |
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* @param CriterionInterface $criterion |
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* @return BuilderInterface |
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*/ |
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protected function getBuilder(CriterionInterface $criterion): BuilderInterface |
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{ |
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$key = \get_class($criterion); |
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if (isset($this->builderInstances[$key])) { |
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return $this->builderInstances[$key]; |
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} |
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$processor = static::CRITERIA_MAPPINGS[\get_class($criterion)] ?? null; |
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if ($processor === null) { |
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$error = \vsprintf('%s processor does not support the "%s" criterion', [ |
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\str_replace_last('Processor', '', \class_basename($this)), |
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\class_basename($criterion), |
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]); |
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throw new \InvalidArgumentException($error); |
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} |
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return $this->builderInstances[$key] = new $processor($this); |
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} |
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/** |
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* @param mixed $context |
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* @param Query $query |
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* @return \Generator |
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*/ |
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protected function forEach($context, Query $query): \Generator |
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{ |
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foreach ($query->getCriteria() as $criterion) { |
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$builder = $this->getBuilder($criterion); |
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yield from $builder->apply($context, $criterion); |
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} |
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} |
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/** |
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* @param \Generator $generator |
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* @param Query $query |
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* @param \Closure $each |
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* @return \Generator |
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*/ |
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protected function bypass(\Generator $generator, Query $query, \Closure $each): \Generator |
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{ |
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$this->builderInstances = []; |
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while ($generator->valid()) { |
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[$key, $value] = [$generator->key(), $generator->current()]; |
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yield from $result = $this->yieldThrough($key, $value, $query, $each); |
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$response = $result->getReturn(); |
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\assert($response !== null); |
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$generator->send($response); |
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} |
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} |
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/** |
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* @param mixed $key |
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* @param mixed $value |
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* @param Query $query |
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* @param \Closure $each |
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* @return \Generator |
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*/ |
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private function yieldThrough($key, $value, Query $query, \Closure $each): \Generator |
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{ |
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switch (true) { |
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case $value instanceof Field: |
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return $this->applyField($query, $value); |
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break; |
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case $key instanceof Field: |
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yield from $co = $this->applyFieldWithValue($query, $key, $value); |
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return $co->getReturn(); |
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break; |
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case $value instanceof \Closure: |
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yield $value; |
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return $value; |
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case $value instanceof Query: |
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$query->merge($value); |
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return $query; |
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default: |
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return $each($value, $key); |
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} |
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} |
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/** |
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* @param Query $query |
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* @param Field $field |
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* @return string |
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*/ |
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private function applyField(Query $query, Field $field): string |
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{ |
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return $field->withQuery($query)->toString(); |
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} |
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/** |
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* @param Query $query |
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* @param Field $field |
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* @param $value |
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* @return \Generator |
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* @throws \Exception |
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*/ |
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private function applyFieldWithValue(Query $query, Field $field, $value): \Generator |
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{ |
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$placeholder = $query->placeholder($field->getName()); |
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yield $placeholder => $value; |
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return $placeholder; |
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} |
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} |
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This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.