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<?php |
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namespace Smart\EtlBundle\Extractor; |
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use Smart\EtlBundle\Exception\Extractor\EntityAlreadyRegisteredException; |
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use Smart\EtlBundle\Exception\Extractor\EntityIdentifiedNotFoundException; |
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use Smart\EtlBundle\Exception\Extractor\EntityIdentifierAlreadyProcessedException; |
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use Smart\EtlBundle\Exception\Extractor\EntityTypeNotHandledException; |
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use Symfony\Component\PropertyAccess\PropertyAccess; |
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/** |
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* Nicolas Bastien <[email protected]> |
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*/ |
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trait EntityExtractorTrait |
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{ |
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/** |
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* List of entities to extract |
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* [ |
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* 'entity_code' => 'Model Classname' |
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* ] |
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* @var array |
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*/ |
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protected $entitiesToProcess = []; |
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/** |
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* @var array |
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*/ |
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protected $entities = []; |
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/** |
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* @var PropertyAccessor |
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*/ |
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protected $accessor; |
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/** |
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* @param string $entityType |
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* @param string$entityClass |
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* @param function $identifierCallback |
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* @return $this |
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* @throws \Exception |
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*/ |
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public function addEntityToProcess($entityType, $entityClass, $identifierCallback) |
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{ |
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if (isset($this->entitiesToProcess[$entityType])) { |
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throw new EntityAlreadyRegisteredException($entityType); |
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} |
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$this->entitiesToProcess[$entityType] = [ |
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'type' => $entityType, |
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'class' => $entityClass, |
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'callback' => $identifierCallback |
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]; |
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return $this; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function extract() |
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{ |
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try { |
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$this->init(); |
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$this->check(); |
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$files = $this->getFiles($this->getFileExtension()); |
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foreach ($this->entitiesToProcess as $entityType => $data) { |
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if (!isset($files[$entityType])) { |
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continue; |
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} |
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$this->processFile($entityType); |
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} |
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return $this->entities; |
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} catch (\Exception $e) { |
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throw $e; |
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} |
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} |
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protected function check() |
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{ |
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parent::check(); |
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if (count($this->entitiesToProcess) === 0) { |
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throw new \BadMethodCallException('Nothing to process'); |
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} |
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} |
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protected function init() |
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{ |
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$this->accessor = PropertyAccess::createPropertyAccessor(); |
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} |
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/** |
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* @param string $entityType |
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* @param array $data |
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* @return mixed |
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* @throws \Exception |
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*/ |
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protected function processObject($entityType, array $data) |
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{ |
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if (!isset($this->entitiesToProcess[$entityType])) { |
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throw new EntityTypeNotHandledException($entityType); |
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} |
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$data = $this->transformData($data); |
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if ($data === null) { |
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return null; |
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} |
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$objectClass = $this->entitiesToProcess[$entityType]['class']; |
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$object = new $objectClass(); |
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foreach ($data as $key => $value) { |
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$valueToSet = $value; |
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if (is_string($value) && strpos($value, '@') === 0) { |
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//handle relations |
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$valueToSet = $this->getEntity($value); |
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} |
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$this->accessor->setValue($object, $key, $valueToSet); |
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} |
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return $object; |
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} |
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/** |
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* @param string $identifier |
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* @return mixed |
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* @throws \Exception |
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*/ |
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protected function getEntity($identifier) |
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{ |
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if (strpos($identifier, '@') === 0) { |
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$identifier = substr($identifier, 1); |
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} |
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if (!isset($this->entities[$identifier])) { |
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throw new EntityIdentifiedNotFoundException($identifier); |
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} |
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return $this->entities[$identifier]; |
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} |
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/** |
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* @param string $filename |
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* @throws \Exception |
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*/ |
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protected function processFile($filename) |
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{ |
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$filepath = sprintf('%s/%s.' . $this->getFileExtension(), $this->folderToExtract, $filename); |
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$data = $this->extractFileContent($filepath); |
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foreach ($data as $values) { |
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if ($values === null) { |
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continue; |
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} |
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$object = $this->processObject($filename, $values); |
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if ($object !== null) { |
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$entityIdentifier = $this->entitiesToProcess[$filename]['callback']($object); |
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if (isset($this->entities[$entityIdentifier])) { |
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throw new EntityIdentifierAlreadyProcessedException($entityIdentifier); |
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} |
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$this->entities[$entityIdentifier] = $object; |
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} |
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} |
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} |
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} |
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.