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<?php |
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namespace KGzocha\Searcher\Chain; |
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use KGzocha\Searcher\Criteria\Collection\CriteriaCollectionInterface; |
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use KGzocha\Searcher\Result\ResultCollection; |
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use KGzocha\Searcher\SearcherInterface; |
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/** |
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* This class represents whole chain of searchers, but it behaves like regular searcher. |
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* It will perform all (not skipped) sub-searches, transform theirs results into CriteriaCollection |
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* and pass those criteria to next sub-search. |
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* At the end it will return collection of all the results from all the steps. |
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* |
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* @author Krzysztof Gzocha <[email protected]> |
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*/ |
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class ChainSearch implements SearcherInterface |
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{ |
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/** |
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* @var CellInterface[] |
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*/ |
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private $cells; |
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/** |
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* @param CellInterface[] $cells |
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*/ |
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public function __construct(array $cells) |
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{ |
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$this->validateCells($cells); |
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$this->cells = $cells; |
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} |
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/** |
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* Will perform multiple sub-searches. |
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* Results from first search will be transformed and passed as CriteriaCollection |
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* to another sub-search. |
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* Whole process will return collection of results from each sub-search. |
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* |
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* @param CriteriaCollectionInterface $criteriaCollection |
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* |
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* @return ResultCollection |
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*/ |
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public function search( |
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CriteriaCollectionInterface $criteriaCollection |
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) { |
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$previousCriteria = null; |
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$previousResults = null; |
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$resultsArray = []; |
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foreach ($this->cells as $cell) { |
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if ($this->shouldSkipResults($cell->getTransformer(), $previousResults)) { |
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continue; |
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} |
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// Assumed only for first iteration |
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if (!$previousCriteria) { |
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$previousCriteria = $criteriaCollection; |
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} |
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$previousResults = $cell->getSearcher()->search($previousCriteria); |
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if ($cell->hasTransformer()) { |
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$previousCriteria = $cell->getTransformer()->transform($previousResults); |
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} |
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if ($cell->getName()) { |
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$resultsArray[$cell->getName()] = $previousResults; |
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continue; |
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} |
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array_push($resultsArray, $previousResults); |
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} |
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return new ResultCollection($resultsArray); |
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} |
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/** |
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* @param CellInterface[] $cells |
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* @throws \InvalidArgumentException |
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*/ |
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private function validateCells(array $cells) |
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{ |
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if (2 > count($cells)) { |
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throw new \InvalidArgumentException( |
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'At least two searchers are required to create a chain' |
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); |
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} |
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foreach ($cells as $cell) { |
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if (is_object($cell) && $cell instanceof CellInterface) { |
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continue; |
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} |
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throw new \InvalidArgumentException(sprintf( |
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'All cells passed to %s should be object and must implement CellInterface', |
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__CLASS__ |
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)); |
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} |
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} |
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/** |
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* @param TransformerInterface $transformer |
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* @param mixed $results |
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* |
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* @return bool |
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*/ |
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private function shouldSkipResults( |
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TransformerInterface $transformer, |
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$results |
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) { |
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return null !== $results && $transformer->skip($results); |
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} |
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} |
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krzysztof-gzocha /
searcher
