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<?php |
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/** |
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* File was created 06.05.2015 22:56 |
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* |
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* @author Karsten J. Gerber <[email protected]> |
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*/ |
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namespace PeekAndPoke\Component\Psi; |
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/** |
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* @api |
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* |
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* @author Karsten J. Gerber <[email protected]> |
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*/ |
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class DefaultOperationChainSolver implements OperationChainSolver |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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public function solve(\Iterator $operations, \Iterator $items) |
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{ |
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// search for all UnaryOperations |
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$tempResult = $items; |
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$unaryChain = new \ArrayIterator(); |
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foreach ($operations as $operation) { |
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// collect all unary operators |
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if ($operation instanceof IntermediateOperation) { |
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$unaryChain->append($operation); |
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} else { |
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// execute all the collected unary operations |
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if ($unaryChain->count() > 0) { |
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$tempResult = $this->solveIntermediateOperationChain($unaryChain, $tempResult); |
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$unaryChain = new \ArrayIterator(); |
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} |
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// execute full set operations (like sort) |
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if ($operation instanceof FullSetOperation) { |
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$tempResult = $operation->apply($tempResult); |
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} |
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} |
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} |
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// resolve the rest of the unary operation |
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if ($unaryChain->count() > 0) { |
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$tempResult = $this->solveIntermediateOperationChain($unaryChain, $tempResult); |
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} |
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return $tempResult; |
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} |
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/** |
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* @param \Iterator $operatorChain |
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* @param \Iterator $input |
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* |
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* @return \ArrayIterator |
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*/ |
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private function solveIntermediateOperationChain(\Iterator $operatorChain, \Iterator $input) |
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{ |
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$results = new \ArrayIterator(); |
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$input->rewind(); |
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$continueWithNextItem = true; |
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while ($continueWithNextItem && $input->valid()) { |
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$result = $input->current(); |
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$useResult = true; |
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// do the whole intermediate operation chain for the current input |
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$operatorChain->rewind(); |
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while ($useResult && $operatorChain->valid()) { |
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/** @var IntermediateOperation $current */ |
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$current = $operatorChain->current(); |
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// apply intermediate operations |
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$result = $current->apply($result, $input->key(), $useResult, $returnedCanContinue); |
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// track the continuation flags |
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$continueWithNextItem = $continueWithNextItem && $returnedCanContinue; |
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// iterate |
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$operatorChain->next(); |
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} |
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if ($useResult) { |
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$results->offsetSet($input->key(), $result); |
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} |
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// goto next item |
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$input->next(); |
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} |
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return $results; |
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} |
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} |
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PeekAndPoke /
psi
