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<?php |
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/** |
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* File was created 11.05.2015 07:05 |
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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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use PeekAndPoke\Component\Psi\Exception\PsiException; |
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use PeekAndPoke\Component\Psi\Iterator\KeylessAppendIterator; |
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/** |
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* PsiFactory |
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* |
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* @author Karsten J. Gerber <[email protected]> |
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*/ |
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class DefaultPsiFactory implements PsiFactory |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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public function createSolver() |
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{ |
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return new DefaultOperationChainSolver(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function createIterator(array $iteratables, PsiOptions $options) |
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{ |
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$count = count($iteratables); |
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if ($count === 1) { |
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return $this->createSingleIterator($iteratables[0]); |
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} |
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if ($count > 1) { |
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return $this->createIteratorForMultipleInputs($iteratables, $options); |
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} |
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return new \ArrayIterator(); |
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} |
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/** |
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* @param array $iteratables |
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* @param PsiOptions $options |
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* |
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* @return \AppendIterator|KeylessAppendIterator |
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* |
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* @throws PsiException |
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*/ |
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protected function createIteratorForMultipleInputs(array $iteratables, PsiOptions $options) |
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{ |
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// when we have multiple inputs we need an option to decide on how to deal with colliding keys |
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if ($options->isPreserveKeysOfMultipleInputs()) { |
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// this iterator return the original keys of each child iterator |
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// -> this leads to conflicts OR means we preserve keys |
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$iterator = new \AppendIterator(); |
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} else { |
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// this iterator will create numeric keys from 0 .. n |
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$iterator = new KeylessAppendIterator(); |
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} |
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foreach ($iteratables as $iteratable) { |
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$iterator->append($this->createSingleIterator($iteratable)); |
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} |
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return $iterator; |
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} |
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/** |
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* @param mixed $iteratable |
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* |
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* @return \Iterator|\Traversable |
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* |
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* @throws PsiException |
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*/ |
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protected function createSingleIterator($iteratable) |
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{ |
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if ($iteratable === null) { |
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return new \ArrayIterator(); |
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} |
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if ($iteratable instanceof \Iterator) { |
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return $iteratable; |
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} |
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if ($iteratable instanceof \Traversable) { |
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return new \IteratorIterator($iteratable); |
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} |
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if (is_array($iteratable)) { |
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return new \ArrayIterator($iteratable); |
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} |
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throw new PsiException('Invalid input, not an array or an Iterator or a Traversable'); |
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} |
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} |
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PeekAndPoke /
psi
