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<?php |
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namespace Pinq\Iterators\Common; |
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use Pinq\Iterators\IIterator; |
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/** |
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* Common functionality for the projection iterator |
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* |
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* @author Elliot Levin <[email protected]> |
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*/ |
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trait ProjectionIterator |
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{ |
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/** |
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* @var callable|null |
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*/ |
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private $keyProjectionFunction; |
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/** |
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* @var callable|null |
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*/ |
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private $valueProjectionFunction; |
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protected function __constructIterator( |
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callable $keyProjectionFunction = null, |
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callable $valueProjectionFunction = null |
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) { |
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$this->keyProjectionFunction = $keyProjectionFunction === null ? |
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null : Functions::allowExcessiveArguments($keyProjectionFunction); |
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$this->valueProjectionFunction = $valueProjectionFunction === null ? |
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null : Functions::allowExcessiveArguments($valueProjectionFunction); |
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} |
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final protected function projectElement(&$key, &$value) |
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{ |
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$keyProjectionFunction = $this->keyProjectionFunction; |
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$valueProjectionFunction = $this->valueProjectionFunction; |
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$keyCopy = $key; |
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$valueCopy = $value; |
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if ($keyProjectionFunction !== null) { |
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$keyCopyForKey = $keyCopy; |
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$valueCopyForKey = $valueCopy; |
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$keyProjection = $keyProjectionFunction($valueCopyForKey, $keyCopyForKey); |
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} else { |
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$keyProjection =& $key; |
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} |
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if ($valueProjectionFunction !== null) { |
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$keyCopyForValue = $keyCopy; |
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$valueCopyForValue = $valueCopy; |
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$valueProjection = $valueProjectionFunction($valueCopyForValue, $keyCopyForValue); |
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} else { |
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$valueProjection =& $value; |
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} |
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return [&$keyProjection, &$valueProjection]; |
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} |
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/** |
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* @return IIterator |
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*/ |
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abstract protected function getSourceIterator(); |
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/** |
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* @return bool |
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*/ |
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final public function isArrayCompatible() |
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{ |
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return $this->keyProjectionFunction === null && $this->getSourceIterator()->isArrayCompatible(); |
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} |
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} |
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TimeToogo /
Pinq
