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<?php |
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namespace Alchemy\Resource\Metadata; |
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class LazyMetadataIterator implements MetadataIterator |
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{ |
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/** |
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* @var MetadataIterator |
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*/ |
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private $iterator; |
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/** |
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* @var callable |
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*/ |
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private $factory; |
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/** |
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* @param callable $factory A callback that returns a MetadataIterator instance |
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*/ |
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public function __construct(callable $factory) |
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{ |
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$this->factory = $factory; |
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} |
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private function getIterator() |
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{ |
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if ($this->iterator === null) { |
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$factory = $this->factory; |
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$this->iterator = $factory(); |
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} |
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return $this->iterator; |
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} |
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/** |
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* (PHP 5 >= 5.0.0)<br/> |
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* Move forward to next element |
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* @link http://php.net/manual/en/iterator.next.php |
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* @return void Any returned value is ignored. |
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*/ |
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public function next() |
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{ |
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$this->getIterator()->next(); |
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} |
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/** |
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* (PHP 5 >= 5.0.0)<br/> |
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* Return the key of the current element |
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* @link http://php.net/manual/en/iterator.key.php |
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* @return mixed scalar on success, or null on failure. |
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*/ |
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public function key() |
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{ |
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return $this->getIterator()->key(); |
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} |
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/** |
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* (PHP 5 >= 5.0.0)<br/> |
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* Checks if current position is valid |
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* @link http://php.net/manual/en/iterator.valid.php |
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* @return boolean The return value will be casted to boolean and then evaluated. |
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* Returns true on success or false on failure. |
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*/ |
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public function valid() |
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{ |
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return $this->getIterator()->valid(); |
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} |
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/** |
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* (PHP 5 >= 5.0.0)<br/> |
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* Rewind the Iterator to the first element |
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* @link http://php.net/manual/en/iterator.rewind.php |
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* @return void Any returned value is ignored. |
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*/ |
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public function rewind() |
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{ |
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$this->getIterator()->rewind(); |
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} |
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/** |
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* @return Metadata |
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*/ |
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public function current() |
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{ |
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return $this->getIterator()->current(); |
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} |
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} |
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alchemy-fr /
resource-component
