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<?php |
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/** |
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* Created by Gorlum 17.08.2016 23:08 |
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*/ |
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namespace Common; |
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use \SplObjectStorage; |
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/** |
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* Class IndexedObjectStorage |
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* @package Common |
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*/ |
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class IndexedObjectStorage extends \SplObjectStorage { |
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protected $index = array(); |
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/** |
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* Unassign index from object |
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* |
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* @param object $object |
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*/ |
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protected function indexUnset($object) { |
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if (($oldData = SplObjectStorage::offsetGet($object)) !== null) { |
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unset($this->index[$oldData]); |
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} |
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} |
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/** |
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* Function to handle assigning keys |
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* |
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* Primary for dealing with duplicates - child can overwrite function to handle duplicates by itself |
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* |
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* @param object $object |
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* @param mixed|null $data - null means remove index |
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* |
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* @throws \Exception |
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*/ |
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protected function indexSet($object, $data = null) { |
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// When calling indexSet - $object already SHOULD not have index associated in this concrete implementation |
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// Checking if index free. NULL index is always free |
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if (isset($this->index[$data])) { |
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throw new \Exception('Duplicate index [' . $data . '] in ' . __CLASS__); |
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} |
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if ($data !== null) { |
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// Assigning index |
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$this->index[$data] = $object; |
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} |
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} |
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/** |
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* @param mixed $index |
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* |
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* @return mixed|null |
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*/ |
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public function indexGetObject($index) { |
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return array_key_exists($index, $this->index) ? $this->index[$index] : null; |
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} |
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/** |
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* Rebuild index |
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*/ |
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protected function indexRebuild() { |
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$this->index = array(); |
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$this->rewind(); |
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while ($this->valid()) { |
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$this->indexSet($this->current(), $this->getInfo()); |
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$this->next(); |
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} |
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} |
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public function attach($object, $data = null) { |
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// If $object in storage - removing it's index from $indexes |
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if ($this->contains($object)) { |
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$this->indexUnset($object); |
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} |
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$this->indexSet($object, $data); |
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parent::attach($object, $data); |
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} |
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public function offsetSet($object, $data = null) { |
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$this->attach($object, $data); |
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} |
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public function detach($object) { |
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$this->indexUnset($object); |
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parent::detach($object); |
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} |
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public function offsetUnset($object) { |
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$this->detach($object); |
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parent::offsetUnset($object); |
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} |
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public function addAll($storage) { |
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// Adding new elements from storage |
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parent::addAll($storage); |
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// Original addAll overwrites indexes with those in input $storage - so we must refresh current indexes |
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$this->indexRebuild(); |
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} |
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public function removeAll($storage) { |
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parent::removeAll($storage); |
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$this->indexRebuild(); |
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} |
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public function removeAllExcept($storage) { |
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parent::removeAllExcept($storage); |
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$this->indexRebuild(); |
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} |
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public function unserialize($serialized) { |
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// Unserialize DOES NOT removes existing objects AND creates object copies making duplicates |
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// So be careful |
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parent::unserialize($serialized); |
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$this->indexRebuild(); |
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} |
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public function setInfo($data) { |
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if ($this->valid()) { |
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$this->indexUnset($this->current()); |
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$this->indexSet($this->current(), $data); |
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} |
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// Changing data in storage |
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parent::setInfo($data); |
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} |
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} |
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supernova-ws /
SuperNova
