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<?php |
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declare(strict_types=1); |
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namespace Weblabltd\Component\Util\Collection; |
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/** |
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* Implements a list of prioritized objects that maintains the insertion order for items with the same priority. |
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*/ |
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class PrioritizedObjectList implements \Countable, \Iterator |
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{ |
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const DEFAULT_PRIORITY = 100; |
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/** |
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* @var array |
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*/ |
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private $objects = []; |
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/** |
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* @var array |
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*/ |
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private $indexes = []; |
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/** |
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* @var int |
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*/ |
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private $cursor = 0; |
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/** |
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* @var int |
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*/ |
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private $serial = PHP_INT_MAX; |
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/** |
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* For lazy sorting the list when that's necessary. |
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* |
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* @var bool |
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*/ |
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private $sorted = true; |
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/** |
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* Adds an object to the list. |
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* |
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* Adding an object that's already in the list will effectively override the same object |
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* |
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* @param object $object |
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* @param null|int $priority Priority should be a positive number. If NULL the DEFAULT_PRIORITY will be used |
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* |
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* @return PrioritizedObjectList |
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*/ |
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public function add(object $object, ?int $priority = self::DEFAULT_PRIORITY): PrioritizedObjectList |
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{ |
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if ($priority < 0) { |
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throw new \InvalidArgumentException( |
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sprintf('The priority should be a positive integer or null for the default priority, got %s instead', gettype($priority)) |
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); |
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} |
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$index = spl_object_hash($object); |
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if (!isset($this->objects[$index])) { |
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$this->objects[$index] = [$object, [$priority ?? static::DEFAULT_PRIORITY, $this->serial--]]; |
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$this->indexes[] = $index; |
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} else { |
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// if object is present just override it's priority |
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$this->objects[$index][1][0] = $priority ?? static::DEFAULT_PRIORITY; |
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} |
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// mark as not sorted |
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$this->sorted = false; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function count() |
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{ |
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return count($this->objects); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function current() |
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{ |
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$this->sort(); |
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if (!isset($this->indexes[$this->cursor])) { |
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throw new \OutOfBoundsException('There is no object at the current position'); |
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} |
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return $this->objects[$this->indexes[$this->cursor]][0]; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function next() |
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{ |
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$this->sort(); |
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++$this->cursor; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function key() |
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{ |
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$this->sort(); |
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return $this->cursor; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function valid() |
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{ |
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$this->sort(); |
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return isset($this->indexes[$this->cursor]); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function rewind() |
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{ |
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$this->sort(); |
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$this->cursor = 0; |
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} |
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/** |
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* Sorts the list. |
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*/ |
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private function sort(): void |
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{ |
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if ($this->sorted) { |
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return; |
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} |
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9 |
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uasort($this->objects, function ($o1, $o2) { |
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return $o2[1][0] <=> $o1[1][0]; |
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}); |
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$this->indexes = array_keys($this->objects); |
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$this->sorted = true; |
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} |
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} |
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weblabltd /
utilities
