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<?php |
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namespace ArgentCrusade\Selectel\CloudStorage\Collections; |
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use Iterator; |
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use Countable; |
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use ArrayAccess; |
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use JsonSerializable; |
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use ArgentCrusade\Selectel\CloudStorage\Contracts\Collections\CollectionContract; |
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class Collection implements CollectionContract, ArrayAccess, Countable, Iterator, JsonSerializable |
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{ |
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/** |
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* Collection items. |
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* |
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* @var array |
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*/ |
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protected $items = []; |
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/** |
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* Iterator position. |
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* |
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* @var int |
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*/ |
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protected $position = 0; |
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/** |
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* Collection keys. |
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* |
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* @var array |
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*/ |
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protected $keys = []; |
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/** |
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* @param array $items = [] |
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*/ |
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public function __construct(array $items = []) |
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{ |
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$this->items = $items; |
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$this->position = 0; |
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$this->keys = array_keys($items); |
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} |
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/** |
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* Determines if given key exists in current collection. |
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* |
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* @param mixed $key |
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* |
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* @return bool |
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*/ |
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public function has($key) |
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{ |
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return isset($this->items[$key]); |
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} |
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/** |
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* Retrieves item by given key from current collection. |
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* |
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* @param mixed $key |
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* |
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* @return mixed|null |
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*/ |
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public function get($key) |
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{ |
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return $this->has($key) ? $this->items[$key] : null; |
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} |
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/** |
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* Collection size. |
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* |
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* @return int |
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*/ |
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public function count() |
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{ |
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return count($this->items); |
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} |
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/** |
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* Determines if given offset exists in current collection. |
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* |
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* @param mixed $offset |
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* |
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* @return bool |
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*/ |
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public function offsetExists($offset) |
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{ |
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return $this->has($offset); |
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} |
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/** |
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* Puts value to given offset or appends it to current collection. |
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* |
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* @param mixed $offset |
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* @param mixed $value |
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*/ |
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public function offsetSet($offset, $value) |
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{ |
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if (is_null($offset)) { |
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$this->items[] = $value; |
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} else { |
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$this->items[$offset] = $value; |
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} |
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$this->keys = array_keys($this->items); |
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} |
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/** |
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* Retrieves given offset from current collection. |
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* Returns NULL if no value found. |
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* |
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* @param mixed $offset |
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* |
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* @return mixed|null |
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*/ |
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public function offsetGet($offset) |
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{ |
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return isset($this->items[$offset]) ? $this->items[$offset] : null; |
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} |
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/** |
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* Drops given offset from current collection. |
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* |
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* @param mixed $offset |
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*/ |
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public function offsetUnset($offset) |
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{ |
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unset($this->items[$offset]); |
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$this->keys = array_keys($this->items); |
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} |
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/** |
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* Rewinds iterator back to first position. |
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*/ |
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public function rewind() |
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{ |
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$this->position = 0; |
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} |
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/** |
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* Current iterator item. |
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* |
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* @return mixed|null |
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*/ |
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public function current() |
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{ |
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$currentKey = $this->keys[$this->position]; |
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return isset($this->items[$currentKey]) ? $this->items[$currentKey] : null; |
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} |
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/** |
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* Current iterator position. |
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* |
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* @return mixed |
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*/ |
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public function key() |
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{ |
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return $this->keys[$this->position]; |
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} |
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/** |
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* Increments iterator position. |
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*/ |
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public function next() |
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{ |
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$this->position++; |
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} |
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/** |
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* Determines if there is some value at current iterator position. |
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* |
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* @return bool |
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*/ |
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public function valid() |
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{ |
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if (!isset($this->keys[$this->position])) { |
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return false; |
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} |
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$currentKey = $this->keys[$this->position]; |
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return isset($this->items[$currentKey]); |
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} |
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/** |
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* JSON representation of collection. |
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* |
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* @return array |
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*/ |
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public function jsonSerialize() |
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{ |
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return $this->items; |
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} |
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} |
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ArgentCrusade /
selectel-cloud-storage
