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<?php |
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namespace PHPKitchen\Platform\Struct; |
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use PHPKitchen\Platform\Contract; |
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use PHPKitchen\Platform\Mixin\Properties; |
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/** |
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* Represents implementation of array based collection. |
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* |
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* @author Dmitry Kolodko <[email protected]> |
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* @since 1.0 |
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*/ |
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class Collection implements Contract\Struct\Collection, Contract\Data\ValueObject { |
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use Mixin\StructureOfElementsMethods; |
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use Mixin\CountableMethods; |
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use Mixin\IteratorMethods; |
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use Mixin\JsonSerializableMethods; |
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use Properties; |
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public function __construct($elements = []) { |
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$this->elements = $elements; |
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} |
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/** |
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* Named constructor. |
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* |
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* @param array|iterable $elements elements of collection. |
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* |
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* @return Collection new collection of specified elements. |
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* |
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* @since 1.0 |
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*/ |
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public static function of($elements): Contract\Struct\Collection { |
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return new static($elements); |
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} |
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/** |
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* Add element to the end of the collection. |
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* |
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* @param mixed $element element to add. |
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* |
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* @since 1.0 |
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*/ |
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public function add($element): void { |
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$this->elements[] = $element; |
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} |
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/** |
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* Push one or more elements onto the end of collection. |
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* Example: |
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* ```php |
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* $collection->push(1, 2, 3, 4); |
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* ``` |
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* |
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* @param array ...$elements elements. |
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* |
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* @return int the new number of elements in the array. |
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* |
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* @since 1.0 |
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*/ |
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public function push(...$elements): int { |
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return array_push($this->elements, ...$elements); |
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} |
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/** |
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* Pad collection to the specified length with a value. |
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* |
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* @param int $size new size of the collection. If size is |
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* positive then the collection is padded on the right, if it's negative then |
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* on the left. If the absolute value of size is less than or equal to |
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* the length of the collection then no padding takes place. |
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* @param mixed $value Value to pad if input is less than `size`. |
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* |
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* @since 1.0 |
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*/ |
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public function pad(int $size, $value = null): void { |
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$this->elements = array_pad($this->elements, $size, $value); |
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} |
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/** |
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* Split collection into chunks of specified size. |
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* |
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* @param int $size size of each chunk. |
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* |
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* @return Collection a multidimensional numerically indexed collection, starting with zero, |
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* with each dimension containing collection of specified size. |
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* |
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* @since 1.0 |
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*/ |
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View Code Duplication |
public function chunkBy(int $size): Contract\Struct\Collection { |
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$chunks = array_chunk($this->elements, $size, $keepKeys = false); |
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$collections = static::of([]); |
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foreach ($chunks as $chunk) { |
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$collections->add(static::of($chunk)); |
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} |
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return $collections; |
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} |
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/** |
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* Split collection into chunks of specified size keeping original indexes. |
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* |
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* @param int $size size of each chunk. |
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* |
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* @return Collection a multidimensional numerically indexed collection, starting with zero, |
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* with each dimension containing collection of specified size and keys equal to original keys |
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* of elements. |
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* |
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* @since 1.0 |
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*/ |
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View Code Duplication |
public function chunkKeepingKeysBy(int $size): Contract\Struct\Collection { |
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$chunks = array_chunk($this->elements, $size, $keepKeys = true); |
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$collections = static::of([]); |
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foreach ($chunks as $chunk) { |
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$collections->add(static::of($chunk)); |
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} |
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return $collections; |
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} |
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/** |
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* Gets keys of the collection. |
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* |
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* @return Collection collection of the collection keys. |
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*/ |
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public function getKeys(): Contract\Struct\Collection { |
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return static::of(array_keys($this->elements)); |
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} |
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/** |
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* Gets values of the collection. |
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* |
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* @return Contract\Struct\Collection collection of the collection keys. |
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*/ |
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public function getValues(): Contract\Struct\Collection { |
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return static::of(array_values($this->elements)); |
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} |
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///endregion |
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/// |
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/// region ----------------- ARRAY ACCESS METHODS ----------------- |
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/** |
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* Whether a offset exists |
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* |
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* @link http://php.net/manual/en/arrayaccess.offsetexists.php |
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* |
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* @param mixed $offset An offset to check for. |
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* |
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* @return boolean true on success or false on failure. |
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* The return value will be casted to boolean if non-boolean was returned. |
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* |
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* @since 1.0 |
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*/ |
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public function offsetExists($offset) { |
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return $this->hasKey($offset); |
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} |
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/** |
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* Offset to retrieve |
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* |
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* @link http://php.net/manual/en/arrayaccess.offsetget.php |
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* |
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* @param mixed $offset the offset to retrieve. |
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* |
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* @return mixed Can return all value types. |
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* |
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* @since 1.0 |
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*/ |
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public function offsetGet($offset) { |
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return $this->elements[$offset] ?? null; |
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} |
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/** |
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* Offset to set |
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* |
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* @link http://php.net/manual/en/arrayaccess.offsetset.php |
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* |
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* @param mixed $offset The offset to assign the value to. |
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* @param mixed $value the value to set. |
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* |
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* @return void |
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* |
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* @since 1.0 |
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*/ |
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public function offsetSet($offset, $value) { |
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if ($offset === null) { |
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$this->elements[] = $value; |
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} else { |
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$this->elements[$offset] = $value; |
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} |
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} |
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/** |
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* Offset to unset |
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* |
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* @link http://php.net/manual/en/arrayaccess.offsetunset.php |
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* |
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* @param mixed $offset the offset to unset. |
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* |
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* @return void |
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* |
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* @since 1.0 |
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*/ |
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public function offsetUnset($offset) { |
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unset($this->elements[$offset]); |
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} |
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/// endregion |
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} |