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<?php |
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/** |
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* This file is part of graze/data-node |
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* |
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* Copyright (c) 2016 Nature Delivered Ltd. <https://www.graze.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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* @license https://github.com/graze/data-node/blob/master/LICENSE.md |
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* @link https://github.com/graze/data-node |
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*/ |
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namespace Graze\DataNode; |
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use Graze\DataStructure\Collection\Collection; |
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use InvalidArgumentException; |
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/** |
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* Class NodeCollection |
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* |
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* A Collection of DataNodes that can be acted upon by a flow |
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* |
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* @package Graze\DataFlow\Node |
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*/ |
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class NodeCollection extends Collection implements NodeCollectionInterface |
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{ |
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/** |
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* @param mixed $value |
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* |
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* @return $this |
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*/ |
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public function add($value) |
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{ |
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if (!($value instanceof NodeInterface)) { |
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throw new InvalidArgumentException("The specified value does not implement NodeInterface"); |
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} |
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return parent::add($value); |
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} |
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/** |
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* @param callable $fn |
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* |
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* @return $this |
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*/ |
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public function apply(callable $fn) |
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{ |
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foreach ($this->items as &$item) { |
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$out = call_user_func($fn, $item); |
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if (isset($out) && ($out instanceof NodeInterface)) { |
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$item = $out; |
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} |
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} |
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return $this; |
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} |
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/** |
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* On clone, clone all flows too |
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*/ |
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public function __clone() |
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{ |
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foreach ($this->items as &$item) { |
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$item = clone $item; |
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} |
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} |
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/** |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return "NodeCollection"; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getClone() |
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{ |
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return clone $this; |
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} |
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/** |
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* Retrieve the first element that matches the optional callback |
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* |
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* @param callable|null $fn |
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* @param mixed|null $default |
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* |
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* @return mixed|null |
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*/ |
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public function first(callable $fn = null, $default = null) |
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{ |
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if (is_null($fn)) { |
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return count($this->items) > 0 ? reset($this->items) : $default; |
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} |
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foreach ($this->getIterator() as $value) { |
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if (call_user_func($fn, $value)) { |
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return $value; |
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} |
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} |
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return $default; |
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} |
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/** |
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* Receive the last element that matches the optional callback |
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* |
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* @param callable|null $fn |
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* @param mixed|null $default |
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* |
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* @return mixed|null |
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*/ |
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public function last(callable $fn = null, $default = null) |
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{ |
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if (is_null($fn)) { |
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return count($this->items) > 0 ? end($this->items) : $default; |
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} |
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2 |
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foreach (array_reverse($this->items) as $value) { |
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if (call_user_func($fn, $value)) { |
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return $value; |
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} |
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} |
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return $default; |
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} |
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} |
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graze /
data-node
