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<?php |
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/* |
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* This file is part of NodalFlow. |
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* (c) Fabrice de Stefanis / https://github.com/fab2s/NodalFlow |
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* This source file is licensed under the MIT license which you will |
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* find in the LICENSE file or at https://opensource.org/licenses/MIT |
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*/ |
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namespace fab2s\NodalFlow\Nodes; |
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use fab2s\NodalFlow\Flows\FlowInterface; |
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use fab2s\NodalFlow\NodalFlow; |
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use fab2s\NodalFlow\NodalFlowException; |
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use Generator; |
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/** |
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* class AggregateNode |
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*/ |
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class AggregateNode extends PayloadNodeAbstract implements AggregateNodeInterface |
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{ |
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/** |
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* The underlying pseudo Flow |
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* |
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* @var FlowInterface |
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*/ |
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protected $payload; |
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/** |
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* Instantiate an Aggregate Node |
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* |
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* @param bool $isAReturningVal |
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* |
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* @throws NodalFlowException |
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*/ |
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public function __construct(bool $isAReturningVal) |
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{ |
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parent::__construct(new NodalFlow, $isAReturningVal); |
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$this->isATraversable = true; |
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} |
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/** |
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* Add a traversable to the aggregate |
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* |
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* @param TraversableNodeInterface $node |
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* |
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* @throws NodalFlowException |
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* |
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* @return $this |
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*/ |
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public function addTraversable(TraversableNodeInterface $node): AggregateNodeInterface |
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{ |
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$this->payload->add($node); |
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return $this; |
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} |
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/** |
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* Get the traversable to traverse within the Flow |
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* |
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* @param mixed $param |
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* |
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* @return Generator |
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*/ |
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public function getTraversable($param = null): iterable |
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{ |
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$value = null; |
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/** @var $nodes TraversableNodeInterface[] */ |
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$nodes = $this->payload->getNodes(); |
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foreach ($nodes as $node) { |
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$returnVal = $node->isReturningVal(); |
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foreach ($node->getTraversable($param) as $value) { |
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if ($returnVal) { |
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yield $value; |
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continue; |
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} |
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yield $param; |
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} |
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if ($returnVal) { |
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// since this node is returning something |
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// we will pass its last yield to the next |
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// traversable. It will be up to him to |
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// do whatever is necessary with it, including |
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// nothing |
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$param = $value; |
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} |
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} |
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} |
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/** |
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* Execute the BranchNode |
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* |
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* @param mixed $param |
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* |
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* @throws NodalFlowException |
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*/ |
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public function exec($param = null) |
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{ |
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throw new NodalFlowException('AggregateNode cannot be executed, use getTraversable to iterate instead'); |
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} |
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} |
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fab2s /
NodalFlow
