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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\NodalFlowException; |
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/** |
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* abstract Class NodeAbstract |
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*/ |
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abstract class NodeAbstract implements NodeInterface |
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{ |
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/** |
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* The carrying Flow |
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* |
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* @var FlowInterface |
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*/ |
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public $carrier; |
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/** |
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* Indicate if this Node is traversable |
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* |
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* @var bool |
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*/ |
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protected $isATraversable; |
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/** |
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* Indicate if this Node is returning a value |
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* |
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* @var bool |
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*/ |
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protected $isAReturningVal; |
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/** |
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* Indicate if this Node is a Flow (Branch) |
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* |
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* @var bool |
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*/ |
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protected $isAFlow; |
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/** |
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* Instantiate a Node |
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*/ |
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public function __construct() |
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{ |
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$this->enforceIsATraversable(); |
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} |
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/** |
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* Indicate if this Node is Traversable |
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* |
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* @return bool |
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*/ |
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public function isTraversable() |
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{ |
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return (bool) $this->isATraversable; |
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} |
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/** |
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* Indicate if this Node is a Flow (Branch) |
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* |
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* @return bool true if this node instanceof FlowInterface |
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*/ |
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public function isFlow() |
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{ |
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return (bool) $this->isAFlow; |
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} |
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/** |
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* Indicate if this Node is returning a value |
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* |
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* @return bool true if this node is expected to return |
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* something to pass on next node as param. |
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* If nothing is returned, the previously |
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* returned value will be use as param |
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* for next nodes. |
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*/ |
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public function isReturningVal() |
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{ |
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return (bool) $this->isAReturningVal; |
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} |
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/** |
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* Set carrying Flow |
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* |
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* @param FlowInterface $flow |
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* |
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* @return $this |
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*/ |
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public function setCarrier(FlowInterface $flow) |
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{ |
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$this->carrier = $flow; |
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return $this; |
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} |
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/** |
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* Get carrying Flow |
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* |
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* @return FlowInterface |
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*/ |
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public function getCarrier() |
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{ |
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return $this->carrier; |
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} |
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/** |
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* Get this Node's hash, must be deterministic and unique |
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* |
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* Caching the result would save a bit of resources |
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* but would require to implement `__clone()` to |
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* make sure we reset the hash should a node be cloned. |
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* Doing this would add the burden to actual Node |
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* implementation to trigger `parent::_clone()` |
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* which is not ideal and impossible to guaranty. |
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* Now since this method is not used in the actual |
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* flow execution loop, but only when an interruption |
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* is raised, it's not a performance issue. |
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* |
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* @return string |
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*/ |
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public function getNodeHash() |
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{ |
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return \sha1(\spl_object_hash($this)); |
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} |
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/** |
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* Make sure this Node is consistent |
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* |
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* @throws NodalFlowException |
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* |
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* @return $this |
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*/ |
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protected function enforceIsATraversable() |
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{ |
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if ($this->isFlow()) { |
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if ($this->isATraversable) { |
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throw new NodalFlowException('Cannot Traverse a Branch'); |
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} |
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return $this; |
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} |
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if ($this->isATraversable) { |
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if (!($this instanceof TraversableNodeInterface)) { |
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throw new NodalFlowException('Cannot Traverse a Node that does not implement TraversableNodeInterface'); |
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} |
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return $this; |
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} |
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if (!($this instanceof ExecNodeInterface)) { |
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throw new NodalFlowException('Cannot Exec a Node that does not implement ExecNodeInterface'); |
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} |
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return $this; |
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} |
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} |
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fab2s /
NodalFlow
