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<?php |
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declare(strict_types=1); |
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namespace unreal4u\MQTT\Internals; |
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use unreal4u\MQTT\DataTypes\TopicFilter; |
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use unreal4u\MQTT\Exceptions\MustContainTopic; |
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/** |
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* Trait ReadableContent |
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* @package unreal4u\MQTT\Internals |
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*/ |
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trait TopicFilterFunctionality |
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{ |
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/** |
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* The list of topics, being a SplQueue ensures the order is correct |
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* @var \SplQueue |
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*/ |
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private $topics; |
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/** |
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* Unordered list of topic names in order to avoid duplicates |
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* @var array |
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*/ |
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private $topicHashTable = []; |
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/** |
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* A subscription is based on filters, this function allows us to pass on filters |
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* |
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* @param TopicFilter[] $topics |
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* @return self |
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*/ |
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final public function addTopics(TopicFilter ...$topics): self |
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{ |
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foreach ($topics as $topic) { |
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// Frequently used: topicName, make it an apart variable for easy access |
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$topicName = $topic->getTopicFilter(); |
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if (\in_array($topicName, $this->topicHashTable, true) === false) { |
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// Personally, I find this hacky as hell. However, using the SPL library there seems to be no other way |
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$this->topicHashTable[] = $topicName; |
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$this->topics->enqueue($topic); |
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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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* Returns the current number of topics |
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* |
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* @return int |
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*/ |
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private function getNumberOfTopics(): int |
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{ |
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return $this->topics->count(); |
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} |
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/** |
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* Returns the topics in the order they were inserted / requested |
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* |
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* The order is important because SUBACK will return the status code for each topic in this order, without |
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* explicitly identifying which topic is which |
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* |
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* @return \Generator|TopicFilter[] |
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* @throws \unreal4u\MQTT\Exceptions\MustContainTopic |
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*/ |
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private function getTopics(): \Generator |
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{ |
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if ($this->getNumberOfTopics() === 0) { |
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throw new MustContainTopic('Before getting a topic, you should set it'); |
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} |
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for ($this->topics->rewind(); $this->topics->valid(); $this->topics->next()) { |
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yield $this->topics->current(); |
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} |
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} |
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} |
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unreal4u /
mqtt
