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<?php |
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declare(strict_types=1); |
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namespace unreal4u\MQTT\Protocol\Subscribe; |
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use unreal4u\MQTT\Exceptions\InvalidQoSLevel; |
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/** |
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* When the client wants to subscribe to a topic, this is done by adding a topic filter. |
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*/ |
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final class Topic |
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{ |
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/** |
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* The 1st byte can contain some bits |
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* |
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* The order of these flags are: |
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* |
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* 7-6-5-4-3-2-1-0 |
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* b'0-0-0-0-0-0-0-0' |
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* |
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* Bit 7-4: Control packet value ID (3 for PUBLISH) |
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* Bit 3: Duplicate delivery of a PUBLISH Control Packet |
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* Bit 2 & 1: PUBLISH Quality of Service |
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* Bit 0: PUBLISH Retain flag |
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* |
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* @see http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Table_2.2_- |
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* @var string |
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*/ |
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private $topicName = ''; |
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/** |
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* The QoS lvl, choose between 0 and 2 |
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* @var int |
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*/ |
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private $qosLevel = 0; |
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/** |
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* Topic constructor. |
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* @param string $topicName |
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* @param int $qosLevel |
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* @throws \unreal4u\MQTT\Exceptions\InvalidQoSLevel |
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* @throws \InvalidArgumentException |
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*/ |
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public function __construct(string $topicName, int $qosLevel = 0) |
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{ |
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$this |
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->setTopicName($topicName) |
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->setQoSLevel($qosLevel); |
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} |
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/** |
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* Contains the name of the Topic Filter |
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* |
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* @param string $topicName |
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* @return Topic |
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* @throws \InvalidArgumentException |
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*/ |
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private function setTopicName(string $topicName): Topic |
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{ |
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if ($topicName === '') { |
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1 |
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throw new \InvalidArgumentException('Topic name must be set'); |
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} |
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$this->topicName = $topicName; |
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return $this; |
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} |
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/** |
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* Requested QoS level is the maximum QoS level at which the Server can send Application Messages to the Client |
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* |
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* @param int $qosLevel |
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* @return Topic |
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* @throws \unreal4u\MQTT\Exceptions\InvalidQoSLevel |
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*/ |
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private function setQoSLevel(int $qosLevel): Topic |
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{ |
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4 |
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if ($qosLevel > 2 || $qosLevel < 0) { |
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1 |
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throw new InvalidQoSLevel('The provided QoS level is invalid'); |
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} |
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3 |
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$this->qosLevel = $qosLevel; |
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3 |
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return $this; |
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} |
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/** |
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* @return string |
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*/ |
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3 |
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public function getTopicName(): string |
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{ |
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3 |
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return $this->topicName; |
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} |
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/** |
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* @return int |
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*/ |
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3 |
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public function getTopicQoSLevel(): int |
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{ |
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3 |
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return $this->qosLevel; |
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} |
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} |
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unreal4u /
mqtt
