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<!doctype html> |
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<html> |
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<head> |
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<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.7/css/materialize.min.css"> |
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<title>Device Bridge</title> |
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<body class="container"> |
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<h1>Bridge Design Pattern</h1> |
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<p><i>"decouple an abstraction from its implementation so that the two can vary independently"</i> (GoF 151) |
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<p>Demo is a derivative of <a href="http://www.newthinktank.com/2012/10/bridge-design-pattern-tutorial/">http://www.newthinktank.com/2012/10/bridge-design-pattern-tutorial/</a>. |
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<p>Note: A more competent programmer has not yet verified if this properly follows the Bridge Design Pattern. |
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<hr> |
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<?php |
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interface IEntertainmentDevice { |
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function button1pressed(); |
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function button2pressed(); |
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function button3pressed(); |
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function button4pressed(); |
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function button5pressed(); |
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} |
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abstract class EntertainmentDevice implements IEntertainmentDevice { |
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protected $state; |
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protected $maxSetting; |
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protected $volume; |
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public function button1pressed(){ |
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$this->state++; |
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$this->stateChange(); |
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} |
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public function button2pressed(){ |
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$this->state--; |
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$this->stateChange(); |
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} |
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public function button3pressed(){ |
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$this->volume++; |
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$this->volumeChange(); |
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} |
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public function button4pressed(){ |
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$this->volume--; |
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$this->volumeChange(); |
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} |
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public abstract function button5pressed(); |
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public abstract function deviceStateFeedback(); |
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public function stateChange(){ |
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$this->stateCheckMaxMin(); |
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$this->deviceStateFeedback(); |
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} |
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public function volumeChange(){ |
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$this->volumeCheckMaxMin(); |
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$this->deviceVolumeFeedback(); |
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} |
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public function stateCheckMaxMin(){ |
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if($this->state > $this->maxSetting) {$this->state = 0;} |
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elseif($this->state < 0 ) {$this->state = $this->maxSetting;} |
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} |
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public function volumeCheckMaxMin(){ |
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if($this->volume > 100) {$this->volume = 100;} |
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elseif($this->volume < 0 ) {$this->volume = 0;} |
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} |
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public function deviceVolumeFeedback(){ |
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echo "Volume set to " , intval($this->volume) ,"<br>"; //intval necessary to prevent invisible 0's (false) |
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} |
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} |
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class TVDevice extends EntertainmentDevice { |
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protected $picture_in_picture = false; |
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public function __construct($state,$maxSetting){ |
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$this->state = $state; |
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$this->maxSetting = $maxSetting; |
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} |
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public function button5pressed(){ |
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$this->mute(); |
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} |
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public function mute(){ |
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$this->volume = 0; |
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$this->volumeChange(); |
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} |
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public function pip(){ |
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$this->picture_in_picture = !$this->picture_in_picture; |
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$this->devicePipChange(); |
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} |
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public function devicePipChange(){ |
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$this->devicePipFeedback(); |
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} |
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public function devicePipFeedback(){ |
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echo "Turned Picture in Picture feature ", ($this->picture_in_picture? "On" : "Off") ,"<br>"; |
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} |
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public function deviceStateFeedback(){ |
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echo "Set channel to ", $this->state ,"<br>"; |
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} |
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} |
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class DVDPlayerDevice extends EntertainmentDevice { |
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protected $is_standby = false; |
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protected $play_state = "stopped"; |
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public function __construct($state,$maxSetting){ |
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$this->state = $state; |
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$this->maxSetting = $maxSetting; |
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} |
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public function standby(){ |
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$this->is_standby = !$this->is_standby; |
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$this->standbyStateChange(); |
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} |
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public function play(){ |
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$this->play_state = $this->play_state === "playing" ? "stopped" : "playing"; |
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$this->playStateChange(); |
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} |
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public function deviceStateFeedback(){ |
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echo "Skipped to DVD chapter ", intval($this->state) ,"<br>"; |
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} |
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public function deviceplayStateFeedback(){ |
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echo "DVD is ", $this->play_state ,"<br>"; |
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} |
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public function button5pressed(){ |
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$this->play(); |
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} |
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public function playStateChange(){ |
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$this->deviceplayStateFeedback(); |
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} |
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public function standbyStateFeedback(){ |
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echo "DVD Player is on", ($this->is_standby? " standby mode.": " and ready.") ,"<br>"; |
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} |
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public function standbyStateChange(){ |
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$this->standbyStateFeedback(); |
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} |
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} |
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abstract class RemoteControl { |
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protected $device; |
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public function __construct(EntertainmentDevice $device){ |
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$this->device = $device; |
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} |
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public function deviceStateFeedback(){ |
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$this->device->deviceStateFeedback(); |
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} |
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public function deviceVolumeFeedback(){ |
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$this->device->deviceVolumeFeedback(); |
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} |
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public function button1pressed(){ |
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$this->device->button1pressed(); |
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} |
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public function button2pressed(){ |
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$this->device->button2pressed(); |
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} |
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public function button3pressed(){ |
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$this->device->button3pressed(); |
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} |
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public function button4pressed(){ |
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$this->device->button4pressed(); |
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} |
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public function button5pressed(){ |
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$this->device->button5pressed(); |
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} |
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public abstract function button6pressed(); |
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} |
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class TVRemote extends RemoteControl { |
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public function button6pressed(){ |
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$this->device->pip(); |
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} |
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} |
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class DVDRemote extends RemoteControl { |
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public function button6pressed(){ |
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$this->device->standby(); |
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} |
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} |
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$test = new TVDevice(0,100); |
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$rem = new TVRemote($test); |
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$rem->button1pressed(); |
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$rem->button1pressed(); |
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$rem->button1pressed(); |
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$rem->button1pressed(); |
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$rem->button2pressed(); |
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$rem->button6pressed(); |
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$rem->button3pressed(); |
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$rem->button2pressed(); |
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$rem->button1pressed(); |
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$rem->button4pressed(); |
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$rem->button4pressed(); |
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$rem->button3pressed(); |
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$rem->button6pressed(); |
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echo "<hr>"; |
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$test = new DVDPlayerDevice(0,10); |
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$rem = new DVDRemote($test); |
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$rem->button5pressed(); |
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$rem->button3pressed(); |
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$rem->button3pressed(); |
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$rem->button5pressed(); |
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$rem->button6pressed(); |
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$rem->button6pressed(); |
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$rem->button2pressed(); |
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$rem->button1pressed(); |
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$rem->button4pressed(); |
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$rem->button4pressed(); |
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$rem->button3pressed(); |
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$rem->button6pressed(); |
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?> |
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<hr> |
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<p> Eh? |
