PHP設(shè)計(jì)模式之中介者模式(Mediator Pattern)入門與應(yīng)用案例詳解

?php
class CD {
 public $band = '';
 public $title = '';
 protected $_mediator;

 public function __construct(MusicContainerMediator $mediator = NULL) {
 $this->_mediator = $mediator;
 }

 public function save() {
 //具體實(shí)現(xiàn)待定
 var_dump($this);
 }

 public function changeBandName($bandname) {
 if ( ! is_null($this->_mediator)) {
  $this->_mediator->change($this, array("band" => $bandname));
 }
 $this->band = $bandname;
 $this->save();
 }
}
//MP3Archive類
class MP3Archive {
 protected $_mediator;

 public function __construct(MusicContainerMediator $mediator = NULL) {
 $this->_mediator = $mediator;
 }

 public function save() {
 //具體實(shí)現(xiàn)待定
 var_dump($this);
 }

 public function changeBandName($bandname) {
 if ( ! is_null($this->_mediator)) {
  $this->_mediator->change($this, array("band" => $bandname));
 }
 $this->band = $bandname;
 $this->save();
 }

}

 //中介者類
class MusicContainerMediator {
 protected $_containers = array();

 public function __construct() {
 $this->_containers[] = "CD";
 $this->_containers[] = "MP3Archive";
 }

 public function change($originalObject, $newValue) {
 $title = $originalObject->title;
 $band = $originalObject->band;
 foreach ($this->_containers as $container) {
  if ( ! ($originalObject instanceof $container)) {
  $object = new $container;
  $object->title = $title;
  $object->band = $band;
  foreach ($newValue as $key => $val) {
   $object->$key = $val;
  }
  $object->save();
  }
 }
 }
}

//測(cè)試實(shí)例
$titleFromDB = "Waste of a Rib";
$bandFromDB = "Never Again";
$mediator = new MusicContainerMediator();
$cd = new CD($mediator);
$cd->title = $titleFromDB;
$cd->band = $bandFromDB;
$cd->changeBandName("Maybe Once More");

//抽象同事類，家教
abstract class Tutor{
  protected $message;  //個(gè)人信息
  protected $mediator; //為家教服務(wù)的中介機(jī)構(gòu)
  function __construct($message,Mediator $mediator){
    $this->message = $message;
    $this->mediator = $mediator;
  }
  //獲取個(gè)人信息
  function getMessage(){
    return $this->message;
  }
  //找學(xué)生
  abstract function findStudent();
}
//具體同事類,大學(xué)生家教
class UndergraduateTutor extends Tutor{
  //家教類型
  public $type = "UndergraduateTutor";

  function __construct($message,Mediator $mediator){
     parent::__construct($message,$mediator);
  }
  //找學(xué)生,讓中介機(jī)構(gòu)代為尋找
  function findStudent(){
     $this->mediator->matchStudent($this);
  }
}
//具體同事類,高中生家教
class SeniorStudentTutor extends Tutor{
  //家教類型
  public $type = "SeniorStudentTutor";

  function __construct($message,Mediator $mediator){
     parent::__construct($message,$mediator);
  }
  //找學(xué)生,讓中介機(jī)構(gòu)代為尋找
  function findStudent(){
     $this->mediator->matchStudent($this);
  }
}
//具體同事類,初中生家教
class MiddleStudentTutor extends Tutor{
  //家教類型
  public $type = "MiddleStudentTutor";

  function __construct($message,Mediator $mediator){
     parent::__construct($message,$mediator);
  }
  //找學(xué)生,讓中介機(jī)構(gòu)代為尋找
  function findStudent(){
     $this->mediator->matchStudent($this);
  }
}

//抽象中介類
abstract class AbstractMediator{
  abstract function matchStudent(Tutor $tutor);
}
//具體中介類，為家教匹配合適的學(xué)生
class Mediator extends AbstractMediator{
  //定義其服務(wù)的所有家教，不在范圍內(nèi)的不服務(wù)
  private $serveObject = array("UndergraduateTutor","SeniorStudentTutor","MiddleStudentTutor");
  //匹配學(xué)生
  function matchStudent(Tutor $tutor){
     for($i=0;$icount($this->serveObject);$i++){
       if($tutor->type == $this->serveObject[$i]){
         $message = $tutor->getMessage();
         echo "該家教個(gè)人信息為".print_r($message)."br/>將為其匹配合適的學(xué)生";
         break;
       }
     }
     if($i>=count($this->serveObject)){
       echo "該家教不在我中介機(jī)構(gòu)服務(wù)范圍內(nèi)";
     }
  }
}

//測(cè)試
$mediator = new Mediator();
$undergraduateTutor = new UndergraduateTutor(array("name"=>"張三","age"=>22),$mediator);
$undergraduateTutor->findStudent();
//結(jié)果：該家教個(gè)人信息為 Array ( [name] => 張三 [age] => 22 ),將為其匹配合適的學(xué)生