中介者模式

中介者模式:用一个中介对象来封装一系列的对象交互。中介者使各对象不需要显示地相互引用,从而使其耦合松散,而且可以独立地改变它们之间的交互。

abstract  class Country
{

    protected  $mediator;

    public  function __construct(UnitedNations $mediator)
    {

        $this->mediator = $mediator;

    }

}

class USA extends  Country
{

    public function __construct(UnitedNations $mediator)
    {
        parent::__construct($mediator);
    }


    public  function  Declaration($message){

        $this->mediator->Declaration($message,$this);
    }

    public  function getMessage($message){

        echo "美国获得对方信息:".$message."<br>";

    }

}

class Iraq extends Country
{
    public function __construct(UnitedNations $mediator)
    {
        parent::__construct($mediator);
    }

    public function Declaration($message){

        $this->mediator->Declaration($message,$this);
    }

    public  function  getMessage($message){

        echo "伊拉克获得对方信息".$message."<br>";
    }

}

abstract  class UnitedNations
{


    public  abstract function Declaration($message,Country $country);

}

class UnitedNationsSecurityCouncil extends  UnitedNations
{


    public $usa;
    public $iraq;

    public   function Declaration($message,Country $country)
    {

        if($country == $this->usa){
            $this->usa->getMessage($message);
        }else{
            $this->iraq->getMessage($message);
        }




    }

}

$unit = new UnitedNationsSecurityCouncil();

$c1 = new USA($unit);

$c2 = new Iraq($unit);

$unit->usa =  $c1;
$unit->iraq = $c2;

$c1->Declaration("山姆大叔:伊拉克你有杀伤武器");

$c2->Declaration("萨达姆:我们没有杀伤武器");