怎么改变PHP中介者模式的交互？-群英

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代码如下:

 
  /**
 
 * 中介者模式
 
 *
 
 * 用一个中介对象来封装一系列的对象交互,使各对象不需要显式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 Mediator
 
 {
 
 abstract public function send($message,$colleague);
 
 }
 
 abstract class Colleague
 
 {
 
 private $_mediator = null;
 
 public function Colleague($mediator)
 
 {
 
 $this->_mediator = $mediator;
 
 }
 
 public function send($message)
 
 {
 
 $this->_mediator->send($message,$this);
 
 }
 
 abstract public function notify($message);
 
 }
 
 class ConcreteMediator extends Mediator
 
 {
 
 private $_colleague1 = null;
 
 private $_colleague2 = null;
 
 public function send($message,$colleague)
 
 {
 
 if($colleague == $this->_colleague1)
 
 {
 
 $this->_colleague1->notify($message);
 
 } else {
 
 $this->_colleague2->notify($message);
 
 }
 
 }
 
 public function set($colleague1,$colleague2)
 
 {
 
 $this->_colleague1 = $colleague1;
 
 $this->_colleague2 = $colleague2;
 
 }
 
 }
 
 class Colleague1 extends Colleague
 
 {
 
 public function notify($message)
 
 {
 
 echo "Colleague1 Message is :".$message."
 
";
 
 }
 
 }
 
 class Colleague2 extends Colleague
 
 {
 
 public function notify($message)
 
 {
 
 echo "Colleague2 Message is :".$message."
 
";
 
 }
 
 }
 
 //
 
 $objMediator = new ConcreteMediator();
 
 $objC1 = new Colleague1($objMediator);
 
 $objC2 = new Colleague2($objMediator);
 
 $objMediator->set($objC1,$objC2);
 
 $objC1->send("to c2 from c1");
 
 $objC2->send("to c1 from c2");