PHP教程：php设计模式之委托模式

PHP教程
<?php
class Fruit
{
  function callFruit()
  {
    print "Generate an Apple";
  }
}
class FruitDelegator
{
 private $targets;
  function __construct()
  {
    $this->target[] = new Fruit();
  }
  
  function __call($name, $args)
  {
    foreach ($this->target as $obj)
    {
      $r = new ReflectionClass($obj);
      if ($method = $r->getMethod($name))
      {
        if ($method->isPublic() && !$method->isAbstract())
        {
          return $method->invoke($obj, $args);
        }
      }
    }
  }
}
$obj = new FruitDelegator();
$obj->callFruit();
// 运行结果
// Generate an Apple
?>

PHP教程
<?php
class Color
{
  function callColor()
  {
    print "Generate Red";
  }
}
 
class ColorDelegator
{
  private $targets;
   
  function addObject($obj)
  {
    $this->target[] = $obj;
  }
   
  function __call($name, $args)
  {
    foreach ($this->target as $obj)
    {
      $r = new ReflectionClass($obj);
      if ($method = $r->getMethod($name))
      {
        if ($method->isPublic() && !$method->isAbstract())
        {
          return $method->invoke($obj, $args);
        }
      }
    }
  }
}
$obj = new ColorDelegator();
$obj->addObject(new Color());
$obj->callColor();
?>

PHP教程
<?php 
//使用委托模式之前,调用cd类,选择cd播放模式是复杂的选择过程 
class cd { 
 protected $cdInfo = array(); 
  
 public function addSong($song) { 
  $this->cdInfo[$song] = $song; 
 } 
  
 public function playMp3($song) { 
  return $this->cdInfo[$song] . '.mp3'; 
 } 
  
 public function playMp4($song) { 
  return $this->cdInfo[$song] . '.mp4'; 
 } 
} 
$oldCd = new cd; 
$oldCd->addSong("1"); 
$oldCd->addSong("2"); 
$oldCd->addSong("3"); 
$type = 'mp3'; 
if ($type == 'mp3') { 
 $oldCd->playMp3(); 
} else { 
 $oldCd->playMp4(); 
}

PHP教程
<?php
 
namespace Tools;
 
/*
委托模式
去除核心对象中的判决和复杂功能性
*/
 
//委托接口
interface Delegate{
 public function playList($list,$song);
}
 
//mp3处理类
class mp3 implements Delegate{
 public function playList($list,$song){
  return $list[$song].'.mp3';
 }
}
 
//mp4处理类
class mp4 implements Delegate{
 public function playList($list, $song)
 {
  return $list[$song].'.mp4';
 }
}
 
class cdDelegate{
 protected $cdInfo = array();
 
 public function addSong($song){
  $this->cdInfo[$song] = $song;
 }
 
 public function play($type,$song){
  $name = '\Tools\\'.$type;
  $obj = new $name;
  return $obj->playList($this->cdInfo,$song);
 }
}
 
$newCd = new cdDelegate();
$newCd->addSong("1");
$newCd->addSong("2");
$newCd->addSong("3");
echo $newCd->play('mp3','1');//只要传递参数就能知道需要选择何种播放模式

PHP教程
<?php
/**
 * 委托模式 示例
 *
 * @create_date: 2010-01-04
 */
class PlayList
{
 var $_songs = array();
 var $_object = null;
 
 function PlayList($type)
 {
  $object = $type."PlayListDelegation";
  $this->_object = new $object();
 }
 
 function addSong($location,$title)
 {
  $this->_songs[] = array("location"=>$location,"title"=>$title);
 }
 
 function getPlayList()
 {
  return $this->_object->getPlayList($this->_songs);
 }
}
 
class mp3PlayListDelegation
{
 function getPlayList($songs)
 {
  $aResult = array();
  foreach($songs as $key=>$item)
  {
   $path = pathinfo($item['location']);
   if(strtolower($item['extension']) == "mp3")
   {
    $aResult[] = $item;
   }
  }
  return $aResult;
 }
}
 
class rmvbPlayListDelegation
{
 function getPlayList($songs)
 {
  $aResult = array();
  foreach($songs as $key=>$item)
  {
   $path = pathinfo($item['location']);
   if(strtolower($item['extension']) == "rmvb")
   {
    $aResult[] = $item;
   }
  }
  return $aResult;
 }
}
 
$oMP3PlayList = new PlayList("mp3");
$oMP3PlayList->getPlayList();
$oRMVBPlayList = new PlayList("rmvb");
$oRMVBPlayList->getPlayList();
?>