PHP設(shè)計(jì)模式之適配器模式（Adapter）原理與用法詳解

?php
//早期的一個用戶類，只實(shí)現(xiàn)獲取用戶名的方法
class UserInfo {
    public function getUserName() {
        return 'initphp';
    }
}

//MyOldObject類，從UserInfo類中獲取信息，輸出用戶名
?php
include_once("UserInfo.php");
class MyOldObject {
    public function write() {
        $UserInfo = new UserInfo;
        echo $UserInfo->getUserName();
    }
}
$a = new MyOldObject;
$a->write();

?php
include_once("UserInfo.php");
class UserInfoAdapter extends UserInfo{
    public function getUserAge() {
        return 28;
    }
    public function getUser() {
        return array(
            'username' => $this->getUserName(),
            'age' => $this->getUserAge()
        );
    }
}

?php
include_once("UserInfoAdapter.php");
class MyNewObject {
    public function write() {
        $UserInfoAdapter = new UserInfoAdapter;
        print_r($UserInfoAdapter->getUser());
    }
}
$a = new MyNewObject;
$a->write();

abstract class Toy
{
  public abstract function openMouth();
  public abstract function closeMouth();
}
class Dog extends Toy
{
  public function openMouth()
  {
    echo "Dog open Mouth\n";
  }
  public function closeMouth()
  {
    echo "Dog open Mouth\n";
  }
}
class Cat extends Toy
{
  public function openMouth()
  {
    echo "Cat open Mouth\n";
  }
  public function closeMouth()
  {
    echo "Cat open Mouth\n";
  }
}

?php
abstract class Toy
{
  public abstract function openMouth();
  public abstract function closeMouth();
}
class Dog extends Toy
{
  public function openMouth()
  {
    echo "Dog open Mouth\n";
  }
  public function closeMouth()
  {
    echo "Dog close Mouth\n";
  }
}
class Cat extends Toy
{
  public function openMouth()
  {
    echo "Cat open Mouth\n";
  }
  public function closeMouth()
  {
    echo "Cat close Mouth\n";
  }
}
//目標(biāo)角色:紅棗遙控公司
interface RedTarget
{
  public function doMouthOpen();
  public function doMouthClose();
}
//目標(biāo)角色:綠棗遙控公司及
interface GreenTarget
{
  public function operateMouth($type = 0);
}
//類適配器角色:紅棗遙控公司
class RedAdapter implements RedTarget
{
  private $adaptee;
  function __construct(Toy $adaptee)
  {
    $this->adaptee = $adaptee;
  }
  //委派調(diào)用Adaptee的sampleMethod1方法
  public function doMouthOpen()
  {
    $this->adaptee->openMouth();
  }
  public function doMouthClose()
  {
    $this->adaptee->closeMouth();
  }
}
//類適配器角色:綠棗遙控公司
class GreenAdapter implements GreenTarget
{
  private $adaptee;
  function __construct(Toy $adaptee)
  {
    $this->adaptee = $adaptee;
  }
  //委派調(diào)用Adaptee：GreenTarget的operateMouth方法
  public function operateMouth($type = 0)
  {
    if ($type) {
      $this->adaptee->openMouth();
    } else {
      $this->adaptee->closeMouth();
    }
  }
}
class testDriver
{
  public function run()
  {
     //實(shí)例化一只狗玩具
    $adaptee_dog = new Dog();
    echo "給狗套上紅棗適配器\n";
    $adapter_red = new RedAdapter($adaptee_dog);
    //張嘴
    $adapter_red->doMouthOpen();
    //閉嘴
    $adapter_red->doMouthClose();
    echo "給狗套上綠棗適配器\n";
    $adapter_green = new GreenAdapter($adaptee_dog);
    //張嘴
    $adapter_green->operateMouth(1);
    //閉嘴
    $adapter_green->operateMouth(0);
  }
}
$test = new testDriver();
$test->run();

//類適配器使用的是繼承
?php
/**
 * 目標(biāo)角色
 */
interface Target {
 /**
  * 源類也有的方法1
  */
 public function sampleMethod1();
 /**
  * 源類沒有的方法2
  */
 public function sampleMethod2();
}
/**
 * 源角色
 */
class Adaptee {
 /**
  * 源類含有的方法
  */
 public function sampleMethod1() {
  echo 'Adaptee sampleMethod1 br />';
 }
}
/**
 * 類適配器角色
 */
class Adapter extends Adaptee implements Target {
 /**
  * 源類中沒有sampleMethod2方法，在此補(bǔ)充
  */
 public function sampleMethod2() {
  echo 'Adapter sampleMethod2 br />';
 }
}
class Client {
 /**
  * Main program.
  */
 public static function main() {
  $adapter = new Adapter();
  $adapter->sampleMethod1();
  $adapter->sampleMethod2();
 }
}
Client::main();
?>

//對象適配器使用的是委派
?php
/**
 * 目標(biāo)角色
 */
interface Target {
 /**
  * 源類也有的方法1
  */
 public function sampleMethod1();
 /**
  * 源類沒有的方法2
  */
 public function sampleMethod2();
}
/**
 * 源角色
 */
class Adaptee {
 /**
  * 源類含有的方法
  */
 public function sampleMethod1() {
  echo 'Adaptee sampleMethod1 br />';
 }
}
/**
 * 類適配器角色
 */
class Adapter implements Target {
 private $_adaptee;
 public function __construct(Adaptee $adaptee) {
  $this->_adaptee = $adaptee;
 }
 /**
  * 委派調(diào)用Adaptee的sampleMethod1方法
  */
 public function sampleMethod1() {
  $this->_adaptee->sampleMethod1();
 }
 /**
  * 源類中沒有sampleMethod2方法，在此補(bǔ)充
  */
 public function sampleMethod2() {
  echo 'Adapter sampleMethod2 br />';
 }
}
class Client {
 /**
  * Main program.
  */
 public static function main() {
  $adaptee = new Adaptee();
  $adapter = new Adapter($adaptee);
  $adapter->sampleMethod1();
  $adapter->sampleMethod2();
 }
}
Client::main();
?>