PHP设计模式之适配器模式原理与用法分析

<?php
/**
*  类适配器模式
*        以货币兑换为例
**/
//美元计算类
class DollarCalc
{
  private $dollar;
  private $product;
  private $service;
  public $rate = 1;
  public function requestCalc($product,$service)
  {
    $this->product = $product;
    $this->service = $service;
    $this->dollar = $this->product + $this->service;
    return $this->requestTotal();
  }
  public function requestTotal()
  {
    $this->dollar *= $this->rate;
    return $this->dollar;
  }
}
//欧元计算类
class EuroCalc
{
  private $euro;
  private $product;
  private $service;
  public $rate = 1;
  public function requestCalc($product,$service)
  {
    $this->product = $product;
    $this->service = $service;
    $this->euro = $this->product + $this->service;
    return $this->requestTotal();
  }
  public function requestTotal()
  {
    $this->euro *= $this->rate;
    return $this->euro;
  }
}
//欧元适配器接口
interface ITarget
{
  function requester();
}
//欧元适配器实现
class EuroAdapter extends EuroCalc implements ITarget
{
  public function __construct()
  {
    $this->requester();
  }
  function requester()
  {
    $this->rate = .8111;
    return $this->rate;
  }
}
//客户类
class Client
{
  private $euroRequest;
  private $dollarRequest;
  public function __construct()
  {
    $this->euroRequest = new EuroAdapter();
    $this->dollarRequest = new DollarCalc();
    $euro = "€";
    echo "Euros: $euro" . $this->makeAdapterRequest($this->euroRequest) . "<br />";
    echo "Dollars: $" . $this->makeDollarRequest($this->dollarRequest);
  }
  private function makeAdapterRequest(ITarget $req)
  {
    return $req->requestCalc(40,50);
  }
  private function makeDollarRequest(DollarCalc $req)
  {
    return $req->requestCalc(40,50);
  }
}
$client = new Client();
?>

<?php
/**
*  对象适配器模式
*         从桌面环境转向移动环境
**/
//桌面布局接口
interface IFormat
{
  public function formatCSS();
  public function formatGraphics();
  public function horizontalLayout();
}
//桌面布局类实现
class Desktop implements IFormat
{
  public function formatCSS()
  {
    //调用桌面布局CSS文件
  }
  public function formatGraphics()
  {
    //调用图片
  }
  public function horizontalLayout()
  {
    //桌面水平布局
  }
}
//移动布局接口
interface IMobileFormat
{
  public function formatCSS();
  public function formatGraphics();
  public function verticalLayout();
}
//移动布局类实现
class Mobile implements IMobileFormat
{
  public function formatCSS()
  {
    //调用移动布局CSS文件
  }
  public function formatGraphics()
  {
    //调用图片
  }
  public function verticalLayout()
  {
    //移动垂直布局
  }
}
//移动布局适配器
class MobileAdapter implements IFormat
{
  private $mobile;
  public function __construct(IMobileFormat $mobile)
  {
    $this->mobile = $mobile;
  }
  public function formatCSS()
  {
    $this->mobile->formatCSS();
  }
  public function formatGraphics()
  {
    $this->mobile->formatGraphics();
  }
  public function horizontalLayout()
  {
    $this->mobile->verticalLayout();
  }
}
//客户类
class Client
{
  private $mobile;
  private $mobileAdapter;
  public function __construct()
  {
    $this->mobile = new Mobile();
    $this->mobileAdapter = new MobileAdapter($this->mobile);
    $this->mobileAdapter->formatCSS();
    $this->mobileAdapter->formatGraphics();
    $this->mobileAdapter->horizontalLayout();
  }
}
$client = new Client();
?>