PHP面向对象程序设计之对象生成方法详解

output:

MegaCal header
Appointment data encoded in MegaCal format
MegaCal footer

更加牛逼的实现

<?php
// 根据类图，规划类的代码。从大局入手。
abstract class ApptEncoder {
  abstract function encode();
}
class BloggsApptEncoder extends ApptEncoder {
  function encode() {
    return "Appointment data encoded in BloggsCal formatn";
  }
}
class MegaApptEncoder extends ApptEncoder {
  function encode() {
    return "Appointment data encoded in MegaCal formatn";
  }
}
abstract class CommsManager {
  const APPT  = 1;
  const TTD   = 2;
  const CONTACT = 3;
  abstract function getHeaderText();
  abstract function make( $flag_int ); // int标记
  abstract function getFooterText();
}
class BloggsCommsManager extends CommsManager {
  function getHeaderText() {
    return "BloggsCal headern";
  }
  function make( $flag_int ) {
    switch ( $flag_int ) {
      case self::APPT: // self直接控制常量
        return new BloggsApptEncoder();
      case self::CONTACT:
        return new BloggsContactEncoder();
      case self::TTD:
        return new BloggsTtdEncoder();
    }
  }
  function getFooterText() {
    return "BloggsCal footern";
  }
}
$mgr = new BloggsCommsManager();
print $mgr->getHeaderText();
print $mgr->make( CommsManager::APPT )->encode();
print $mgr->getFooterText();
?>

output:

BloggsCal header
Appointment data encoded in BloggsCal format
BloggsCal footer

原型模式

改造成一个保存具体产品的工厂类。

<?php
class Sea {} // 大海
class EarthSea extends Sea {}
class MarsSea extends Sea {}
class Plains {} // 平原
class EarthPlains extends Plains {}
class MarsPlains extends Plains {}
class Forest {} // 森林
class EarthForest extends Forest {}
class MarsForest extends Forest {}
class TerrainFactory { // 地域工厂
  private $sea;
  private $forest;
  private $plains;
  function __construct( Sea $sea, Plains $plains, Forest $forest ) { // 定义变量为类对象
    $this->sea = $sea;
    $this->plains = $plains;
    $this->forest = $forest;
  }
  function getSea( ) {
    return clone $this->sea; // 克隆
  }
  function getPlains( ) {
    return clone $this->plains;
  }
  function getForest( ) {
    return clone $this->forest;
  }
}
$factory = new TerrainFactory( new EarthSea(),
  new EarthPlains(),
  new EarthForest() );
print_r( $factory->getSea() );
print_r( $factory->getPlains() );
print_r( $factory->getForest() );
?>

output:

EarthSea Object
(
)
EarthPlains Object
(
)
EarthForest Object
(
)

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