PHP设计模式入门之状态模式原理与实现方法分析(3)

<?php
require_once 'State.php';
 
class HasmoneyState implements State
{
 
  /**
   * 饮料机的实例
   *
   * @var object
   */
  private $_juiceMachine;
 
  /**
   * 构造方法，主要用于初始化饮料机实例
   */
  public function __construct($juiceMachine)
  {
    $this->_juiceMachine = $juiceMachine;
  }
  
  /*
   * (non-PHPdoc) @see State::insertCoin()
   */
  public function insertCoin()
  {
    // TODO Auto-generated method stub
    echo "you can't insert another coin!<br />";
  }
  
  /*
   * (non-PHPdoc) @see State::retreatCoin()
   */
  public function retreatCoin()
  {
    // TODO Auto-generated method stub
    echo "coin return!<br />";
    $this->_juiceMachine->setState($this->_juiceMachine->getNomoneyState());
  }
  
  /*
   * (non-PHPdoc) @see State::clickButton()
   */
  public function clickButton()
  {
    // TODO Auto-generated method stub
    echo "you clicked, we are giving you a bottle of juice...<br />";
    // 改变饮料机的状态为售出模式
    $rand = mt_rand(0, 0);
    // 当随机数为0（即1/10的概率）并且饮料机中还有1瓶以上的饮料时
    if ($rand == 0 && $this->_juiceMachine->getCount() > 1) {
      $this->_juiceMachine->setState($this->_juiceMachine->getWinnerState());
    } else {
      $this->_juiceMachine->setState($this->_juiceMachine->getSoldState());
    }
  }
  
  /*
   * (non-PHPdoc) @see State::dispend()
   */
  public function dispend()
  {
    // TODO Auto-generated method stub
    echo "please click the button first<br />";
  }
}

<?php
require_once 'State.php';
class SoldoutState implements State{
  
  /**
   * 饮料机的实例
   *
   * @var object
   */
  private $_juiceMachine;
  
  /**
   * 构造方法，主要用于初始化饮料机实例
   *
   */
  public function __construct($juiceMachine){
    $this->_juiceMachine = $juiceMachine;
  }
  
 /* (non-PHPdoc)
   * @see State::insertCoin()
   */
  public function insertCoin()
  {
    // TODO Auto-generated method stub
    echo "you can't insert coin, the machine is already soldout<br />";
  }
 
 /* (non-PHPdoc)
   * @see State::retreatCoin()
   */
  public function retreatCoin()
  {
    // TODO Auto-generated method stub
    echo "you have'nt inserted a coin yet<br />";
  }
 
 /* (non-PHPdoc)
   * @see State::clickButton()
   */
  public function clickButton()
  {
    // TODO Auto-generated method stub
    echo "you clicked, but the machine is already soldout<br />";
  }
 
 /* (non-PHPdoc)
   * @see State::dispend()
   */
  public function dispend()
  {
    // TODO Auto-generated method stub
    echo "opps, it appears that we don't have any juice left<br />";
  }
}

<?php
require_once 'State.php';
class SoldState implements State{
  
  /**
   * 饮料机的实例
   *
   * @var object
   */
  private $_juiceMachine;
  
  /**
   * 构造方法，主要用于初始化饮料机实例
   *
   */
  public function __construct($juiceMachine){
    $this->_juiceMachine = $juiceMachine;
  }
  
 /* (non-PHPdoc)
   * @see State::insertCoin()
   */
  public function insertCoin()
  {
    // TODO Auto-generated method stub
    echo "wait a minute, we are giving you a bottle of juice<br />";
  }
 
 /* (non-PHPdoc)
   * @see State::retreatCoin()
   */
  public function retreatCoin()
  {
    // TODO Auto-generated method stub
    echo "sorry, you already clicked the botton<br />";
  }
 
 /* (non-PHPdoc)
   * @see State::clickButton()
   */
  public function clickButton()
  {
    // TODO Auto-generated method stub
    echo "click twice does'nt get you two bottle of juice<br />";
  }
 
 /* (non-PHPdoc)
   * @see State::dispend()
   */
  public function dispend()
  {
    $this->_juiceMachine->decJuice();
    if($this->_juiceMachine->getCount() <= 0){
      echo "opps, runing out of juice<br />";
      //如果这时饮料机中没有饮料了，将饮料机的状态重置为销售一空
       $this->_juiceMachine->setState($this->_juiceMachine->getSoldoutState());
    }else{
      //将饮料机的状态重置为没有钱
       $this->_juiceMachine->setState($this->_juiceMachine->getNomoneyState());
    }
  }
  
}