php设计模式之简单工厂模式详解

• 虚拟产品接口类
• 定义好需要实现的方法
  */

interface fruit{

/**

• 生长
  */
  public function grow();

/**

• 种植
  */
  public function plant();

/**

• 收获
  */
  public function harvest();

/**

• 吃
  */
  public function eat();

}

/**

• 定义具体产品类 苹果
• 首先，我们要实现所继承的接口所定义的方法
• 然后定义苹果所特有的属性，以及方法
  */
  class apple implements fruit{

//苹果树有年龄
private $treeAge;

//苹果有颜色
private $color;

public function grow(){
echo "grape grow";
}

public function plant(){
echo "grape plant";
}

public function harvest(){
echo "grape harvest";
}

public function eat(){
echo "grape eat";
}

//取苹果树的年龄
public function getTreeAge(){
return $this->treeAge;
}

//设置苹果树的年龄
public function setTreeAge($age){
$this->treeAge = $age;
return trie;
}

}

/**

• 定义具体产品类 葡萄
• 首先，我们要实现所继承的接口所定义的方法
• 然后定义葡萄所特有的属性，以及方法
  */
  class grape implements fruit{

//葡萄是否有籽
private $seedLess;

public function grow(){
echo "apple grow";
}

public function plant(){
echo "apple plant";
}

public function harvest(){
echo "apple harvest";
}

public function eat(){
echo "apple eat";
}

//有无籽取值
public function getSeedLess(){
return $this->seedLess;
}

//设置有籽无籽
public function setSeedLess($seed){
$this->seedLess = $seed;
return true;
}
}

/*
农场主类 用来获取实例化的水果

• */
  class farmer{

//定义个静态工厂方法
public static function factory($fruitName){
switch ($fruitName) {
case 'apple':
return new apple();
break;
case 'grape':
return new grape();
break;
default:
throw new badFruitException("Error no the fruit",1);
break;
}
}
}

class badFruitException extends Exception{
public $msg;
public $errType;
public function __construct($msg = '',$errType = 1){
$this->msg = $msg;
$this->errType = $errType;
}
}

/**

• 获取水果实例化的方法
  */
  try{
  $appleInstance = farmer::factory('apple');
  var_dump($appleInstance);
  }catch(badFruitException $err){
  echo $err->msg . "___" . $err->errType;
  }