PHP设计模式之：工厂模式

浏览数：133 / 时间：2015年06月09日

<?php
abstract class Operation
{
   public numA = 0;
   public numB = 0;

   public function __construct($numA, $numB)
   {
       $this->numA = $numA;
       $this->numB = $numB;
   }
   abstract function getResult();
}

class OperationAdd extends Operation
{
   public function getResult()
   {
       return numA+numB;
   }
}

class OperationSub extends Operation
{
   public function getResult()
   {
       return numA - numB;
   }
}

class OperationMul extends Operation
{
   public function getResult()
   {
       return numA * numB;
   }
}

class OperationDiv extends Operation
{
   public function getResult()
   {
       if(numB == 0)
       {
           throw new Exception("除数不能为 0 。");
       }
       return (double) (numA / numB);
   }
}

/** *************************************** */
// 简单运算工厂类
class OperationFactory
{
   public static createOperate($operation, $numA, $numB)
   {
       switch($operation)
       {
           case ‘+‘:
               $oper = new OperationAdd($numA, $numB);
               break;
           case ‘-‘:
               $oper = new OperationSub($numA, $numB);
               break;
           case ‘*‘:
               $oper = new OperationMul($numA, $numB);
               break;
           case ‘/‘:
               $oper = new OperationDiv($numA, $numB);
               break;
       }
       return $oper;
   }

}

/** ************************ */
// 调用方式
$numA = 100;
$numB = 8;
$operation = ‘+‘;
$oper = OperationFactory::createOperate($operation, $numA, $numB);
echo $oper.getResult();