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星际争霸之php抽象工厂模式

Jun 07, 2016 pm 05:23 PM
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星际争霸是战略游戏,所以同样的兵种,敌我显示是不同的。


典型的就是鼠标的颜色,点中自己的物体的时候,鼠标颜色变成绿色,点中敌人的物体的时候,鼠标颜色变成红色。


还有就是每个物体的状态,点中自己的物体的时候,状态区显示完整的状态,点中敌人的物体的时候,状态区显示一部分信息。


我们假设只考虑鼠标和人族的运输船,玩家自己的运输船点中后状态区会显示里面装载的部队,而点中敌人的则不会显示里面是否装载部队。


这样我们就有四种对象:点中自己的鼠标,点中敌人的鼠标,自己的运输船状态,敌人的运输船状态。


如果用工厂方法模式,就要建立四个具体工厂(或者子工厂),这样的代码不便于维护和修改,因为我们以后要增加另一种情况:盟友。


待解决的问题:我们希望将这些对象联系起来,使得工厂的操作更加有逻辑性。


思路:既然我们通过自己和敌人来区分对象,那么统一归属的对象放入相同的具体工厂,每个具体工厂负责制造多种对象。



抽象工厂模式示例:

<?php

//四个产品类

//点中自己的物体时的鼠标

class mineMouse {

//鼠标的颜色

$color = &#39;green&#39;;

}

//点中敌人的物体时的鼠标

class enemyMouse {

//鼠标的颜色

$color = &#39;red&#39;;

}

//自己的运输船状态

class mineDropship {

//显示装载的情况,假设2辆坦克

$loading = &#39;2 tanks&#39;;

}

//敌人的运输船状态

class enemyDropship {

//不显示装载的情况

$loading = &#39;&#39;;

}

//主工厂类,也叫抽象工厂类

class abstractCreator {

    //根据参数分配工作到具体的工厂,并返回具体工厂对象

  public function getCreator($belong)

  {

    //获取具体工厂的类名

    $creatorClassName = $belong.&#39;Creator&#39;;

    //返回具体工厂对象

    return new $creatorClassName();

  }

}

//具体工厂必须执行的接口

interface productCreator {

//制造方法,或者说根据参数返回产品(鼠标,运输船)的方法

public function creatProduct($productName);

}

//制造属于自己的物体的具体工厂,执行接口

class mineCreator implements productCreator {

    //根据参数生产并返回属于自己的产品

  public function creatProduct($productName)

  {

    //获取产品的类名

    $productClassName = &#39;mine&#39;.$productName;

    //返回产品对象

    return new $productClassName;

  }

}

//制造属于敌人的物体的具体工厂,执行接口

class enemyCreator implements productCreator {

    //根据参数生产并返回属于敌人的产品

  public function creatProduct($productName)

  {

    //获取产品的类名

    $productClassName = &#39;enemy&#39;.$productName;

    //返回产品对象

    return new $productClassName;

  }

}

//开始操作

//新建抽象工厂对象

$abstractCreator = new abstractCreator();

//根据归属,得到具体工厂对象,这里先演示敌人的

$realCreator1 = $abstractCreator->getCreator(&#39;enemy&#39;);

//让具体工厂对象生产鼠标对象

$product1 = $realCreator1->creatProduct(&#39;Mouse&#39;);

//让鼠标对象显示颜色,显示结果red

echo $product1->color;

//根据归属,得到另一个具体工厂对象,这里演示自己的

$realCreator2 = $abstractCreator->getCreator(&#39;mine&#39;);

//让具体工厂对象生产运输船

$product2 = $realCreator2->creatProduct(&#39;Dropship&#39;);

//让运输船对象显示装载对象,显示结果2 tanks,两辆坦克 

echo $product2->loading;

?>
Copy after login

用途总结:抽象工厂模式将拥有相同属性的产品归类到同一个具体工厂,减少具体工厂的数量,操作的时候,可以理清职责。


实现总结:需要一个根据属性返回具体工厂对象的抽象工厂,比如上面abstractCreator,同时需要将各个产品的属性(自己的,敌人的)进行归类,根据属性建立各个具体工厂,每个具体工厂制造多个具有相同属性的不同产品(鼠标和运输船)。


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