星际争霸之php迭代器模式
星际的任务关一般会有这样的设定:一开始电脑的农民不采矿,如果战斗打响,或者玩家造出第一个兵,电脑的农民开始采矿。
我们自然会想到把电脑的农民放到一个数组,然后一旦玩家造兵,或者战斗打响,把这个数组循环,让里面的农民采矿。
但问题出来了,由于每个任务的设定会有所不同,我们总希望任务的开发比较方便,而且容易修改(一旦发现bug)。
何况有些任务不是农民采矿,而是电脑出兵攻击玩家。
那么过多的固定细节(用数组存放)以及依赖细节(对数组循环),将使得代码的关联性变得很高。
待解决的问题:把循环处理的事务变的抽象。
思路:关键是对农民的循环,用数组处理只是一种方式,我们考虑抽象的数组,而不是具体的数组。
迭代器(Iterator)模式示例:
<?php //聚集接口,意思是所有电脑的农民都聚集在这个类里面 interface IAggregate { //让具体的聚集类实现的,获取使用的迭代器的方法 public function createIterator(); } //具体的聚集类 class ConcreteAggregate implements IAggregate { //存放农民的数组,注意可以不用数组来处理,看完所有的代码就知道了 public $workers; //增加元素的方法,这里元素就是农民 public function addElement($element) { $this->workers[] = $element; } //获取元素的方法 public function getAt($index) { return $this->workers[$index]; } //获取元素的数量的方法 public function getLength() { return count($this->workers); } //获取迭代器的方法 public function createIterator() { return new ConcreteIterator($this); } } //迭代器接口,注意php5有个内置的接口叫Iterator,所以这里我们改成IIterator interface IIterator { //是否元素循环完毕 public function hasNext(); //返回下一个元素,并将指针加1 public function next(); } //具体的迭代器类 class ConcreteIterator implements IIterator { //要迭代的集合 public $collection; //指针 public $index; //构造函数,确定迭代的集合,并将指针置零 public function

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