<?php
/**

 * @Iterator功能演示

 * @author   张宇  2006-5-16

 * @version  1.0

 */

 

 interface i_Aggregate  //集合类
 {
     function iterator(); //Iterator`э
   }
   
   interface i_Iterator
   {
     function hasNext(); //boolean类型
     function next(); //Object类型
   }
   
   class Student
 {
    private $name;
  private $sex; //男:1  女:2
 
  public function Student($pName,$pSex) //构造函数
  {
   $this->name = $pName;
   $this->sex = $pSex;
  }
  
  public function getName() //取得姓名
  {
   return $this->name;
  }
  
  public function getSex() //取得性别
  {
   return $this->sex;
  }
 }
 
 class StudentList
 {
  protected $students;  //Student[] students;
  private   $last = 0;
  
  public function StudentList($pStudentCount) //构造函数-指定学生的个数
  {
   $this->students = array($pStudentCount);
  }
 
  public function add(Student $pStudent) //增加一个学生
  {
   $this->students[$this->last] = $pStudent;
   $this->last++;
  }
  
  public function getStudentAt($pIndex)  //返回某个位置的学生
  {
   return $this->students[$pIndex];
  }
  
  public function getLastNum()  //返回学生的数目
  {
   return $this->last;
  }
 }
 
   class MyStudentList extends StudentList implements i_Aggregate
   {
  public function iterator() //Iterator类型
  {
   return new MyStudentListIterator($this);
  }
 }
 
 class MyStudentListIterator implements i_Iterator
 {
  private $myStudentList; //MyStudentList类型
  private $index;
  
  public function MyStudentListIterator(MyStudentList $list)
  {
   $this->myStudentList = $list;
   $this->index = 0;
  }
  
  public function hasNext()
  {
   if($this->myStudentList->getLastNum() > $this->index)
   {
    return true;
   }else {
    return false;
   }
  }
  
  public function next() //Student类型
  {
   $s =  $this->myStudentList->getStudentAt($this->index); //Student类型
   $this->index++;
   return $s;
  }
 }
 
 abstract class Teacher
 {
  protected $sudentList; //StudentList类的实例
  
  public abstract function createStudentList();  //建立一个学生列表
  public abstract function callStudents();  //输出student
 }
 
 class VeteranTeacher extends Teacher
 {
  private $list; //MyStudentList类型
  
  public function createStudentList()
  {
   $this->list = new MyStudentList(6);
   $this->list->add(new Student("张",1));
   $this->list->add(new Student("常",2));
   $this->list->add(new Student("刘",1));
   $this->list->add(new Student("沈",1));
   $this->list->add(new Student("李",2));
   $this->list->add(new Student("蔡",1));
  }
  
  public function callStudents()
  {
   $itr = $this->list->iterator(); //Iterator类型
   while($itr->hasNext())
   {
    echo $itr->next()->getName()."<br>";
   }
  }  
 }
 
 $you = new VeteranTeacher();
 $you->createStudentList();
 $you->callStudents();
?>