classCollection

classCollection

<?php

/**
 * 
 * 物件集合處理
 * @author Cheng-Ting
 *
 */
class Collection
{
	private $object;
	
	public function __construct(){}
	
	/**
	 * 
	 * 新增物件到集合裡面
	 * @param Object $object
	 * @param Mixed $key
	 * @throws Exception
	 */
	public function addItem($object, $key = NULL)
	{
		if(!is_object($object)) throw new Exception('it not object');
		if(!is_null($key) && !array_key_exists($key, $this->object))
		{
			$this->object[$key] = $object;
		}else{
			$this->object[] = $object;
		}
	}
	
	/**
	 * 
	 * 刪除集合裡面的物件
	 * @param Mixed $key
	 * @throws Exception
	 */
	public function removeItem($key = NULL)
	{
		if(!is_null($key) && array_key_exists($key, $this->object))
		{
			unset($this->object[$key]);
		}else{
			throw new Exception('not search $key');
		}
	}
	
	/**
	 * 
	 * 取得集合裡面的物件
	 * @param Mixed $key
	 * @throws Exception
	 */
	public function getItem($key = NULL)
	{
		if(!is_null($key) && array_key_exists($key, $this->object))
		{
			return $this->object[$key];
		}else{
			throw new Exception('not search '.$key);
		}
	}
	
	/**
	 * 
	 * 取得內部所有集合物件
	 * @return Array
	 */
	public function __toString()
	{
		var_dump($this->object);
	}
	
	/**
	 * 
	 * 取回集合物件的 索引
	 * @return Array
	 */
	public function keys()
	{
		return array_keys($this->object);
	}
}


/**
 * 
 * 實作物件 foreach 功能
 * @author Cheng-Ting
 *
 */
class cIterator implements Iterator
{
	private $array;
	private $collection;
	private $index = 0;
	
	/**
	 * 
	 * 建立 Iterator 處理
	 * @param Collection $object
	 */
	public function __construct(Collection $object)
	{
		$this->array = $object->keys();
		$this->collection = $object;
	}
	
	/**
	 * 
	 * 重新設定物件集合
	 * @param String $name
	 * @param Collection $value
	 */
	public function __set($name, Collection $value)
	{
		if($name == 'collection')
		{
			$this->collection = $value;
			$this->array = $value->keys();
		}
	}
	
	public function rewind()
	{
		$this->index = 0;
	}
	
	public function next()
	{
		$this->index++;
	}
	
	public function key()
	{
		return $this->array[$this->index];
	}
	
	public function current()
	{
		return $this->collection->getItem($this->array[$this->index]);
	}
	
	public function valid()
	{
		return isset($this->array[$this->index]);
	}
	
}

/**
 * 
 * 書物件 範例
 * @author Cheng-Ting
 *
 */
class book
{
	private $title;
	
	public function __construct($title)
	{
		$this->title = $title;
	}
	
	public function __toString()
	{
		echo $this->title;
	}
}



/*
 * 以下為使用範例
 */
try {
	
	$collcection = new Collection();
	
	$data = array('PHP','Mysql','Linux','JS','as');
	foreach($data as $row)
	{
		$collcection->addItem(new book($row));	//建立物件到集合裡面
	}
	$collcection->addItem(new book('ok'), 'ok');	//建立物件到集合裡面使用自訂索引
	
	$iterator = new cIterator($collcection);
	
	foreach($iterator as $key => $values)	//使用foreach方式取回整個集合物件
	{
		var_dump($values);
	}
	
	
} catch (Exception $e) {
	echo $e->getMessage();
}