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Revision Autor Zeilennr. Zeile
1 lars 1 
<?php
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/**
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 * TDummyDataSource, TDummyDataSourceIterator classes
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 *
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 * @author Qiang Xue <qiang.xue@gmail.com>
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 * @link http://www.pradosoft.com/
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 * @copyright Copyright &copy; 2005-2008 PradoSoft
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 * @license http://www.pradosoft.com/license/
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 * @version $Id: TDummyDataSource.php 2541 2008-10-21 15:05:13Z qiang.xue $
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 * @package System.Collections
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 */
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/**
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 * TDummyDataSource class
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 *
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 * TDummyDataSource implements a dummy data collection with a specified number
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 * of dummy data items. The number of virtual items can be set via
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 * {@link setCount Count} property. You can traverse it using <b>foreach</b>
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 * PHP statement like the following,
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 * <code>
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 * foreach($dummyDataSource as $dataItem)
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 * </code>
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 *
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 * @author Qiang Xue <qiang.xue@gmail.com>
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 * @version $Id: TDummyDataSource.php 2541 2008-10-21 15:05:13Z qiang.xue $
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 * @package System.Collections
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 * @since 3.0
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 */
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class TDummyDataSource extends TComponent implements IteratorAggregate, Countable
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{
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	private $_count;
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	/**
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	 * Constructor.
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	 * @param integer number of (virtual) items in the data source.
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	 */
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	public function __construct($count)
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	{
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		$this->_count=$count;
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	}
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	/**
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	 * @return integer number of (virtual) items in the data source.
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	 */
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	public function getCount()
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	{
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		return $this->_count;
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	}
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	/**
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	 * @return Iterator iterator
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	 */
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	public function getIterator()
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	{
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		return new TDummyDataSourceIterator($this->_count);
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	}
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	/**
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	 * Returns the number of (virtual) items in the data source.
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	 * This method is required by Countable interface.
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	 * @return integer number of (virtual) items in the data source.
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	 */
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	public function count()
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	{
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		return $this->getCount();
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	}
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}
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/**
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 * TDummyDataSourceIterator class
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 *
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 * TDummyDataSourceIterator implements Iterator interface.
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 *
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 * TDummyDataSourceIterator is used by {@link TDummyDataSource}.
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 * It allows TDummyDataSource to return a new iterator
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 * for traversing its dummy items.
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 *
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 * @author Qiang Xue <qiang.xue@gmail.com>
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 * @version $Id: TDummyDataSource.php 2541 2008-10-21 15:05:13Z qiang.xue $
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 * @package System.Collections
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 * @since 3.0
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 */
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class TDummyDataSourceIterator implements Iterator
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{
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	private $_index;
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	private $_count;
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	/**
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	 * Constructor.
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	 * @param integer number of (virtual) items in the data source.
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	 */
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	public function __construct($count)
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	{
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		$this->_count=$count;
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		$this->_index=0;
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	}
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	/**
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	 * Rewinds internal array pointer.
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	 * This method is required by the interface Iterator.
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	 */
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	public function rewind()
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	{
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		$this->_index=0;
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	}
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	/**
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	 * Returns the key of the current array item.
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	 * This method is required by the interface Iterator.
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	 * @return integer the key of the current array item
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	 */
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	public function key()
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	{
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		return $this->_index;
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	}
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	/**
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	 * Returns the current array item.
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	 * This method is required by the interface Iterator.
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	 * @return mixed the current array item
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	 */
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	public function current()
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	{
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		return null;
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	}
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	/**
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	 * Moves the internal pointer to the next array item.
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	 * This method is required by the interface Iterator.
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	 */
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	public function next()
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	{
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		$this->_index++;
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	}
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	/**
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	 * Returns whether there is an item at current position.
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	 * This method is required by the interface Iterator.
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	 * @return boolean
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	 */
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	public function valid()
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	{
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		return $this->_index<$this->_count;
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	}
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}
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