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<?php
/**
* TDummyDataSource, TDummyDataSourceIterator classes
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link https://github.com/pradosoft/prado
* @copyright Copyright © 2005-2016 The PRADO Group
* @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
* @package System.Collections
*/
/**
* TDummyDataSource class
*
* TDummyDataSource implements a dummy data collection with a specified number
* of dummy data items. The number of virtual items can be set via
* {@link setCount Count} property. You can traverse it using <b>foreach</b>
* PHP statement like the following,
* <code>
* foreach($dummyDataSource as $dataItem)
* </code>
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package System.Collections
* @since 3.0
*/
class TDummyDataSource extends TComponent implements IteratorAggregate, Countable
{
private $_count;
/**
* Constructor.
* @param integer number of (virtual) items in the data source.
*/
public function __construct($count)
{
$this->_count=$count;
}
/**
* @return integer number of (virtual) items in the data source.
*/
public function getCount()
{
return $this->_count;
}
/**
* @return Iterator iterator
*/
public function getIterator()
{
return new TDummyDataSourceIterator($this->_count);
}
/**
* Returns the number of (virtual) items in the data source.
* This method is required by Countable interface.
* @return integer number of (virtual) items in the data source.
*/
public function count()
{
return $this->getCount();
}
}
/**
* TDummyDataSourceIterator class
*
* TDummyDataSourceIterator implements Iterator interface.
*
* TDummyDataSourceIterator is used by {@link TDummyDataSource}.
* It allows TDummyDataSource to return a new iterator
* for traversing its dummy items.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package System.Collections
* @since 3.0
*/
class TDummyDataSourceIterator implements Iterator
{
private $_index;
private $_count;
/**
* Constructor.
* @param integer number of (virtual) items in the data source.
*/
public function __construct($count)
{
$this->_count=$count;
$this->_index=0;
}
/**
* Rewinds internal array pointer.
* This method is required by the interface Iterator.
*/
public function rewind()
{
$this->_index=0;
}
/**
* Returns the key of the current array item.
* This method is required by the interface Iterator.
* @return integer the key of the current array item
*/
public function key()
{
return $this->_index;
}
/**
* Returns the current array item.
* This method is required by the interface Iterator.
* @return mixed the current array item
*/
public function current()
{
return null;
}
/**
* Moves the internal pointer to the next array item.
* This method is required by the interface Iterator.
*/
public function next()
{
$this->_index++;
}
/**
* Returns whether there is an item at current position.
* This method is required by the interface Iterator.
* @return boolean
*/
public function valid()
{
return $this->_index<$this->_count;
}
}
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