<?php /** * TDummyDataSource, TDummyDataSourceIterator classes * * @author Qiang Xue <qiang.xue@gmail.com> * @link http://www.pradosoft.com/ * @copyright Copyright © 2005-2011 PradoSoft * @license http://www.pradosoft.com/license/ * @version $Id$ * @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> * @version $Id$ * @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> * @version $Id$ * @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; } }