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<?php
/**
* TSqlMapPagedList class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2008 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Data.SqlMap
*/
Prado::using('System.Collections.TPagedList');
/**
* TSqlMapPagedList implements a list with paging functionality that retrieves
* data from a SqlMap statement.
*
* The maximum number of records fetched is 3 times the page size. It fetches
* the current, the previous and the next page at a time. This allows the paged
* list to determine if the page is a the begin, the middle or the end of the list.
*
* The paged list does not need to know about the total number of records.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Id$
* @package System.Data.SqlMap
* @since 3.1
*/
class TSqlMapPagedList extends TPagedList
{
private $_statement;
private $_parameter;
private $_prevPageList;
private $_nextPageList;
private $_delegate=null;
/**
* Create a new SqlMap paged list.
* @param IMappedStatement SqlMap statement.
* @param mixed query parameters
* @param int page size
* @param mixed delegate for each data row retrieved.
* @param int number of page to fetch on initialization
*/
public function __construct(IMappedStatement $statement,$parameter, $pageSize, $delegate=null, $page=0)
{
parent::__construct();
parent::setCustomPaging(true);
$this->initialize($statement,$parameter, $pageSize, $page);
$this->_delegate=$delegate;
}
/**
* Initialize the paged list.
* @param IMappedStatement SqlMap statement.
* @param mixed query parameters
* @param int page size.
* @param int number of page.
*/
protected function initialize($statement, $parameter, $pageSize, $page)
{
$this->_statement = $statement;
$this->_parameter = $parameter;
$this->setPageSize($pageSize);
$this->attachEventHandler('OnFetchData', array($this, 'fetchDataFromStatement'));
$this->gotoPage($page);
}
/**
* @throws TSqlMapException custom paging must be enabled.
*/
public function setCustomPaging($value)
{
throw new TSqlMapException('sqlmap_must_enable_custom_paging');
}
/**
* Fetch data by executing the SqlMap statement.
* @param TPageList current object.
* @param TPagedListFetchDataEventParameter fetch parameters
*/
protected function fetchDataFromStatement($sender, $param)
{
$limit = $this->getOffsetAndLimit($param);
$connection = $this->_statement->getManager()->getDbConnection();
$data = $this->_statement->executeQueryForList($connection,
$this->_parameter, null, $limit[0], $limit[1], $this->_delegate);
$this->populateData($param, $data);
}
/**
* Switches to the next page.
* @return integer|boolean the new page index, false if next page is not availabe.
*/
public function nextPage()
{
return $this->getIsNextPageAvailable() ? parent::nextPage() : false;
}
/**
* Switches to the previous page.
* @return integer|boolean the new page index, false if previous page is not availabe.
*/
public function previousPage()
{
return $this->getIsPreviousPageAvailable() ? parent::previousPage() : false;
}
/**
* Populate the list with the fetched data.
* @param TPagedListFetchDataEventParameter fetch parameters
* @param array fetched data.
*/
protected function populateData($param, $data)
{
$total = $data instanceof TList ? $data->getCount() : count($data);
$pageSize = $this->getPageSize();
if($total < 1)
{
$param->setData($data);
$this->_prevPageList = null;
$this->_nextPageList = null;
return;
}
if($param->getNewPageIndex() < 1)
{
$this->_prevPageList = null;
if($total <= $pageSize)
{
$param->setData($data);
$this->_nextPageList = null;
}
else
{
$param->setData(array_slice($data, 0, $pageSize));
$this->_nextPageList = array_slice($data, $pageSize-1,$total);
}
}
else
{
if($total <= $pageSize)
{
$this->_prevPageList = array_slice($data, 0, $total);
$param->setData(array());
$this->_nextPageList = null;
}
else if($total <= $pageSize*2)
{
$this->_prevPageList = array_slice($data, 0, $pageSize);
$param->setData(array_slice($data, $pageSize, $total));
$this->_nextPageList = null;
}
else
{
$this->_prevPageList = array_slice($data, 0, $pageSize);
$param->setData(array_slice($data, $pageSize, $pageSize));
$this->_nextPageList = array_slice($data, $pageSize*2, $total-$pageSize*2);
}
}
}
/**
* Calculate the data fetch offsets and limits.
* @param TPagedListFetchDataEventParameter fetch parameters
* @return array 1st element is the offset, 2nd element is the limit.
*/
protected function getOffsetAndLimit($param)
{
$index = $param->getNewPageIndex();
$pageSize = $this->getPageSize();
return $index < 1 ? array($index, $pageSize*2) : array(($index-1)*$pageSize, $pageSize*3);
}
/**
* @return boolean true if the next page is available, false otherwise.
*/
public function getIsNextPageAvailable()
{
return !is_null($this->_nextPageList);
}
/**
* @return boolean true if the previous page is available, false otherwise.
*/
public function getIsPreviousPageAvailable()
{
return !is_null($this->_prevPageList);
}
/**
* @return boolean true if is the very last page, false otherwise.
*/
public function getIsLastPage()
{
return is_null($this->_nextPageList) || $this->_nextPageList->getCount() < 1;
}
/**
* @return boolean true if is not first nor last page, false otherwise.
*/
public function getIsMiddlePage()
{
return !($this->getIsFirstPage() || $this->getIsLastPage());
}
}
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