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<?php
/*
* $Id$
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.doctrine-project.org>.
*/
/**
* Doctrine_Pager_Range_Sliding
*
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @package Doctrine
* @subpackage Pager
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @version $Revision$
* @link www.doctrine-project.org
* @since 0.9
*/
class Doctrine_Pager_Range_Sliding extends Doctrine_Pager_Range
{
/**
* @var int $_chunkLength Chunk length to be returned
*/
private $_chunkLength;
/**
* _initialize
*
* Initialize Doctrine_Pager_Range_Sliding and does custom assignments
*
* @return void
*/
protected function _initialize()
{
if (isset($this->_options['chunk'])) {
$this->_setChunkLength($this->_options['chunk']);
} else {
throw new Doctrine_Pager_Exception('Missing parameter \'chunk\' that must be defined in options.');
}
}
/**
* getChunkLength
*
* Returns the size of the chunk defined
*
* @return int Chunk length
*/
public function getChunkLength()
{
return $this->_chunkLength;
}
/**
* _setChunkLength
*
* Defines the size of the chunk
*
* @param $chunkLength Chunk length
* @return void
*/
protected function _setChunkLength($chunkLength)
{
$chunkLength = (int) $chunkLength;
if ( !$chunkLength) {
$chunkLength = 1;
} else {
$this->_chunkLength = $chunkLength;
}
}
/**
* rangeAroundPage
*
* Calculate and returns an array representing the range around the current page
*
* @return array
*/
public function rangeAroundPage()
{
$pager = $this->getPager();
if ($pager->getExecuted()) {
$page = $pager->getPage();
$pages = $pager->getLastPage();
$chunk = $this->getChunkLength();
if ($chunk > $pages) {
$chunk = $pages;
}
$chunkStart = $page - (floor($chunk / 2));
$chunkEnd = $page + (ceil($chunk / 2)-1);
if ($chunkStart < 1) {
$adjust = 1 - $chunkStart;
$chunkStart = 1;
$chunkEnd = $chunkEnd + $adjust;
}
if ($chunkEnd > $pages) {
$adjust = $chunkEnd - $pages;
$chunkStart = $chunkStart - $adjust;
$chunkEnd = $pages;
}
return range($chunkStart, $chunkEnd);
}
throw new Doctrine_Pager_Exception(
'Cannot retrieve the range around the page of a not yet executed Pager query'
);
}
}
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