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