534 lines
13 KiB
PHP
534 lines
13 KiB
PHP
<?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.phpdoctrine.org>.
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*/
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/**
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* Doctrine_Pager
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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.phpdoctrine.org
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* @since 0.9
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*/
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class Doctrine_Pager
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{
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/**
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* @var Doctrine_Query $_query Doctrine_Query object related to the pager
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*/
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protected $_query;
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/**
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* @var Doctrine_Query $_countQuery Doctrine_Query object related to the counter of pager
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*/
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protected $_countQuery;
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/**
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* @var array $_countQueryParams Hold the params to be used by Doctrine_Query counter object of pager
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*/
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protected $_countQueryParams;
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/**
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* @var integer $_numResults Number of results found
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*/
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protected $_numResults;
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/**
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* @var integer $_maxPerPage Maximum number of itens per page
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*/
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protected $_maxPerPage;
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/**
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* @var integer $page Current page
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*/
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protected $_page;
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/**
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* @var integer $_lastPage Last page (total of pages)
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*/
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protected $_lastPage;
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/**
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* @var boolean $_executed Pager was initialized (called "execute" at least once)
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*/
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protected $_executed;
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/**
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* __construct
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*
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* @param mixed $query Accepts either a Doctrine_Query object or a string
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* (which does the Doctrine_Query class creation).
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* @param int $page Current page
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* @param int $maxPerPage Maximum itens per page
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* @return void
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*/
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public function __construct($query, $page, $maxPerPage = 0)
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{
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$this->_setExecuted(false);
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$this->_setQuery($query);
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$this->_setPage($page);
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$this->setMaxPerPage($maxPerPage);
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}
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/**
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* _initialize
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*
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* Initialize Pager object calculating number of results
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*
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* @param $params Optional parameters to Doctrine_Query::execute
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* @return void
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*/
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protected function _initialize($params = array())
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{
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// retrieve the number of items found
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$count = $this->getCountQuery()->count($this->getCountQueryParams($params));
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$this->_setNumResults($count);
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$this->_setExecuted(true); // _adjustOffset relies of _executed equals true = getNumResults()
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$this->_adjustOffset();
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}
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/**
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* _adjustOffset
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*
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* Adjusts last page of Doctrine_Pager, offset and limit of Doctrine_Query associated
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*
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* @return void
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*/
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protected function _adjustOffset()
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{
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// Define new total of pages
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$this->_setLastPage(
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max(1, ceil($this->getNumResults() / $this->getMaxPerPage()))
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);
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$offset = ($this->getPage() - 1) * $this->getMaxPerPage();
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// Assign new offset and limit to Doctrine_Query object
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$p = $this->getQuery();
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$p->offset($offset);
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$p->limit($this->getMaxPerPage());
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}
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/**
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* getExecuted
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*
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* Returns the check if Pager was already executed at least once
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*
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* @return boolen Pager was executed
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*/
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public function getExecuted()
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{
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return $this->_executed;
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}
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/**
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* _setExecuted
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*
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* Defines if Pager was already executed
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*
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* @param $executed Pager was executed
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* @return void
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*/
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protected function _setExecuted($executed)
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{
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$this->_executed = $executed;
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}
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/**
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* getNumResults
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*
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* Returns the number of results found
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*
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* @return int the number of results found
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*/
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public function getNumResults()
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{
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if ($this->getExecuted()) {
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return $this->_numResults;
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}
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throw new Doctrine_Pager_Exception(
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'Cannot retrieve the number of results of a not yet executed Pager query'
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);
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}
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/**
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* _setNumResults
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*
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* Defines the number of total results on initial query
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*
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* @param $nb Number of results found on initial query fetch
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* @return void
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*/
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protected function _setNumResults($nb)
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{
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$this->_numResults = $nb;
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}
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/**
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* getFirstPage
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*
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* Returns the first page
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*
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* @return int first page
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*/
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public function getFirstPage()
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{
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return 1;
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}
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/**
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* getLastPage
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*
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* Returns the last page (total of pages)
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*
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* @return int last page (total of pages)
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*/
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public function getLastPage()
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{
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if ($this->getExecuted()) {
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return $this->_lastPage;
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}
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throw new Doctrine_Pager_Exception(
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'Cannot retrieve the last page number of a not yet executed Pager query'
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);
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}
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/**
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* _setLastPage
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*
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* Defines the last page (total of pages)
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*
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* @param $page last page (total of pages)
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* @return void
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*/
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protected function _setLastPage($page)
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{
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$this->_lastPage = $page;
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if ($this->getPage() > $page) {
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$this->_setPage($page);
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}
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}
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/**
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* getLastPage
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*
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* Returns the current page
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*
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* @return int current page
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*/
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public function getPage()
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{
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return $this->_page;
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}
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/**
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* getLastPage
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*
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* Returns the next page
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*
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* @return int next page
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*/
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public function getNextPage()
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{
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if ($this->getExecuted()) {
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return min($this->getPage() + 1, $this->getLastPage());
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}
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throw new Doctrine_Pager_Exception(
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'Cannot retrieve the last page number of a not yet executed Pager query'
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);
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}
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/**
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* getLastPage
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*
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* Returns the previous page
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*
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* @return int previous page
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*/
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public function getPreviousPage()
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{
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if ($this->getExecuted()) {
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return max($this->getPage() - 1, $this->getFirstPage());
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}
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throw new Doctrine_Pager_Exception(
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'Cannot retrieve the previous page number of a not yet executed Pager query'
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);
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}
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/**
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* haveToPaginate
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*
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* Return true if it's necessary to paginate or false if not
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*
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* @return bool true if it is necessary to paginate, false otherwise
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*/
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public function haveToPaginate()
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{
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if ($this->getExecuted()) {
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return $this->getNumResults() > $this->getMaxPerPage();
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}
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throw new Doctrine_Pager_Exception(
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'Cannot know if it is necessary to paginate a not yet executed Pager query'
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);
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}
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/**
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* setPage
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*
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* Defines the current page and automatically adjust offset and limits
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*
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* @param $page current page
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* @return void
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*/
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public function setPage($page)
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{
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$this->_setPage($page);
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$this->_setExecuted(false);
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}
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/**
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* _setPage
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*
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* Defines the current page
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*
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* @param $page current page
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* @return void
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*/
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private function _setPage($page)
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{
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$page = intval($page);
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$this->_page = ($page <= 0) ? 1 : $page;
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}
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/**
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* getLastPage
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*
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* Returns the maximum number of itens per page
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*
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* @return int maximum number of itens per page
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*/
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public function getMaxPerPage()
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{
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return $this->_maxPerPage;
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}
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/**
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* setMaxPerPage
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*
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* Defines the maximum number of itens per page and automatically adjust offset and limits
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*
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* @param $max maximum number of itens per page
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* @return void
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*/
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public function setMaxPerPage($max)
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{
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if ($max > 0) {
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$this->_maxPerPage = $max;
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} else if ($max == 0) {
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$this->_maxPerPage = 25;
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} else {
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$this->_maxPerPage = abs($max);
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}
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$this->_setExecuted(false);
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}
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/**
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* getResultsInPage
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*
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* Returns the number of itens in current page
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*
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* @return int Number of itens in current page
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*/
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public function getResultsInPage()
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{
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$page = $this->getPage();
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if ($page != $this->getLastPage()) {
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return $this->getMaxPerPage();
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}
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$offset = ($this->getPage() - 1) * $this->getMaxPerPage();
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return abs($this->getNumResults() - $offset);
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}
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/**
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* getQuery
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*
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* Returns the Doctrine_Query collector object related to the pager
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*
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* @return Doctrine_Query Doctrine_Query object related to the pager
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*/
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public function getQuery()
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{
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return $this->_query;
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}
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/**
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* _setQuery
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*
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* Defines the collector query to be used by pager
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*
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* @param Doctrine_Query Accepts either a Doctrine_Query object or a string
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* (which does the Doctrine_Query class creation).
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* @return void
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*/
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protected function _setQuery($query)
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{
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if (is_string($query)) {
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$query = Doctrine_Query::create()->parseQuery($query);
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}
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$this->_query = $query;
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}
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/**
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* getCountQuery
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*
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* Returns the Doctrine_Query object that is used to make the count results to pager
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*
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* @return Doctrine_Query Doctrine_Query object related to the pager
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*/
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public function getCountQuery()
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{
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return ($this->_countQuery !== null) ? $this->_countQuery : $this->_query;
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}
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/**
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* setCountQuery
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*
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* Defines the counter query to be used by pager
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*
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* @param Doctrine_Query Accepts either a Doctrine_Query object or a string
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* (which does the Doctrine_Query class creation).
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* @param array Optional params to be used by counter Doctrine_Query.
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* If not defined, the params passed to execute method will be used.
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* @return void
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*/
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public function setCountQuery($query, $params = null)
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{
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if (is_string($query)) {
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$query = Doctrine_Query::create()->parseQuery($query);
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}
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$this->_countQuery = $query;
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$this->setCountQueryParams($params);
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$this->_setExecuted(false);
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}
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/**
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* getCountQueryParams
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*
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* Returns the params to be used by counter Doctrine_Query
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*
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* @return array Doctrine_Query counter params
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*/
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public function getCountQueryParams($defaultParams = array())
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{
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return ($this->_countQueryParams !== null) ? $this->_countQueryParams : $defaultParams;
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}
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/**
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* setCountQueryParams
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*
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* Defines the params to be used by counter Doctrine_Query
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*
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* @param array Optional params to be used by counter Doctrine_Query.
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* If not defined, the params passed to execute method will be used.
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* @param boolean Optional argument that append the query param instead of overriding the existent ones.
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* @return void
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*/
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public function setCountQueryParams($params = array(), $append = false)
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{
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if ($append && is_array($this->_countQueryParams)) {
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$this->_countQueryParams = array_merge($this->_countQueryParams, $params);
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} else {
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if ($params !== null && !is_array($params)) {
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$params = array($params);
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}
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$this->_countQueryParams = $params;
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}
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$this->_setExecuted(false);
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}
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/**
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* execute
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*
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* Executes the query, populates the collection and then return it
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*
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* @param $params Optional parameters to Doctrine_Query::execute
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* @param $hydrationMode Hydration Mode of Doctrine_Query::execute
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* returned ResultSet. Doctrine::Default is FETCH_RECORD
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* @return Doctrine_Collection The root collection
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*/
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public function execute($params = array(), $hydrationMode = Doctrine::FETCH_RECORD)
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{
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if (!$this->getExecuted()) {
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$this->_initialize($params);
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}
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return $this->getQuery()->execute($params, $hydrationMode);
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}
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}
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