105 lines
3.4 KiB
PHP
105 lines
3.4 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; under version 2
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* of the License (non-upgradable).
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (c) 2017 (original work) Open Assessment Technologies SA ;
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*
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*/
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namespace oat\taoClientDiagnostic\model\diagnostic;
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use oat\taoClientDiagnostic\model\storage\PaginatedStorage;
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/**
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* Provides common data helper for datatable component.
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*/
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class Paginator
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{
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/**
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* The default number of rows displayed in a page
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*/
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const DEFAULT_ROWS = 25;
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/**
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* The index of the default page
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*/
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const DEFAULT_PAGE = 1;
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/**
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* The index of the option providing the number of rows per page
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*/
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const OPTION_ROWS = 'rows';
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/**
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* The index of the option providing the page number
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*/
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const OPTION_PAGE = 'page';
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/**
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* The index of the option providing the page filter
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*/
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const OPTION_FILTER = 'filter';
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/**
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* Paginates a collection to render a subset in a table
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*
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* @param array|PaginatedStorage $collection - The full amount of lines to paginate
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* @param array [$options] - Allow to setup the page. These options are supported:
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* - self::OPTION_ROWS : The number of rows per page
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* - self::OPTION_PAGE : The index of the page to get
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* @param function [$dataRenderer] - An optional callback function provided to format the paginated data
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* @return array
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*/
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public function paginate($collection, $options = array(), $dataRenderer = null)
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{
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$optRows = abs(intval(isset($options[self::OPTION_ROWS]) ? $options[self::OPTION_ROWS] : self::DEFAULT_ROWS));
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$optPage = abs(intval(isset($options[self::OPTION_PAGE]) ? $options[self::OPTION_PAGE] : self::DEFAULT_PAGE));
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$optFilter = isset($options[self::OPTION_FILTER]) ? $options[self::OPTION_FILTER] : null;
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if ($collection instanceof PaginatedStorage) {
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$amount = $collection->count($optFilter);
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$paginatedStorage = true;
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} else {
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$amount = count($collection);
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$paginatedStorage = false;
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}
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$rows = max(1, $optRows);
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$total = ceil($amount / $rows);
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$page = max(1, min($optPage, $total));
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$offset = ($page - 1) * $rows;
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$result = array(
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'offset' => $offset,
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'amount' => $amount,
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'total' => $total,
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'page' => $page,
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'rows' => $rows
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);
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if ($paginatedStorage) {
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$result['data'] = $collection->findPage($page, $rows, $optFilter);
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} else {
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$result['data'] = array_slice($collection, $offset, $rows);
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}
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if (is_callable($dataRenderer)) {
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$result['data'] = $dataRenderer($result['data']);
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}
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$result['length'] = count($result['data']);
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return $result;
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}
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} |