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<?php // This file is part of Moodle - http://moodle.org/ // // Moodle is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Moodle is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Moodle. If not, see <http://www.gnu.org/licenses/>. /** * File browsing support. * * @package mod_lesson * @copyright 2013 Frédéric Massart * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ defined('MOODLE_INTERNAL') || die(); /** * File browsing support class. * * @package mod_lesson * @copyright 2013 Frédéric Massart * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class mod_lesson_file_info extends file_info { /** @var stdClass Course object */ protected $course; /** @var stdClass Course module object */ protected $cm; /** @var array Available file areas */ protected $areas; /** @var string File area to browse */ protected $filearea; /** * Constructor * * @param file_browser $browser file_browser instance * @param stdClass $course course object * @param stdClass $cm course module object * @param stdClass $context module context * @param array $areas available file areas * @param string $filearea file area to browse */ public function __construct($browser, $course, $cm, $context, $areas, $filearea) { parent::__construct($browser, $context); $this->course = $course; $this->cm = $cm; $this->areas = $areas; $this->filearea = $filearea; } /** * Returns list of standard virtual file/directory identification. * The difference from stored_file parameters is that null values * are allowed in all fields * @return array with keys contextid, filearea, itemid, filepath and filename */ public function get_params() { return array('contextid' => $this->context->id, 'component' => 'mod_lesson', 'filearea' => $this->filearea, 'itemid' => null, 'filepath' => null, 'filename' => null); } /** * Returns localised visible name. * @return string */ public function get_visible_name() { return $this->areas[$this->filearea]; } /** * Can I add new files or directories? * @return bool */ public function is_writable() { return false; } /** * Is directory? * @return bool */ public function is_directory() { return true; } /** * Returns list of children. * @return array of file_info instances */ public function get_children() { return $this->get_filtered_children('*', false, true); } /** * Help function to return files matching extensions or their count * * @param string|array $extensions, either '*' or array of lowercase extensions, i.e. array('.gif','.jpg') * @param bool|int $countonly if false returns the children, if an int returns just the * count of children but stops counting when $countonly number of children is reached * @param bool $returnemptyfolders if true returns items that don't have matching files inside * @return array|int array of file_info instances or the count */ private function get_filtered_children($extensions = '*', $countonly = false, $returnemptyfolders = false) { global $DB; $params = array( 'contextid' => $this->context->id, 'component' => 'mod_lesson', 'filearea' => $this->filearea ); $sql = 'SELECT DISTINCT itemid FROM {files} WHERE contextid = :contextid AND component = :component AND filearea = :filearea'; if (!$returnemptyfolders) { $sql .= ' AND filename <> :emptyfilename'; $params['emptyfilename'] = '.'; } list($sql2, $params2) = $this->build_search_files_sql($extensions); $sql .= ' ' . $sql2; $params = array_merge($params, $params2); if ($countonly !== false) { $sql .= ' ORDER BY itemid DESC'; } $rs = $DB->get_recordset_sql($sql, $params); $children = array(); foreach ($rs as $record) { if (($child = $this->browser->get_file_info($this->context, 'mod_lesson', $this->filearea, $record->itemid)) && ($returnemptyfolders || $child->count_non_empty_children($extensions))) { $children[] = $child; } if ($countonly !== false && count($children) >= $countonly) { break; } } $rs->close(); if ($countonly !== false) { return count($children); } return $children; } /** * Returns list of children which are either files matching the specified extensions * or folders that contain at least one such file. * * @param string|array $extensions, either '*' or array of lowercase extensions, i.e. array('.gif','.jpg') * @return array of file_info instances */ public function get_non_empty_children($extensions = '*') { return $this->get_filtered_children($extensions, false); } /** * Returns the number of children which are either files matching the specified extensions * or folders containing at least one such file. * * @param string|array $extensions, for example '*' or array('.gif','.jpg') * @param int $limit stop counting after at least $limit non-empty children are found * @return int */ public function count_non_empty_children($extensions = '*', $limit = 1) { return $this->get_filtered_children($extensions, $limit); } /** * Returns parent file_info instance * @return file_info or null for root */ public function get_parent() { return $this->browser->get_file_info($this->context); } }