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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);
}
}