C:/xampp/htdocs/moodle/mod/workshop/fileinfolib.php

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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/>.

defined('MOODLE_INTERNAL') || die();

class workshop_file_info_submissions_container extends file_info {
    protected $course;
    protected $cm;
    protected $areas;
    protected $filearea;

    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;
    }

    public function get_params() {
        return array('contextid'=>$this->context->id,
                     'component'=>'mod_workshop',
                     'filearea' =>$this->filearea,
                     'itemid'   =>null,
                     'filepath' =>null,
                     'filename' =>null);
    }

    public function get_visible_name() {
        return $this->areas[$this->filearea];
    }

    public function is_writable() {
        return false;
    }

    public function is_directory() {
        return true;
    }

    public function get_children() {
        global $DB;

        $children = array();
        $itemids = $DB->get_records('files', array('contextid' => $this->context->id, 'component' => 'mod_workshop', 'filearea' => $this->filearea),
            'itemid', "DISTINCT itemid");
        foreach ($itemids as $itemid => $unused) {
            if ($child = $this->browser->get_file_info($this->context, $this->filearea, $itemid)) {
                $children[] = $child;
            }
        }
        return $children;
    }

    public function get_parent() {
        return $this->browser->get_file_info($this->context);
    }
}