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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/>.

/**
 * Provides code used during file browsing
 *
 * @category  files
 * @package   mod_workshop
 * @copyright 2009 David Mudrak <david.mudrak@gmail.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * Represents virtual root node for all submissions
 *
 * Workshop submission uses two fileareas: submission_content for editor's embeded media
 * and submission_attachment for attachments. In both, the itemid represents the submission id.
 * This container is used to display the list of all submissions in these areas (ie when
 * these areas are browsed with itemid == null).
 */
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;
    }

/**
     * 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'=>$this->context->id,
                     'component'=>'mod_workshop',
                     'filearea' =>$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 nodes
     *
     * @return array of file_info instances
     */
    public function get_children() {
        return $this->get_filtered_children('*', false, true);
    }

/**
     * Helper 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_workshop',
            '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_workshop', $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.
     *
     * NOTE: We don't need the exact number of non empty children if it is >=2
     * In this function 1 is never returned to avoid skipping the single subfolder
     *
     * @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);
    }
}

/**
 * Represents virtual root node for all files in overall feedbacks
 *
 * Overall feedback uses two fileareas: overallfeedback_content for editor's embeded media
 * and overallfeedback_attachment for attachments. In both, the itemid represents the assessment id.
 * This container is used to display the list of all submissions in these areas (ie when
 * these areas are browsed with itemid == null).
 */
class workshop_file_info_overallfeedback_container extends file_info {
    protected $course;
    protected $cm;
    protected $areas;
    protected $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_workshop',
                     '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;
    }

$params = array('contextid' => $this->context->id,
            'component' => 'mod_workshop',
            '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";
        }

/**
     * Returns parent file_info instance
     * @return file_info or null for root
     */
    public function get_parent() {
        return $this->browser->get_file_info($this->context);
    }
}

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