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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  
  18  /**
  19   * Utility class for browsing of system files.
  20   *
  21   * @package    core_files
  22   * @copyright  2008 Petr Skoda (http://skodak.org)
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   */
  25  
  26  defined('MOODLE_INTERNAL') || die();
  27  
  28  /**
  29   * Represents the system context in the tree navigated by {@link file_browser}.
  30   *
  31   * @package    core_files
  32   * @copyright  2008 Petr Skoda (http://skodak.org)
  33   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  34   */
  35  class file_info_context_system extends file_info {
  36  
  37      /**
  38       * Constructor
  39       *
  40       * @param file_browser $browser file_browser instance
  41       * @param stdClass $context context object
  42       */
  43      public function __construct($browser, $context) {
  44          parent::__construct($browser, $context);
  45      }
  46  
  47      /**
  48       * Return information about this specific part of context level
  49       *
  50       * @param string $component component
  51       * @param string $filearea file area
  52       * @param int $itemid item ID
  53       * @param string $filepath file path
  54       * @param string $filename file name
  55       */
  56      public function get_file_info($component, $filearea, $itemid, $filepath, $filename) {
  57          if (empty($component)) {
  58              return $this;
  59          }
  60  
  61          // no components supported at this level yet
  62          return null;
  63      }
  64  
  65      /**
  66       * Returns localised visible name.
  67       *
  68       * @return string
  69       */
  70      public function get_visible_name() {
  71          return get_string('arearoot', 'repository');
  72      }
  73  
  74      /**
  75       * Whether or not new files or directories can be added
  76       *
  77       * @return bool
  78       */
  79      public function is_writable() {
  80          return false;
  81      }
  82  
  83      /**
  84       * Whether or not this is a directory
  85       *
  86       * @return bool
  87       */
  88      public function is_directory() {
  89          return true;
  90      }
  91  
  92      /**
  93       * Returns list of children.
  94       *
  95       * @return array of file_info instances
  96       */
  97      public function get_children() {
  98          global $DB, $USER;
  99  
 100          $children = array();
 101  
 102          $course_cats = $DB->get_records('course_categories', array('parent'=>0), 'sortorder', 'id,visible');
 103          foreach ($course_cats as $category) {
 104              $context = context_coursecat::instance($category->id);
 105              if (!$category->visible and !has_capability('moodle/category:viewhiddencategories', $context)) {
 106                  continue;
 107              }
 108              if ($child = $this->browser->get_file_info($context)) {
 109                  $children[] = $child;
 110              }
 111          }
 112  
 113          $courses = $DB->get_records('course', array('category'=>0), 'sortorder', 'id,visible');
 114          foreach ($courses as $course) {
 115              if (!$course->visible and !has_capability('moodle/course:viewhiddencourses', $context)) {
 116                  continue;
 117              }
 118              $context = context_course::instance($course->id);
 119              if ($child = $this->browser->get_file_info($context)) {
 120                  $children[] = $child;
 121              }
 122          }
 123  
 124          return $children;
 125      }
 126  
 127      /**
 128       * Returns parent file_info instance
 129       *
 130       * @return file_info|null file_info instance or null for root
 131       */
 132      public function get_parent() {
 133          return null;
 134      }
 135  }