b1da9bb506431fd969b5f4a49a2e783f074b9129
[moodle.git] / backup / moodle2 / backup_activity_task.class.php
1 <?php
3 // This file is part of Moodle - http://moodle.org/
4 //
5 // Moodle is free software: you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation, either version 3 of the License, or
8 // (at your option) any later version.
9 //
10 // Moodle is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 // GNU General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
18 /**
19  * Defines backup_activity_task class
20  *
21  * @package     core_backup
22  * @subpackage  moodle2
23  * @category    backup
24  * @copyright   2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
25  * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
26  */
28 defined('MOODLE_INTERNAL') || die();
30 /**
31  * Provides all the settings and steps to perform one complete backup of the activity
32  *
33  * Activities are supposed to provide the subclass of this class in their file
34  * mod/MODULENAME/backup/moodle2/backup_MODULENAME_activity_task.class.php
35  * The expected name of the subclass is backup_MODULENAME_activity_task
36  */
37 abstract class backup_activity_task extends backup_task {
39     protected $moduleid;
40     protected $sectionid;
41     protected $modulename;
42     protected $activityid;
43     protected $contextid;
45     /**
46      * Constructor - instantiates one object of this class
47      *
48      * @param string $name the task identifier
49      * @param int $moduleid course module id (id in course_modules table)
50      * @param backup_plan|null $plan the backup plan instance this task is part of
51      */
52     public function __construct($name, $moduleid, $plan = null) {
54         // Check moduleid exists
55         if (!$coursemodule = get_coursemodule_from_id(false, $moduleid)) {
56             throw new backup_task_exception('activity_task_coursemodule_not_found', $moduleid);
57         }
58         // Check activity supports this moodle2 backup format
59         if (!plugin_supports('mod', $coursemodule->modname, FEATURE_BACKUP_MOODLE2)) {
60             throw new backup_task_exception('activity_task_activity_lacks_moodle2_backup_support', $coursemodule->modname);
61         }
63         $this->moduleid   = $moduleid;
64         $this->sectionid  = $coursemodule->section;
65         $this->modulename = $coursemodule->modname;
66         $this->activityid = $coursemodule->instance;
67         $this->contextid  = context_module::instance($this->moduleid)->id;
69         parent::__construct($name, $plan);
70     }
72     /**
73      * @return int the course module id (id in the course_modules table)
74      */
75     public function get_moduleid() {
76         return $this->moduleid;
77     }
79     /**
80      * @return int the course section id (id in the course_sections table)
81      */
82     public function get_sectionid() {
83         return $this->sectionid;
84     }
86     /**
87      * @return string the name of the module, eg 'workshop' (from the modules table)
88      */
89     public function get_modulename() {
90         return $this->modulename;
91     }
93     /**
94      * @return int the id of the activity instance (id in the activity's instances table)
95      */
96     public function get_activityid() {
97         return $this->activityid;
98     }
100     /**
101      * @return int the id of the associated CONTEXT_MODULE instance
102      */
103     public function get_contextid() {
104         return $this->contextid;
105     }
107     /**
108      * @return string full path to the directory where this task writes its files
109      */
110     public function get_taskbasepath() {
111         return $this->get_basepath() . '/activities/' . $this->modulename . '_' . $this->moduleid;
112     }
114     /**
115      * Create all the steps that will be part of this task
116      */
117     public function build() {
119         // If we have decided not to backup activities, prevent anything to be built
120         if (!$this->get_setting_value('activities')) {
121             $this->built = true;
122             return;
123         }
125         // Add some extra settings that related processors are going to need
126         $this->add_setting(new backup_activity_generic_setting(backup::VAR_MODID, base_setting::IS_INTEGER, $this->moduleid));
127         $this->add_setting(new backup_activity_generic_setting(backup::VAR_COURSEID, base_setting::IS_INTEGER, $this->get_courseid()));
128         $this->add_setting(new backup_activity_generic_setting(backup::VAR_SECTIONID, base_setting::IS_INTEGER, $this->sectionid));
129         $this->add_setting(new backup_activity_generic_setting(backup::VAR_MODNAME, base_setting::IS_FILENAME, $this->modulename));
130         $this->add_setting(new backup_activity_generic_setting(backup::VAR_ACTIVITYID, base_setting::IS_INTEGER, $this->activityid));
131         $this->add_setting(new backup_activity_generic_setting(backup::VAR_CONTEXTID, base_setting::IS_INTEGER, $this->contextid));
133         // Create the activity directory
134         $this->add_step(new create_taskbasepath_directory('create_activity_directory'));
136         // Generate the module.xml file, containing general information for the
137         // activity and from its related course_modules record and availability
138         $this->add_step(new backup_module_structure_step('module_info', 'module.xml'));
140         // Annotate the groups used in already annotated groupings if groups are to be backed up.
141         if ($this->get_setting_value('groups')) {
142             $this->add_step(new backup_annotate_groups_from_groupings('annotate_groups'));
143         }
145         // Here we add all the common steps for any activity and, in the point of interest
146         // we call to define_my_steps() is order to get the particular ones inserted in place.
147         $this->define_my_steps();
149         // Generate the roles file (optionally role assignments and always role overrides)
150         $this->add_step(new backup_roles_structure_step('activity_roles', 'roles.xml'));
152         // Generate the filter file (conditionally)
153         if ($this->get_setting_value('filters')) {
154             $this->add_step(new backup_filters_structure_step('activity_filters', 'filters.xml'));
155         }
157         // Generate the comments file (conditionally)
158         if ($this->get_setting_value('comments')) {
159             $this->add_step(new backup_comments_structure_step('activity_comments', 'comments.xml'));
160         }
162         // Generate the userscompletion file (conditionally)
163         if ($this->get_setting_value('userscompletion')) {
164             $this->add_step(new backup_userscompletion_structure_step('activity_userscompletion', 'completion.xml'));
165         }
167         // Generate the logs file (conditionally)
168         if ($this->get_setting_value('logs')) {
169             // Legacy logs.
170             $this->add_step(new backup_activity_logs_structure_step('activity_logs', 'logs.xml'));
171             // New log stores.
172             $this->add_step(new backup_activity_logstores_structure_step('activity_logstores', 'logstores.xml'));
173         }
175         // Generate the calendar events file (conditionally)
176         if ($this->get_setting_value('calendarevents')) {
177             $this->add_step(new backup_calendarevents_structure_step('activity_calendar', 'calendar.xml'));
178         }
180         // Fetch all the activity grade items and put them to backup_ids
181         $this->add_step(new backup_activity_grade_items_to_ids('fetch_activity_grade_items'));
183         // Generate the grades file
184         $this->add_step(new backup_activity_grades_structure_step('activity_grades', 'grades.xml'));
186         // Generate the grading file (conditionally)
187         $this->add_step(new backup_activity_grading_structure_step('activity_grading', 'grading.xml'));
189         // Generate the grade history file. The setting 'grade_histories' is handled in the step.
190         $this->add_step(new backup_activity_grade_history_structure_step('activity_grade_history', 'grade_history.xml'));
192         // Generate the competency file.
193         $this->add_step(new backup_activity_competencies_structure_step('activity_competencies', 'competencies.xml'));
195         // Annotate the scales used in already annotated outcomes
196         $this->add_step(new backup_annotate_scales_from_outcomes('annotate_scales'));
198         // NOTE: Historical grade information is saved completely at course level only (see 1.9)
199         // not per activity nor per selected activities (all or nothing).
201         // Generate the inforef file (must be after ALL steps gathering annotations of ANY type)
202         $this->add_step(new backup_inforef_structure_step('activity_inforef', 'inforef.xml'));
204         // Migrate the already exported inforef entries to final ones
205         $this->add_step(new move_inforef_annotations_to_final('migrate_inforef'));
207         // At the end, mark it as built
208         $this->built = true;
209     }
211     /**
212      * Exceptionally override the execute method, so, based in the activity_included setting, we are able
213      * to skip the execution of one task completely
214      */
215     public function execute() {
217         // Find activity_included_setting
218         if (!$this->get_setting_value('included')) {
219             $this->log('activity skipped by _included setting', backup::LOG_DEBUG, $this->name);
220             $this->plan->set_excluding_activities();
221         } else { // Setting tells us it's ok to execute
222             parent::execute();
223         }
224     }
227     /**
228      * Tries to look for the instance specific setting value, task specific setting value or the
229      * common plan setting value - in that order
230      *
231      * @param string $name the name of the setting
232      * @return mixed|null the value of the setting or null if not found
233      */
234     public function get_setting($name) {
235         $namewithprefix = $this->modulename . '_' . $this->moduleid . '_' . $name;
236         $result = null;
237         foreach ($this->settings as $key => $setting) {
238             if ($setting->get_name() == $namewithprefix) {
239                 if ($result != null) {
240                     throw new base_task_exception('multiple_settings_by_name_found', $namewithprefix);
241                 } else {
242                     $result = $setting;
243                 }
244             }
245         }
246         if ($result) {
247             return $result;
248         } else {
249             // Fallback to parent
250             return parent::get_setting($name);
251         }
252     }
254 // Protected API starts here
256     /**
257      * Defines the common setting that any backup activity will have
258      */
259     protected function define_settings() {
260         global $CFG;
261         require_once($CFG->libdir.'/questionlib.php');
263         // All the settings related to this activity will include this prefix
264         $settingprefix = $this->modulename . '_' . $this->moduleid . '_';
266         // All these are common settings to be shared by all activities
268         // Define activity_include (to decide if the whole task must be really executed)
269         // Dependent of:
270         // - activities root setting
271         // - section_included setting (if exists)
272         $settingname = $settingprefix . 'included';
273         $activity_included = new backup_activity_generic_setting($settingname, base_setting::IS_BOOLEAN, true);
274         $activity_included->get_ui()->set_icon(new image_icon('icon', get_string('pluginname', $this->modulename),
275             $this->modulename, array('class' => 'iconlarge icon-post')));
276         $this->add_setting($activity_included);
277         // Look for "activities" root setting
278         $activities = $this->plan->get_setting('activities');
279         $activities->add_dependency($activity_included);
281         if (question_module_uses_questions($this->modulename)) {
282             $questionbank = $this->plan->get_setting('questionbank');
283             $questionbank->add_dependency($activity_included);
284         }
286         // Look for "section_included" section setting (if exists)
287         $settingname = 'section_' . $this->sectionid . '_included';
288         if ($this->plan->setting_exists($settingname)) {
289             $section_included = $this->plan->get_setting($settingname);
290             $section_included->add_dependency($activity_included);
291         }
293         // Define activity_userinfo. Dependent of:
294         // - users root setting
295         // - section_userinfo setting (if exists)
296         // - activity_included setting
297         $settingname = $settingprefix . 'userinfo';
298         $activity_userinfo = new backup_activity_userinfo_setting($settingname, base_setting::IS_BOOLEAN, true);
299         //$activity_userinfo->get_ui()->set_label(get_string('includeuserinfo','backup'));
300         $activity_userinfo->get_ui()->set_label('-');
301         $this->add_setting($activity_userinfo);
302         // Look for "users" root setting
303         $users = $this->plan->get_setting('users');
304         $users->add_dependency($activity_userinfo);
305         // Look for "section_userinfo" section setting (if exists)
306         $settingname = 'section_' . $this->sectionid . '_userinfo';
307         if ($this->plan->setting_exists($settingname)) {
308             $section_userinfo = $this->plan->get_setting($settingname);
309             $section_userinfo->add_dependency($activity_userinfo);
310         }
311         // Look for "activity_included" setting
312         $activity_included->add_dependency($activity_userinfo);
314         // End of common activity settings, let's add the particular ones
315         $this->define_my_settings();
316     }
318     /**
319      * Defines activity specific settings to be added to the common ones
320      *
321      * This method is called from {@link self::define_settings()}. The activity module
322      * author may use it to define additional settings that influence the execution of
323      * the backup.
324      *
325      * Most activities just leave the method empty.
326      *
327      * @see self::define_settings() for the example how to define own settings
328      */
329     abstract protected function define_my_settings();
331     /**
332      * Defines activity specific steps for this task
333      *
334      * This method is called from {@link self::build()}. Activities are supposed
335      * to call {self::add_step()} in it to include their specific steps in the
336      * backup plan.
337      */
338     abstract protected function define_my_steps();
340     /**
341      * Encodes URLs to the activity instance's scripts into a site-independent form
342      *
343      * The current instance of the activity may be referenced from other places in
344      * the course by URLs like http://my.moodle.site/mod/workshop/view.php?id=42
345      * Obvisouly, such URLs are not valid any more once the course is restored elsewhere.
346      * For this reason the backup file does not store the original URLs but encodes them
347      * into a transportable form. During the restore, the reverse process is applied and
348      * the encoded URLs are replaced with the new ones valid for the target site.
349      *
350      * Every plugin must override this method in its subclass.
351      *
352      * @see backup_xml_transformer class that actually runs the transformation
353      * @param string $content some HTML text that eventually contains URLs to the activity instance scripts
354      * @return string the content with the URLs encoded
355      */
356     static public function encode_content_links($content) {
357         throw new coding_exception('encode_content_links() method needs to be overridden in each subclass of backup_activity_task');
358     }