MDL-27444 Choice module 1.9 backup converts to 2.0 format

So far, user related data are not supported by the project.

mod/choice/backup/moodle1/lib.php

@@ -0,0 +1,111 @@
+<?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 support for the conversion of moodle1 backup to the moodle2 format
+ *
+ * @package    mod
+ * @subpackage choice
+ * @copyright  2011 David Mudrak <david@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Choice conversion handler
+ */
+class moodle1_mod_choice_handler extends moodle1_mod_handler {
+
+    /**
+     * Declare the paths in moodle.xml we are able to convert
+     *
+     * The method returns list of {@link convert_path} instances.
+     * For each path returned, the corresponding conversion method must be
+     * defined.
+     *
+     * Note that the path /MOODLE_BACKUP/COURSE/MODULES/MOD/CHOICE does not
+     * actually exist in the file. The last element with the module name was
+     * appended by the moodle1_converter class.
+     *
+     * @return array of {@link convert_path} instances
+     */
+    public function get_paths() {
+        return array(
+            new convert_path(
+                'choice', '/MOODLE_BACKUP/COURSE/MODULES/MOD/CHOICE',
+                array(
+                    'renamefields' => array(
+                        'text' => 'intro',
+                        'format' => 'introformat',
+                    ),
+                    'newfields' => array(
+                        'completionsubmit' => 0,
+                    ),
+                    'dropfields' => array(
+                        'modtype'
+                    ),
+                )
+            ),
+            new convert_path('choice_option', '/MOODLE_BACKUP/COURSE/MODULES/MOD/CHOICE/OPTIONS/OPTION'),
+        );
+    }
+
+    /**
+     * This is executed every time we have one /MOODLE_BACKUP/COURSE/MODULES/MOD/CHOICE
+     * data available
+     */
+    public function process_choice($data) {
+
+        // get the course module id and context id
+        $instanceid = $data['id'];
+        $moduleid   = $this->get_moduleid($instanceid);
+        $contextid  = $this->converter->get_contextid(CONTEXT_MODULE, $moduleid);
+
+        // we now have all information needed to start writing into the file
+        $this->open_xml_writer("activities/choice_{$moduleid}/choice.xml");
+        $this->xmlwriter->begin_tag('activity', array('id' => $instanceid, 'moduleid' => $moduleid,
+            'modulename' => 'choice', 'contextid' => $contextid));
+        $this->xmlwriter->begin_tag('choice', array('id' => $instanceid));
+
+        unset($data['id']); // we already write it as attribute, do not repeat it as child element
+        foreach ($data as $field => $value) {
+            $this->xmlwriter->full_tag($field, $value);
+        }
+
+        $this->xmlwriter->begin_tag('options');
+    }
+
+    /**
+     * This is executed every time we have one /MOODLE_BACKUP/COURSE/MODULES/MOD/CHOICE/OPTIONS/OPTION
+     * data available
+     */
+    public function process_choice_option($data) {
+        $this->write_xml('option', $data, array('/option/id'));
+    }
+
+    /**
+     * This is executed when we reach the closing </MOD> tag of our 'choice' path
+     */
+    public function on_choice_end() {
+
+        $this->xmlwriter->end_tag('options');
+        $this->xmlwriter->end_tag('choice');
+        $this->xmlwriter->end_tag('activity');
+        $this->close_xml_writer();
+    }
+}