public function process($data) {
        $bulk = new bulk_insert($this->item);
        // Bulk insert messages the data to be passed in
        // ie: for all grades of empty grades apply the specified value.
        if ($bulk->is_applied($data)) {
            $filter = $bulk->get_type($data);
            $insertvalue = $bulk->get_insert_value($data);

            $userid = $this->item->id;
            foreach ($this->items as $gradeitemid => $gradeitem) {
                $null = $gradeitem->gradetype == GRADE_TYPE_SCALE ? -1 : '';
                $field = "finalgrade_{$gradeitem->id}_{$this->itemid}";
                if (isset($data->$field)) {
                    continue;
                }

                $oldfinalgradefield = "oldfinalgrade_{$gradeitem->id}_{$this->itemid}";
                // Bulk grade changes for all grades need to be processed and shouldn't be skipped if they had a previous grade.
                if ($gradeitem->is_course_item() || ($filter != 'all' && !empty($data->$oldfinalgradefield))) {
                    if ($gradeitem->is_course_item()) {
                        // The course total should not be overridden.
                        unset($data->$field);
                        unset($data->oldfinalgradefield);
                        $oldoverride = "oldoverride_{$gradeitem->id}_{$this->itemid}";
                        unset($data->$oldoverride);
                        $oldfeedback = "oldfeedback_{$gradeitem->id}_{$this->itemid}";
                        unset($data->$oldfeedback);
                    }
                    continue;
                }
                $grade = grade_grade::fetch(array(
                    'itemid' => $gradeitemid,
                    'userid' => $userid
                ));

                $data->$field = empty($grade) ? $null : $grade->finalgrade;
                $data->{"old$field"} = $data->$field;
            }

            foreach ($data as $varname => $value) {
                if (preg_match('/^oldoverride_(\d+)_(\d+)/', $varname, $matches)) {
                    // If we've selected overriding all grades.
                    if ($filter == 'all') {
                        $override = "override_{$matches[1]}_{$matches[2]}";
                        $data->$override = '1';
                    }
                }
                if (!preg_match('/^finalgrade_(\d+)_(\d+)/', $varname, $matches)) {
                    continue;
                }

                $gradeitem = grade_item::fetch(array(
                    'courseid' => $this->courseid,
                    'id' => $matches[1]
                ));

                $isscale = ($gradeitem->gradetype == GRADE_TYPE_SCALE);

                $empties = (trim($value) === '' or ($isscale and $value == -1));

                if ($filter == 'all' or $empties) {
                    $data->$varname = ($isscale and empty($insertvalue)) ?
                        -1 : $insertvalue;
                }
            }
        }
        return parent::process($data);
    }