Item_Ticket::prepareInputForAdd PHP Method

    function prepareInputForAdd($input)
    {
        // Avoid duplicate entry
        if (countElementsInTable($this->getTable(), ['tickets_id' => $input['tickets_id'], 'itemtype' => $input['itemtype'], 'items_id' => $input['items_id']]) > 0) {
            return false;
        }
        $ticket = new Ticket();
        $ticket->getFromDB($input['tickets_id']);
        // Get item location if location is not already set in ticket
        if (empty($ticket->fields['locations_id'])) {
            if ($input["items_id"] > 0 && !empty($input["itemtype"])) {
                if ($item = getItemForItemtype($input["itemtype"])) {
                    if ($item->getFromDB($input["items_id"])) {
                        if ($item->isField('locations_id')) {
                            $ticket->fields['items_locations'] = $item->fields['locations_id'];
                            // Process Business Rules
                            $rules = new RuleTicketCollection($ticket->fields['entities_id']);
                            $ticket->fields = $rules->processAllRules(Toolbox::stripslashes_deep($ticket->fields), Toolbox::stripslashes_deep($ticket->fields), array('recursive' => true));
                            unset($ticket->fields['items_locations']);
                            $ticket->updateInDB(array('locations_id'));
                        }
                    }
                }
            }
        }
        $group = new Group_Ticket();
        $groups = $group->find("`tickets_id` = " . $input['tickets_id'] . " AND `type` = " . CommonITILActor::REQUESTER);
        if (count($groups) <= 0) {
            if ($input["items_id"] > 0 && !empty($input["itemtype"])) {
                if ($item = getItemForItemtype($input["itemtype"])) {
                    if ($item->getFromDB($input["items_id"])) {
                        if ($item->isField('groups_id')) {
                            $ticket->fields['items_groups'] = $item->fields['groups_id'];
                            // Process Business Rules
                            $rules = new RuleTicketCollection($ticket->fields['entities_id']);
                            $ticket->fields = $rules->processAllRules(Toolbox::stripslashes_deep($ticket->fields), Toolbox::stripslashes_deep($ticket->fields), array('recursive' => true));
                            unset($ticket->fields['items_groups']);
                            if ($item->fields['groups_id'] > 0) {
                                $group->add(array('tickets_id' => $input['tickets_id'], 'groups_id' => $item->fields['groups_id'], 'type' => CommonITILActor::REQUESTER));
                            }
                        }
                    }
                }
            }
        }
        return parent::prepareInputForAdd($input);
    }