/**
  * Public function that creates a single instance
  */
 public static function getInstance()
 {
     if (!isset(self::$_instance)) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }
 /**
  * Handle drawing list of delivery method prices
  *
  * @param array $tag_params
  * @param array $children
  */
 public function tag_DeliveryPricesList($tag_params, $children)
 {
     $manager = ShopDeliveryMethodPricesManager::getInstance();
     $conditions = array();
     $relations = array();
     // prepare filtering conditions
     if (isset($tag_params['method'])) {
         $conditions['method'] = fix_id($tag_params['method']);
     }
     if (isset($_REQUEST['method'])) {
         $conditions['method'] = fix_id($_REQUEST['method']);
     }
     // get relations with shop item
     if (isset($tag_params['item'])) {
         $relations_manager = ShopDeliveryItemRelationsManager::getInstance();
         $item_id = fix_id($tag_params['item']);
         $raw_relations = $relations_manager->getItems(array('price'), array('item' => $item_id));
         if (count($raw_relations) > 0) {
             foreach ($raw_relations as $relation) {
                 $relations[] = $relation->price;
             }
         }
     }
     // get template
     $template = $this->_parent->loadTemplate($tag_params, 'delivery_method_prices_list_item.xml');
     // get items from database
     $items = $manager->getItems($manager->getFieldNames(), $conditions);
     if (count($items) > 0) {
         foreach ($items as $item) {
             $params = array('id' => $item->id, 'value' => $item->value, 'method' => isset($conditions['method']) ? $conditions['method'] : 0, 'selected' => in_array($item->id, $relations) ? 1 : 0, 'item_change' => url_MakeHyperlink($this->_parent->getLanguageConstant('change'), window_Open('shop_delivery_price_change', 370, $this->_parent->getLanguageConstant('title_delivery_method_price_change'), true, true, url_Make('transfer_control', 'backend_module', array('module', $this->name), array('backend_action', 'delivery_methods'), array('sub_action', 'change_price'), array('id', $item->id)))), 'item_delete' => url_MakeHyperlink($this->_parent->getLanguageConstant('delete'), window_Open('shop_delivery_price_delete', 400, $this->_parent->getLanguageConstant('title_delivery_method_price_delete'), false, false, url_Make('transfer_control', 'backend_module', array('module', $this->name), array('backend_action', 'delivery_methods'), array('sub_action', 'delete_price'), array('id', $item->id)))));
             $template->setLocalParams($params);
             $template->restoreXML();
             $template->parse();
         }
     }
 }