/**
  * @param mixed $parser
  * @param string $tag
  * @param array $attribs
  *
  * @todo In 'LOGGER' case find a better way to detect 'getLogger()' method
  */
 private function tagOpen($parser, $tag, $attribs)
 {
     switch ($tag) {
         case 'CONFIGURATION':
         case self::XMLNS . ':CONFIGURATION':
             if (isset($attribs['THRESHOLD'])) {
                 $this->repository->setThreshold(Ideasa_Log4php_Helpers_LoggerOptionConverter::toLevel($this->subst($attribs['THRESHOLD']), $this->repository->getThreshold()));
             }
             break;
         case 'APPENDER':
         case self::XMLNS . ':APPENDER':
             unset($this->appender);
             $this->appender = null;
             $name = $this->subst(@$attribs['NAME']);
             $class = $this->subst(@$attribs['CLASS']);
             $this->appender = Ideasa_Log4php_LoggerAppenderPool::getAppenderFromPool($name, $class);
             if (isset($attribs['THRESHOLD'])) {
                 $this->appender->setThreshold(Ideasa_Log4php_Helpers_LoggerOptionConverter::toLevel($this->subst($attribs['THRESHOLD']), $this->appender->getThreshold()));
             }
             $this->state[] = self::APPENDER_STATE;
             break;
         case 'APPENDER_REF':
         case 'APPENDER-REF':
         case self::XMLNS . ':APPENDER_REF':
         case self::XMLNS . ':APPENDER-REF':
             if (isset($attribs['REF']) and !empty($attribs['REF'])) {
                 $appenderName = $this->subst($attribs['REF']);
                 $appender = Ideasa_Log4php_LoggerAppenderPool::getAppenderFromPool($appenderName);
                 if ($appender !== null) {
                     switch (end($this->state)) {
                         case self::LOGGER_STATE:
                         case self::ROOT_STATE:
                             $this->logger->addAppender($appender);
                             break;
                     }
                 }
             }
             break;
         case 'FILTER':
         case self::XMLNS . ':FILTER':
             unset($this->filter);
             $this->filter = null;
             $filterName = basename($this->subst(@$attribs['CLASS']));
             if (!empty($filterName)) {
                 $this->filter = new $filterName();
                 $this->state[] = self::FILTER_STATE;
             }
             break;
         case 'LAYOUT':
         case self::XMLNS . ':LAYOUT':
             $class = @$attribs['CLASS'];
             $this->layout = Ideasa_Log4php_LoggerReflectionUtils::createObject($this->subst($class));
             $this->state[] = self::LAYOUT_STATE;
             break;
         case 'LOGGER':
         case self::XMLNS . ':LOGGER':
             // $this->logger is assigned by reference.
             // Only '$this->logger=null;' destroys referenced object
             unset($this->logger);
             $this->logger = null;
             $loggerName = $this->subst(@$attribs['NAME']);
             if (!empty($loggerName)) {
                 $this->logger = $this->repository->getLogger($loggerName);
                 if ($this->logger !== null and isset($attribs['ADDITIVITY'])) {
                     $additivity = Ideasa_Log4php_Helpers_LoggerOptionConverter::toBoolean($this->subst($attribs['ADDITIVITY']), true);
                     $this->logger->setAdditivity($additivity);
                 }
             }
             $this->state[] = self::LOGGER_STATE;
             break;
         case 'LEVEL':
         case self::XMLNS . ':LEVEL':
         case 'PRIORITY':
         case self::XMLNS . ':PRIORITY':
             if (!isset($attribs['VALUE'])) {
                 // LoggerDOMConfigurator::tagOpen() LEVEL value not set
                 break;
             }
             if ($this->logger === null) {
                 // LoggerDOMConfigurator::tagOpen() LEVEL. parent logger is null
                 break;
             }
             switch (end($this->state)) {
                 case self::ROOT_STATE:
                     $this->logger->setLevel(Ideasa_Log4php_Helpers_LoggerOptionConverter::toLevel($this->subst($attribs['VALUE']), $this->logger->getLevel()));
                     break;
                 case self::LOGGER_STATE:
                     $this->logger->setLevel(Ideasa_Log4php_Helpers_LoggerOptionConverter::toLevel($this->subst($attribs['VALUE']), $this->logger->getLevel()));
                     break;
                 default:
                     //LoggerLog::warn("LoggerDOMConfigurator::tagOpen() LEVEL state '{$this->state}' not allowed here");
             }
             break;
         case 'PARAM':
         case self::XMLNS . ':PARAM':
             if (!isset($attribs['NAME'])) {
                 // LoggerDOMConfigurator::tagOpen() PARAM attribute 'name' not defined.
                 break;
             }
             if (!isset($attribs['VALUE'])) {
                 // LoggerDOMConfigurator::tagOpen() PARAM. attribute 'value' not defined.
                 break;
             }
             switch (end($this->state)) {
                 case self::APPENDER_STATE:
                     if ($this->appender !== null) {
                         Ideasa_Log4php_LoggerReflectionUtils::setter($this->appender, $this->subst($attribs['NAME']), $this->subst($attribs['VALUE']));
                     }
                     break;
                 case self::LAYOUT_STATE:
                     if ($this->layout !== null) {
                         Ideasa_Log4php_LoggerReflectionUtils::setter($this->layout, $this->subst($attribs['NAME']), $this->subst($attribs['VALUE']));
                     }
                     break;
                 case self::FILTER_STATE:
                     if ($this->filter !== null) {
                         Ideasa_Log4php_LoggerReflectionUtils::setter($this->filter, $this->subst($attribs['NAME']), $this->subst($attribs['VALUE']));
                     }
                     break;
                 default:
                     //LoggerLog::warn("LoggerDOMConfigurator::tagOpen() PARAM state '{$this->state}' not allowed here");
             }
             break;
         case 'RENDERER':
         case self::XMLNS . ':RENDERER':
             $renderedClass = $this->subst(@$attribs['RENDEREDCLASS']);
             $renderingClass = $this->subst(@$attribs['RENDERINGCLASS']);
             if (!empty($renderedClass) and !empty($renderingClass)) {
                 $this->repository->getRendererMap()->addRenderer($renderedClass, $renderingClass);
             }
             break;
         case 'ROOT':
         case self::XMLNS . ':ROOT':
             $this->logger = Ideasa_Log4php_Logger::getRootLogger();
             $this->state[] = self::ROOT_STATE;
             break;
     }
 }