explain the description for this method here . concode_field_sep PlaceHolder placeHolder concode_field_sep String getAuthType concode_elem_sep Principal getUserPrincipal concode_elem_sep WindowState getWindowState concode_elem_sep PortletMode getPortletMode concode_elem_sep Map<String,String[]> getPrivateParameterMap concode_elem_sep Enumeration<String> getResponseContentTypes concode_elem_sep Map<String,String[]> getParameterMap concode_elem_sep PortletSession getPortletSession concode_elem_sep PortletSession getPortletSession concode_elem_sep String getResponseContentType concode_elem_sep String getContextPath concode_elem_sep String getServerName concode_elem_sep boolean isPortletModeAllowed concode_elem_sep void setAttribute concode_elem_sep Object getAttribute concode_elem_sep String getETag concode_elem_sep Cookie[] getCookies concode_elem_sep Enumeration<String> getPropertyNames concode_elem_sep PortalContext getPortalContext concode_elem_sep Enumeration<Locale> getLocales concode_elem_sep boolean isWindowStateAllowed concode_elem_sep void removeAttribute concode_elem_sep String getParameter concode_elem_sep String getWindowID concode_elem_sep String[] getParameterValues concode_elem_sep String getProperty concode_elem_sep String getScheme concode_elem_sep Map<String,String[]> getPublicParameterMap concode_elem_sep Enumeration<String> getProperties concode_elem_sep boolean isSecure concode_elem_sep boolean isRequestedSessionIdValid concode_elem_sep boolean isUserInRole concode_elem_sep PortletPreferences getPreferences concode_elem_sep int getServerPort concode_elem_sep Enumeration<String> getAttributeNames concode_elem_sep String getRemoteUser concode_elem_sep Enumeration<String> getParameterNames concode_elem_sep Locale getLocale
String function ( ) { return null ; }