question: gets the names of the parameters . concode_field_sep long MAX_CACHETIME concode_elem_sep long DEFAULT_CACHETIME concode_elem_sep String fileName concode_elem_sep InputStream stream concode_elem_sep long cacheTime concode_elem_sep int bufferSize concode_elem_sep Map<String,String> params concode_elem_sep String contentType concode_field_sep void setBufferSize concode_elem_sep void tryToCloseStream concode_elem_sep void tryToCloseStream concode_elem_sep void setStream concode_elem_sep int getBufferSize concode_elem_sep void writeResponse concode_elem_sep void setCacheTime concode_elem_sep void setFileName concode_elem_sep long getCacheTime concode_elem_sep void setParameter concode_elem_sep String getContentType concode_elem_sep InputStream getStream concode_elem_sep void setContentType concode_elem_sep String getFileName concode_elem_sep String getParameter
target: Iterator < String > function ( ) { if ( params != null ) { return params . keySet ( ) . iterator ( ) ; } return null ; }