question: return the current database system version . concode_field_sep String BUFFER_VERSION_FILE concode_elem_sep String DB_VERSION_FILE concode_elem_sep String VERSION_FILE_NAME concode_field_sep void logDebugMessage concode_elem_sep int getBufferSystemVersion concode_elem_sep void run concode_elem_sep String getServerInstallDirectory concode_elem_sep int compareTo concode_elem_sep String getDescription concode_elem_sep int version concode_elem_sep int getCurrentSystemVersion concode_elem_sep void setCurrentSystemVersion concode_elem_sep void logErrorMessage concode_elem_sep String decorateLogMessage concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep void doTask concode_elem_sep void logWarnMessage concode_elem_sep String toString concode_elem_sep void logInfoMessage
target: int function ( ) { if ( FileSystem . hasFile ( DB_VERSION_FILE ) ) { return FileSystem . map ( DB_VERSION_FILE , MapMode . READ_ONLY , 0 , 4 ) . getInt ( ) ; } else { return 0 ; } }