question: public boolean shiftProcessedDump ( String dumpName ) { File f = new File ( this . dump_dir_import , dumpName ) ; if ( ! f . exists ( ) ) return false ; File g = new File ( this . dump_dir_imported , dumpName ) ; if ( g . exists ( ) ) g . delete ( ) ; return f . renameTo ( g ) ; }
target:  move a file from the import directory to the imported directory.