question: @ Override public Path call ( ) throws Exception { final Set < FileVisitOption > options ; if ( followLinks ) { options = EnumSet . of ( FileVisitOption . FOLLOW_LINKS ) ; } else { options = EnumSet . noneOf ( FileVisitOption . class ) ; } logger . info ( String . format ( "Starting scan of: \"%s\"." , path ) ) ; try { Files . walkFileTree ( path , options , maxDepth , this ) ; } catch ( IOException e ) { logger . log ( Level . SEVERE , String . format ( "Error while scanning path: \"%s\"." , path ) , e ) ; throw e ; } logger . info ( String . format ( "Completed scan of: \"%s\"." , path ) ) ; return path ; }
target:  Recursively walks the file tree of a directory.