question: public void flush ( ) { try { File currentDir = new File ( path ) ; for ( File f : currentDir . listFiles ( ) ) { if ( f . isDirectory ( ) ) FileUtils . deleteDirectory ( f ) ; else FileUtils . deleteQuietly ( f ) ; } notifyObservers ( ) ; } catch ( Exception e ) { e . printStackTrace ( ) ; } }
target:  Flush the current WaspHash - all the key/values will be removed