question: public static StringSet extractValuesFromStringSet ( String key , StringSetMap volumeInformation ) { try { StringSet returnSet = new StringSet ( ) ; StringSet availableValueSet = volumeInformation . get ( key ) ; if ( null != availableValueSet ) { for ( String value : availableValueSet ) { returnSet . add ( value ) ; } } return returnSet ; } catch ( Exception e ) { _logger . error ( e . getMessage ( ) , e ) ; } return null ; }
target:  extract values from a String Set This method is used, to get value from a StringSet of variable size.