question: public RepairContext ( final List < String > nodes , final List < String > keySpaces , final List < String > columnFamilies ) { this . nodes = ( nodes == null ) ? Collections . emptyList ( ) : nodes ; this . keySpaces = ( keySpaces == null ) ? Collections . emptyList ( ) : keySpaces ; this . columnFamilies = ( columnFamilies == null ) ? Collections . emptyList ( ) : columnFamilies ; }
target:  Constructs a new RepairContext.