public CleanupContext(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;
}

public CleanupContext ( 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 ; }
constructs a new cleanupcontext
