I have this StreamTokenizer Iterator Adapter that is suppose to create a Tokenizer Iterator Index Builder then build the index from a STIA wrapped around a StreamTokenizer. I am having trouble implementing the hasNext and Next for my STIA, can anyone help me, here is my class:

public class StreamTokenizerIteratorAdapter implements Iterator<Token> {

 DefaultIndexImpl index;
 StreamTokenizer source;

 public StreamTokenizerIteratorAdapter(final StreamTokenizer source) {
  if (source == null)
   throw new IllegalArgumentException("source == null");



 }


 @Override
 public boolean hasNext() {

  return !index.isEmpty();
 }


 public Token next() {

  if(!index.isEmpty())
   return next();
  else
  return null;
 }


 @Override
 public void remove() {
  throw new UnsupportedOperationException();
 }
}

Should I be using the source element in the hasNext() and next()?