public SymbolToken symbolValue() {
if (!(_curr instanceof IonSymbol)) {
throw new IllegalStateException();
}
if (_curr.isNullValue()) return null;
return ((IonSymbol) _curr).symbolValue();
}
public boolean isNullValue() {
if (_curr instanceof IonNull) return true;
if (_curr == null) {
throw new IllegalStateException("must call next() before isNullValue()");
}
return _curr.isNullValue();
}
