public boolean hasNext() {
if (_eof) return false;
int len = _parent.get_child_count();
if (_next_idx > 0) {
// first we have to verify the position of the
// current value, since it might move if local
// symbol tables get created. In which case it
// will be moved down the list.
int ii = _next_idx - 1;
_next_idx = len; // if we can't find our current
// value we'll be at eof anyway
while (ii < len) {
if (_curr == _parent.get_child(ii)) {
_next_idx = ii + 1;
break;
}
}
}
// if there anything left?
if (_next_idx >= _parent.get_child_count()) {
_eof = true;
}
return !_eof;
}
public IonValue next() {
// the hasNext() is needed to adjust our _next_idx
// value if the underlying arraylist moved under us
if (!hasNext()) {
_curr = null;
} else {
_curr = _parent.get_child(_next_idx);
_next_idx++;
}
return _curr;
}
Children(IonContainer parent) {
if (parent instanceof PrivateIonContainer) {
_parent = (PrivateIonContainer) parent;
_next_idx = 0;
_curr = null;
if (_parent.isNullValue()) {
// otherwise the empty contents member will cause trouble
_eof = true;
}
} else {
throw new UnsupportedOperationException("this only supports IonContainerImpl instances");
}
}
