/** * Returns the initial context value of a path or {@code null}. * * @param qc query context (may be @code null) * @return root */ private Value initial(final QueryContext qc) { // current context value final Value v = qc != null ? qc.value : null; // no root or context expression: return context if (root == null || root instanceof Context) return v; // root reference if (root instanceof Root) return v != null && v instanceof Item ? Root.root(v) : v; // root is value: return root if (root.isValue()) return (Value) root; // data reference final Data d = root.data(); if (d != null) return new DBNode(d, 0, Data.ELEM); // otherwise, return null return null; }
@Override public Data data() { if (root != null) { // data reference final Data data = root.data(); if (data != null) { final int sl = steps.length; for (int s = 0; s < sl; s++) { if (axisStep(s) == null) return null; } return data; } } return null; }