/**
* Adds path nodes to the list if they comply with the given test conditions.
*
* @param node root node
* @param nodes output nodes
* @param name name id, or {@code 0} as wildcard
* @param kind node kind, or {@code -1} for all types
*/
private void add(
final PathNode node, final ObjList<PathNode> nodes, final int name, final int kind) {
for (final PathNode n : node.ch) {
if (axis == Axis.DESC || axis == Axis.DESCORSELF) {
add(n, nodes, name, kind);
}
if (kind == -1 && n.kind != Data.ATTR ^ axis == Axis.ATTR
|| kind == n.kind && (name == 0 || name == n.name)) {
if (!nodes.contains(n)) nodes.add(n);
}
}
}
/**
* Returns the path nodes that are the result of this step.
*
* @param nodes initial path nodes
* @param data data reference
* @return resulting path nodes, or {@code null} if nodes cannot be evaluated
*/
final ObjList<PathNode> nodes(final ObjList<PathNode> nodes, final Data data) {
// skip steps with predicates or different namespaces
if (preds.length != 0 || data.nspaces.globalNS() == null) return null;
// check restrictions on node type
int kind = -1, name = 0;
if (test.type != null) {
kind = ANode.kind(test.type);
if (kind == Data.PI) return null;
if (test.test == Name.NAME) {
// element/attribute test (*:ln)
final Names names = kind == Data.ATTR ? data.atnindex : data.tagindex;
name = names.id(((NameTest) test).ln);
} else if (test.test != null && test.test != Name.ALL) {
// skip namespace and standard tests
return null;
}
}
// skip axes other than descendant, child, and attribute
if (axis != Axis.ATTR
&& axis != Axis.CHILD
&& axis != Axis.DESC
&& axis != Axis.DESCORSELF
&& axis != Axis.SELF) return null;
final ObjList<PathNode> tmp = new ObjList<PathNode>();
for (final PathNode n : nodes) {
if (axis == Axis.SELF || axis == Axis.DESCORSELF) {
if (kind == -1 || kind == n.kind && (name == 0 || name == n.name)) {
if (!tmp.contains(n)) tmp.add(n);
}
}
if (axis != Axis.SELF) add(n, tmp, name, kind);
}
return tmp;
}