/**
* Checks if the predicates are successful for the specified item.
*
* @param it item to be checked
* @param ctx query context
* @return result of check
* @throws QueryException query exception
*/
public boolean preds(final Item it, final QueryContext ctx) throws QueryException {
// set context item and position
ctx.value = it;
for (final Expr p : pred) {
final Item i = p.test(ctx, input);
if (i == null) return false;
// item accepted.. adopt last scoring value
it.score(i.score());
}
return true;
}
@Override
public NodeIter iter(final QueryContext ctx) throws QueryException {
final Value v = checkCtx(ctx);
if (!v.type.isNode()) NODESPATH.thrw(input, AxisStep.this, v.type);
final AxisIter ai = axis.iter((ANode) v);
final NodeCache nc = new NodeCache();
for (ANode n; (n = ai.next()) != null; ) if (test.eval(n)) nc.add(n.finish());
// evaluate predicates
for (final Expr p : preds) {
ctx.size = nc.size();
ctx.pos = 1;
int c = 0;
for (int n = 0; n < nc.size(); ++n) {
ctx.value = nc.get(n);
final Item i = p.test(ctx, input);
if (i != null) {
// assign score value
nc.get(n).score(i.score());
nc.item[c++] = nc.get(n);
}
ctx.pos++;
}
nc.size(c);
}
return nc;
}
