@Override
public Sequence<? extends Item> eval(Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
if (contextSeq == null) {
throw new DynamicError("err:XPDY0002", "ContextItem is not set");
}
final INodeSequence<XQNode> src = ProxyNodeSequence.wrap(contextSeq, dynEnv);
final IFocus<XQNode> srcItor = src.iterator();
if (srcItor.hasNext()) {
final XQNode n = srcItor.next();
if (srcItor.hasNext()) {
srcItor.closeQuietly();
reportError(
"err:XPTY0020", "Context item is expected to be a node, but was node sequence.");
}
final XQNode parent = n.parent();
if (parent != null) {
srcItor.closeQuietly();
return new AncestorOrSelfEmuration(parent, getNodeTest(), dynEnv);
}
}
srcItor.closeQuietly();
return NodeSequence.<XQNode>emptySequence();
}
