/**
* Extracts connection options.
*
* @param arg argument with options
* @param root expected root element
* @param ctx query context
* @return options
* @throws QueryException query exception
*/
private TokenObjMap<Object> options(final int arg, final QNm root, final QueryContext ctx)
throws QueryException {
// initialize token map
final TokenObjMap<Object> tm = new TokenObjMap<Object>();
// argument does not exist...
if (arg >= expr.length) return tm;
// empty sequence...
final Item it = expr[arg].item(ctx, input);
if (it == null) return tm;
// XQuery map: convert to internal map
if (it instanceof Map) return ((Map) it).tokenJavaMap(input);
// no element: convert XQuery map to internal map
if (!it.type().eq(SeqType.ELM)) throw NODFUNTYPE.thrw(input, this, it.type);
// parse nodes
ANode node = (ANode) it;
if (!node.qname().eq(root)) PARWHICH.thrw(input, node.qname());
// interpret query parameters
final AxisIter ai = node.children();
while ((node = ai.next()) != null) {
final QNm qn = node.qname();
if (!qn.uri().eq(Uri.uri(SQLURI))) PARWHICH.thrw(input, qn);
tm.add(qn.ln(), node.children().next());
}
return tm;
}
/**
* Removes unused namespaces.
*
* @param node to be modified
*/
private static void noPreserve(final ANode node) {
final Atts ns = node.namespaces();
final byte[] pref = node.qname().prefix();
for (int i = ns.size() - 1; i >= 0; i--) {
boolean f = eq(ns.name(i), pref);
final AxisIter atts = node.attributes();
for (ANode it; f && (it = atts.next()) != null; ) {
f |= eq(it.qname().prefix(), pref);
}
if (!f) ns.delete(i);
}
}
/**
* Executes a prepared statement.
*
* @param stmt prepared statement
* @param ctx query context
* @return result
* @throws QueryException query exception
*/
private NodeCache executePrepStmt(final PreparedStatement stmt, final QueryContext ctx)
throws QueryException {
// Get parameters for prepared statement
final ANode params = (ANode) checkType(expr[1].item(ctx, input), NodeType.ELM);
if (!params.qname().eq(E_PARAMS)) PARWHICH.thrw(input, params.qname());
try {
final int placeCount = stmt.getParameterMetaData().getParameterCount();
// Check if number of parameters equals number of place holders
if (placeCount != countParams(params)) PARAMS.thrw(input);
else setParameters(params.children(), stmt);
final boolean result = stmt.execute();
return result ? buildResult(stmt.getResultSet()) : new NodeCache();
} catch (final SQLException ex) {
throw SQLEXC.thrw(input, ex.getMessage());
}
}
/**
* Returns the value of the specified attribute, or {@code null}.
*
* @param name attribute to be found
* @return attribute value
*/
public byte[] attribute(final QNm name) {
final AxisIter ai = attributes();
while (true) {
final ANode node = ai.next();
if (node == null) return null;
if (node.qname().eq(name)) return node.atom();
}
}
/**
* Sets the parameters of a prepared statement.
*
* @param params parameters
* @param stmt prepared statement
* @throws QueryException query exception
*/
private void setParameters(final AxisMoreIter params, final PreparedStatement stmt)
throws QueryException {
int i = 0;
for (ANode next; (next = params.next()) != null; ) {
// Check name
if (!next.qname().eq(E_PARAM)) PARWHICH.thrw(input, next.qname());
final AxisIter attrs = next.attributes();
byte[] paramType = null;
boolean isNull = false;
for (ANode attr; (attr = attrs.next()) != null; ) {
// Attribute "type"
if (eq(attr.nname(), TYPE)) paramType = attr.atom();
// Attribute "null"
else if (eq(attr.nname(), NULL))
isNull = attr.atom() != null && Bln.parse(attr.atom(), input);
// Not expected attribute
else throw NOTEXPATTR.thrw(input, string(attr.nname()));
}
if (paramType == null) NOPARAMTYPE.thrw(input);
final byte[] v = next.atom();
isNull |= v.length == 0;
setParam(++i, stmt, paramType, isNull ? null : string(v), isNull);
}
}
@Override
public FElem item(final QueryContext ctx, final InputInfo ii) throws QueryException {
final int s = prepare(ctx);
try {
// adds in-scope namespaces
final Atts ns = new Atts();
for (int i = 0; i < nspaces.size(); ++i) {
ns.add(nspaces.name(i), nspaces.string(i));
}
// create and check QName
final QNm nm = qname(ctx, ii);
final byte[] cp = nm.prefix(), cu = nm.uri();
if (eq(cp, XML) ^ eq(cu, XMLURI)) CEXML.thrw(input, cu, cp);
if (eq(cu, XMLNSURI)) CEINV.thrw(input, cu);
if (eq(cp, XMLNS)) CEINV.thrw(input, cp);
// analyze element namespace unless it is "xml"
if (!eq(cp, XML)) {
// request namespace for the specified uri
final byte[] uri = ctx.sc.ns.uri(cp);
// check if element has a namespace
if (nm.hasURI()) {
// add to statically known namespaces
if (!comp && (uri == null || !eq(uri, cu))) ctx.sc.ns.add(cp, cu);
// add to in-scope namespaces
if (!ns.contains(cp)) ns.add(cp, cu);
} else {
// element has no namespace: assign default uri
nm.uri(uri);
}
}
// create child and attribute nodes
final Constr constr = new Constr(ii, ctx).add(expr);
if (constr.errAtt) NOATTALL.thrw(input);
if (constr.errNS) NONSALL.thrw(input);
if (constr.duplAtt != null) (comp ? CATTDUPL : ATTDUPL).thrw(input, constr.duplAtt);
if (constr.duplNS != null) DUPLNSCONS.thrw(input, constr.duplNS);
// create node
final FElem node = new FElem(nm, constr.children, constr.atts, ns);
// add namespaces from constructor
final Atts cns = constr.nspaces;
for (int a = 0; a < cns.size(); ++a) {
addNS(cns.name(a), cns.string(a), ns);
}
// update parent references of attributes and add namespaces
for (int a = 0; a < constr.atts.size(); ++a) {
constr.atts.get(a).parent(node);
final ANode att = constr.atts.get(a);
final QNm qnm = att.qname();
// skip attributes without prefixes or URIs
if (!qnm.hasPrefix() || !qnm.hasURI()) continue;
// skip XML namespace
final byte[] apref = qnm.prefix();
if (eq(apref, XML)) continue;
final byte[] auri = qnm.uri();
final byte[] npref = addNS(apref, auri, ns);
if (npref != null) {
constr.atts.item[a] =
new FAttr(new QNm(concat(npref, COLON, qnm.local()), auri), att.string());
}
}
// add inherited namespaces
final Atts stack = ctx.sc.ns.stack();
for (int a = stack.size() - 1; a >= 0; a--) {
final byte[] pref = stack.name(a);
if (!ns.contains(pref)) ns.add(pref, stack.string(a));
}
// update parent references of children
for (int c = 0; c < constr.children.size(); ++c) {
final ANode child = constr.children.get(c).parent(node);
// add inherited and remove unused namespaces
if (child.type == NodeType.ELM) {
if (ctx.sc.nsInherit) inherit(child, ns);
if (!ctx.sc.nsPreserve) noPreserve(child);
child.optimize();
}
}
// return generated and optimized node
return node.optimize();
} finally {
ctx.sc.ns.size(s);
}
}
