@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;
}
/**
* 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();
}
}
/**
* Returns the uri for the specified prefix.
*
* @param pref prefix
* @param ctx query context
* @return uri
*/
public final byte[] uri(final byte[] pref, final QueryContext ctx) {
final Atts at = ns();
if (at != null) {
final int i = at.get(pref);
if (i != -1) return at.val[i];
final ANode n = parent();
if (n != null) return n.uri(pref, ctx);
}
return pref.length == 0 ? Token.EMPTY : null;
}
@Override
public URI getNodeUri() throws XQException {
opened();
if (!it.node()) throw new BXQException(NODE);
final ANode node = (ANode) it;
try {
return new URI(Token.string(node.base()));
} catch (final URISyntaxException ex) {
throw new BXQException(ex.toString());
}
}
/**
* 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);
}
}
/**
* Inherits namespaces.
*
* @param node to be modified
* @param nsp in-scope namespaces
*/
private static void inherit(final ANode node, final Atts nsp) {
final Atts ns = node.namespaces();
for (int a = nsp.size() - 1; a >= 0; a--) {
final byte[] pref = nsp.name(a);
if (!ns.contains(pref)) ns.add(pref, nsp.string(a));
}
}
/**
* Returns the namespace hierarchy.
*
* @param nsInherit copy-namespaces inherit
* @return namespaces [LW][LK] Namespaces: this isn't enough
*/
public final Atts nsScope(final boolean nsInherit) {
final Atts ns = new Atts();
ANode n = this;
do {
final Atts nns = n.ns();
if (!nsInherit) return nns;
if (nns != null) {
for (int a = nns.size - 1; a >= 0; a--) {
final byte[] key = nns.key[a];
if (!ns.contains(key)) ns.add(key, nns.val[a]);
}
}
n = n.parent();
} while (n != null && n.type == NodeType.ELM);
return ns;
}
/**
* 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());
}
}
/**
* Builds full-text information.
*
* @param nd node to be added
* @return number of added nodes
*/
TokenList build(final ANode nd) {
// check full-text mode
if (!(nd instanceof DBNode)) return null;
// check if full-text data exists for the current node
final DBNode node = (DBNode) nd;
return build(node.data, node.pre, nd.string());
}
@Override
public void prepare() throws QueryException {
// build data with all documents, to prevent dirty reads
md = new MemData(data);
for (final Item d : docs) {
final MemData docData;
if (d.node()) {
// adding a document node
final ANode doc = (ANode) d;
if (doc.ndType() != NodeType.DOC) UPDOCTYPE.thrw(input, doc);
docData = new MemData(data);
new DataBuilder(docData).build(doc);
} else if (d.str()) {
// adding file(s) from a path
final String docpath = string(d.atom(input));
final String nm = ctx.mprop.random(data.meta.name);
final DirParser p = new DirParser(IO.get(docpath), ctx.prop);
final MemBuilder b = new MemBuilder(nm, p, ctx.prop);
try {
docData = b.build();
} catch (final IOException e) {
throw DOCERR.thrw(input, docpath);
}
} else {
throw STRNODTYPE.thrw(input, this, d.type);
}
md.insert(md.meta.size, -1, docData);
}
// set new names, if needed
final IntList pres = md.doc();
if (pres.size() == 1 && name != null) {
// name is specified and a single document is added: set the name
final byte[] nm = path == null ? name : concat(path, SLASH, name);
md.update(pres.get(0), Data.DOC, nm);
} else if (path != null) {
// path is specified: replace the path of each new document
for (int i = 0, is = pres.size(); i < is; i++) {
final int d = pres.get(i);
final byte[] old = md.text(d, true);
final int p = lastIndexOf(old, '/');
final byte[] nm = p < 0 ? old : subtoken(old, p + 1);
md.update(d, Data.DOC, concat(path, SLASH, nm));
}
}
}
/**
* 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;
}
/**
* 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;
}
@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);
}
}
/**
* Adds children of a sub node.
*
* @param ch child nodes
* @param nc node cache
*/
protected final void addDesc(final AxisMoreIter ch, final NodeCache nc) {
for (ANode n; (n = ch.next()) != null; ) {
nc.add(n.finish());
addDesc(n.children(), nc);
}
}
/**
* 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);
}
}
/**
* Counts the numbers of <sql:parameter/> elements.
*
* @param params element <sql:parameter/>
* @return number of parameters
*/
private long countParams(final ANode params) {
final AxisIter ch = params.children();
long c = ch.size();
if (c == -1) do ++c; while (ch.next() != null);
return c;
}
