* <code>XPathVisitor</code>.
* @return the current <code>QueryNode</code>. Can be different from
* <code>data</code>.
*/
public Object visit(SimpleNode node, Object data) {
QueryNode queryNode = (QueryNode) data;
switch (node.getId()) {
case JJTXPATH2:
queryNode = createPathQueryNode(node);
break;
case JJTROOT:
case JJTROOTDESCENDANTS:
if (queryNode instanceof PathQueryNode) {
((PathQueryNode) queryNode).setAbsolute(true);
} else {
exceptions.add(new InvalidQueryException(
"Unsupported root level query node: " + queryNode));
}
break;
case JJTSTEPEXPR:
if (isAttributeAxis(node)) {
if (queryNode.getType() == QueryNode.TYPE_RELATION
|| (queryNode.getType() == QueryNode.TYPE_DEREF && ((DerefQueryNode) queryNode).getRefProperty() == null)
|| queryNode.getType() == QueryNode.TYPE_ORDER
|| queryNode.getType() == QueryNode.TYPE_PATH
|| queryNode.getType() == QueryNode.TYPE_TEXTSEARCH) {
// traverse
node.childrenAccept(this, queryNode);
} else if (queryNode.getType() == QueryNode.TYPE_NOT) {
// is null expression
RelationQueryNode isNull
= factory.createRelationQueryNode(queryNode,
RelationQueryNode.OPERATION_NULL);
applyRelativePath(isNull);
node.childrenAccept(this, isNull);
NotQueryNode notNode = (NotQueryNode) queryNode;
NAryQueryNode parent = (NAryQueryNode) notNode.getParent();
parent.removeOperand(notNode);
parent.addOperand(isNull);
} else {
// not null expression
RelationQueryNode notNull =
factory.createRelationQueryNode(queryNode,
RelationQueryNode.OPERATION_NOT_NULL);
applyRelativePath(notNull);
node.childrenAccept(this, notNull);
((NAryQueryNode) queryNode).addOperand(notNull);
}
} else {
if (queryNode.getType() == QueryNode.TYPE_PATH) {
createLocationStep(node, (NAryQueryNode) queryNode);
} else if (queryNode.getType() == QueryNode.TYPE_TEXTSEARCH
|| queryNode.getType() == QueryNode.TYPE_RELATION) {
node.childrenAccept(this, queryNode);
} else {
// step within a predicate
RelationQueryNode tmp = factory.createRelationQueryNode(
null, RelationQueryNode.OPERATION_NOT_NULL);
node.childrenAccept(this, tmp);
if (tmpRelPath == null) {
tmpRelPath = new PathBuilder();
}
PathQueryNode relPath = tmp.getRelativePath();
LocationStepQueryNode[] steps = relPath.getPathSteps();
Name nameTest = steps[steps.length-1].getNameTest();
if (nameTest==null) {
// see LocationStepQueryNode javadoc on when getNameTest()==null: when it was a star (asterisk)
nameTest = RelationQueryNode.STAR_NAME_TEST;
}
tmpRelPath.addLast(nameTest);
}
}
break;
case JJTNAMETEST:
if (queryNode.getType() == QueryNode.TYPE_LOCATION
|| queryNode.getType() == QueryNode.TYPE_DEREF
|| queryNode.getType() == QueryNode.TYPE_RELATION
|| queryNode.getType() == QueryNode.TYPE_TEXTSEARCH
|| queryNode.getType() == QueryNode.TYPE_PATH) {
createNodeTest(node, queryNode);
} else if (queryNode.getType() == QueryNode.TYPE_ORDER) {
setOrderSpecPath(node, (OrderQueryNode) queryNode);
} else {
// traverse
node.childrenAccept(this, queryNode);
}
break;
case JJTELEMENTNAMEORWILDCARD:
if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
SimpleNode child = (SimpleNode) node.jjtGetChild(0);
if (child.getId() != JJTANYNAME) {
createNodeTest(child, queryNode);
}
}
break;
case JJTTEXTTEST:
if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
LocationStepQueryNode loc = (LocationStepQueryNode) queryNode;
loc.setNameTest(JCR_XMLTEXT);
}
break;
case JJTTYPENAME:
if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
LocationStepQueryNode loc = (LocationStepQueryNode) queryNode;
String ntName = ((SimpleNode) node.jjtGetChild(0)).getValue();
try {
Name nt = resolver.getQName(ntName);
NodeTypeQueryNode nodeType = factory.createNodeTypeQueryNode(loc, nt);
loc.addPredicate(nodeType);
} catch (NameException e) {
exceptions.add(new InvalidQueryException("Not a valid name: " + ntName));
} catch (NamespaceException e) {
exceptions.add(new InvalidQueryException("Not a valid name: " + ntName));
}
}
break;
case JJTOREXPR:
NAryQueryNode parent = (NAryQueryNode) queryNode;
QueryNode orQueryNode = factory.createOrQueryNode(parent);
parent.addOperand(orQueryNode);
// traverse
node.childrenAccept(this, orQueryNode);
break;
case JJTANDEXPR:
parent = (NAryQueryNode) queryNode;
QueryNode andQueryNode = factory.createAndQueryNode(parent);
parent.addOperand(andQueryNode);
// traverse
node.childrenAccept(this, andQueryNode);
break;
case JJTCOMPARISONEXPR: