Examples with RelationQueryNode org.apache.jackrabbit.spi.commons.query.RelationQueryNode used on opensource projects

Example 1 with RelationQueryNode

use of org.apache.jackrabbit.spi.commons.query.RelationQueryNode in project jackrabbit by apache.

the class XPathQueryBuilder method visit.

//---------------------< XPathVisitor >-------------------------------------
/**
     * Implements the generic visit method for this <code>XPathVisitor</code>.
     *
     * @param node the current node as created by the XPath parser.
     * @param data the current <code>QueryNode</code> created by this
     *             <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:
            createExpression(node, (NAryQueryNode) queryNode);
            break;
        case JJTSTRINGLITERAL:
        case JJTDECIMALLITERAL:
        case JJTDOUBLELITERAL:
        case JJTINTEGERLITERAL:
            if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                assignValue(node, (RelationQueryNode) queryNode);
            } else if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
                if (node.getId() == JJTINTEGERLITERAL) {
                    int index = Integer.parseInt(node.getValue());
                    ((LocationStepQueryNode) queryNode).setIndex(index);
                } else {
                    exceptions.add(new InvalidQueryException("LocationStep only allows integer literal as position index"));
                }
            } else {
                exceptions.add(new InvalidQueryException("Parse error: data is not a RelationQueryNode"));
            }
            break;
        case JJTUNARYMINUS:
            if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                ((RelationQueryNode) queryNode).setUnaryMinus(true);
            } else {
                exceptions.add(new InvalidQueryException("Parse error: data is not a RelationQueryNode"));
            }
            break;
        case JJTFUNCTIONCALL:
            queryNode = createFunction(node, queryNode);
            break;
        case JJTORDERBYCLAUSE:
            root.setOrderNode(factory.createOrderQueryNode(root));
            queryNode = root.getOrderNode();
            node.childrenAccept(this, queryNode);
            break;
        case JJTORDERSPEC:
            OrderQueryNode orderQueryNode = (OrderQueryNode) queryNode;
            orderQueryNode.newOrderSpec();
            node.childrenAccept(this, queryNode);
            if (!orderQueryNode.isValid()) {
                exceptions.add(new InvalidQueryException("Invalid order specification. (Missing @?)"));
            }
            break;
        case JJTORDERMODIFIER:
            if (node.jjtGetNumChildren() > 0 && ((SimpleNode) node.jjtGetChild(0)).getId() == JJTDESCENDING) {
                ((OrderQueryNode) queryNode).setAscending(false);
            }
            break;
        case JJTPREDICATELIST:
            if (queryNode.getType() == QueryNode.TYPE_PATH) {
                // switch to last location
                QueryNode[] operands = ((PathQueryNode) queryNode).getOperands();
                queryNode = operands[operands.length - 1];
            }
            node.childrenAccept(this, queryNode);
            break;
        case JJTPREDICATE:
            if (queryNode.getType() == QueryNode.TYPE_LOCATION || queryNode.getType() == QueryNode.TYPE_DEREF) {
                node.childrenAccept(this, queryNode);
            } else {
                // predicate not allowed here
                exceptions.add(new InvalidQueryException("Unsupported location for predicate"));
            }
            break;
        case JJTDOTDOT:
            if (queryNode instanceof LocationStepQueryNode) {
                ((LocationStepQueryNode) queryNode).setNameTest(PATH_FACTORY.getParentElement().getName());
            } else {
                ((RelationQueryNode) queryNode).addPathElement(PATH_FACTORY.getParentElement());
            }
            break;
        default:
            // per default traverse
            node.childrenAccept(this, queryNode);
    }
    return queryNode;
}

Example 2 with RelationQueryNode

use of org.apache.jackrabbit.spi.commons.query.RelationQueryNode in project jackrabbit by apache.

the class XPathQueryBuilder method createExpression.

/**
     * Creates a new {@link org.apache.jackrabbit.spi.commons.query.RelationQueryNode}
     * with <code>queryNode</code> as its parent node.
     *
     * @param node      a comparison expression node.
     * @param queryNode the current <code>QueryNode</code>.
     */
private void createExpression(SimpleNode node, NAryQueryNode queryNode) {
    if (node.getId() != JJTCOMPARISONEXPR) {
        throw new IllegalArgumentException("node must be of type ComparisonExpr");
    }
    // get operation type
    String opType = node.getValue();
    int type = 0;
    if (opType.equals(OP_EQ)) {
        type = RelationQueryNode.OPERATION_EQ_VALUE;
    } else if (opType.equals(OP_SIGN_EQ)) {
        type = RelationQueryNode.OPERATION_EQ_GENERAL;
    } else if (opType.equals(OP_GT)) {
        type = RelationQueryNode.OPERATION_GT_VALUE;
    } else if (opType.equals(OP_SIGN_GT)) {
        type = RelationQueryNode.OPERATION_GT_GENERAL;
    } else if (opType.equals(OP_GE)) {
        type = RelationQueryNode.OPERATION_GE_VALUE;
    } else if (opType.equals(OP_SIGN_GE)) {
        type = RelationQueryNode.OPERATION_GE_GENERAL;
    } else if (opType.equals(OP_LE)) {
        type = RelationQueryNode.OPERATION_LE_VALUE;
    } else if (opType.equals(OP_SIGN_LE)) {
        type = RelationQueryNode.OPERATION_LE_GENERAL;
    } else if (opType.equals(OP_LT)) {
        type = RelationQueryNode.OPERATION_LT_VALUE;
    } else if (opType.equals(OP_SIGN_LT)) {
        type = RelationQueryNode.OPERATION_LT_GENERAL;
    } else if (opType.equals(OP_NE)) {
        type = RelationQueryNode.OPERATION_NE_VALUE;
    } else if (opType.equals(OP_SIGN_NE)) {
        type = RelationQueryNode.OPERATION_NE_GENERAL;
    } else {
        exceptions.add(new InvalidQueryException("Unsupported ComparisonExpr type:" + node.getValue()));
    }
    final RelationQueryNode rqn = factory.createRelationQueryNode(queryNode, type);
    // traverse
    node.childrenAccept(this, rqn);
    // check if string transformation is valid
    try {
        rqn.acceptOperands(new DefaultQueryNodeVisitor() {

            public Object visit(PropertyFunctionQueryNode node, Object data) {
                String functionName = node.getFunctionName();
                if ((functionName.equals(PropertyFunctionQueryNode.LOWER_CASE) || functionName.equals(PropertyFunctionQueryNode.UPPER_CASE)) && rqn.getValueType() != QueryConstants.TYPE_STRING) {
                    String msg = "Upper and lower case function are only supported with String literals";
                    exceptions.add(new InvalidQueryException(msg));
                }
                return data;
            }
        }, null);
    } catch (RepositoryException e) {
        exceptions.add(e);
    }
    queryNode.addOperand(rqn);
}

Example 3 with RelationQueryNode

use of org.apache.jackrabbit.spi.commons.query.RelationQueryNode in project jackrabbit by apache.

the class JCRSQLQueryBuilder method visit.

public Object visit(ASTLowerFunction node, Object data) {
    RelationQueryNode parent = (RelationQueryNode) data;
    if (parent.getValueType() != QueryConstants.TYPE_STRING) {
        String msg = "LOWER() function is only supported for String literal";
        throw new IllegalArgumentException(msg);
    }
    parent.addOperand(factory.createPropertyFunctionQueryNode(parent, PropertyFunctionQueryNode.LOWER_CASE));
    return parent;
}

Example 4 with RelationQueryNode

use of org.apache.jackrabbit.spi.commons.query.RelationQueryNode in project jackrabbit by apache.

the class LuceneQueryBuilder method visit.

public Object visit(LocationStepQueryNode node, Object data) throws RepositoryException {
    Query context = (Query) data;
    BooleanQuery andQuery = new BooleanQuery();
    if (context == null) {
        exceptions.add(new IllegalArgumentException("Unsupported query"));
    }
    // predicate on step?
    Object[] predicates = node.acceptOperands(this, data);
    for (Object predicate : predicates) {
        andQuery.add((Query) predicate, Occur.MUST);
    }
    // check for position predicate
    QueryNode[] pred = node.getPredicates();
    for (QueryNode aPred : pred) {
        if (aPred.getType() == QueryNode.TYPE_RELATION) {
            RelationQueryNode pos = (RelationQueryNode) aPred;
            if (pos.getValueType() == QueryConstants.TYPE_POSITION) {
                node.setIndex(pos.getPositionValue());
            }
        }
    }
    NameQuery nameTest = null;
    if (node.getNameTest() != null) {
        if (node.getNameTest().equals(PARENT_ELEMENT_NAME)) {
            andQuery.add(new ParentAxisQuery(context, null, indexFormatVersion, nsMappings), Occur.MUST);
            return andQuery;
        }
        nameTest = new NameQuery(node.getNameTest(), indexFormatVersion, nsMappings);
    }
    if (node.getIncludeDescendants()) {
        if (nameTest != null) {
            andQuery.add(new DescendantSelfAxisQuery(context, nameTest, false), Occur.MUST);
        } else {
            // descendant-or-self with nametest=*
            if (predicates.length > 0) {
                // if we have a predicate attached, the condition acts as
                // the sub query.
                // only use descendant axis if path is not //*
                // otherwise the query for the predicate can be used itself
                PathQueryNode pathNode = (PathQueryNode) node.getParent();
                if (pathNode.getPathSteps()[0] != node) {
                    Query subQuery = new DescendantSelfAxisQuery(context, andQuery, false);
                    andQuery = new BooleanQuery();
                    andQuery.add(subQuery, Occur.MUST);
                }
            } else {
                // todo this will traverse the whole index, optimize!
                // only use descendant axis if path is not //*
                PathQueryNode pathNode = (PathQueryNode) node.getParent();
                if (pathNode.getPathSteps()[0] != node) {
                    if (node.getIndex() == LocationStepQueryNode.NONE) {
                        context = new DescendantSelfAxisQuery(context, false);
                        andQuery.add(context, Occur.MUST);
                    } else {
                        context = new DescendantSelfAxisQuery(context, true);
                        andQuery.add(new ChildAxisQuery(sharedItemMgr, context, null, node.getIndex(), indexFormatVersion, nsMappings), Occur.MUST);
                    }
                } else {
                    andQuery.add(new MatchAllDocsQuery(), Occur.MUST);
                }
            }
        }
    } else {
        // name test
        if (nameTest != null) {
            andQuery.add(new ChildAxisQuery(sharedItemMgr, context, nameTest.getName(), node.getIndex(), indexFormatVersion, nsMappings), Occur.MUST);
        } else {
            // select child nodes
            andQuery.add(new ChildAxisQuery(sharedItemMgr, context, null, node.getIndex(), indexFormatVersion, nsMappings), Occur.MUST);
        }
    }
    return andQuery;
}

Example 5 with RelationQueryNode

use of org.apache.jackrabbit.spi.commons.query.RelationQueryNode in project jackrabbit by apache.

the class XPathQueryBuilder method createFunction.

/**
     * Creates a function based on <code>node</code>.
     *
     * @param node      the function node from the xpath tree.
     * @param queryNode the current query node.
     * @return the function node
     */
private QueryNode createFunction(SimpleNode node, QueryNode queryNode) {
    // find out function name
    String tmp = ((SimpleNode) node.jjtGetChild(0)).getValue();
    String fName = tmp.substring(0, tmp.length() - 1);
    try {
        Name funName = resolver.getQName(fName);
        if (FN_NOT.equals(funName) || FN_NOT_10.equals(funName)) {
            if (queryNode instanceof NAryQueryNode) {
                QueryNode not = factory.createNotQueryNode(queryNode);
                ((NAryQueryNode) queryNode).addOperand(not);
                // @todo is this needed?
                queryNode = not;
                // traverse
                if (node.jjtGetNumChildren() == 2) {
                    node.jjtGetChild(1).jjtAccept(this, queryNode);
                } else {
                    exceptions.add(new InvalidQueryException("fn:not only supports one expression argument"));
                }
            } else {
                exceptions.add(new InvalidQueryException("Unsupported location for function fn:not"));
            }
        } else if (XS_DATETIME.equals(funName)) {
            // check arguments
            if (node.jjtGetNumChildren() == 2) {
                if (queryNode instanceof RelationQueryNode) {
                    RelationQueryNode rel = (RelationQueryNode) queryNode;
                    SimpleNode literal = (SimpleNode) node.jjtGetChild(1).jjtGetChild(0);
                    if (literal.getId() == JJTSTRINGLITERAL) {
                        String value = literal.getValue();
                        // strip quotes
                        value = value.substring(1, value.length() - 1);
                        Calendar c = ISO8601.parse(value);
                        if (c == null) {
                            exceptions.add(new InvalidQueryException("Unable to parse string literal for xs:dateTime: " + value));
                        } else {
                            rel.setDateValue(c.getTime());
                        }
                    } else {
                        exceptions.add(new InvalidQueryException("Wrong argument type for xs:dateTime"));
                    }
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported location for function xs:dateTime"));
                }
            } else {
                // wrong number of arguments
                exceptions.add(new InvalidQueryException("Wrong number of arguments for xs:dateTime"));
            }
        } else if (JCR_CONTAINS.equals(funName)) {
            // check number of arguments
            if (node.jjtGetNumChildren() == 3) {
                if (queryNode instanceof NAryQueryNode) {
                    SimpleNode literal = (SimpleNode) node.jjtGetChild(2).jjtGetChild(0);
                    if (literal.getId() == JJTSTRINGLITERAL) {
                        TextsearchQueryNode contains = factory.createTextsearchQueryNode(queryNode, unescapeQuotes(literal.getValue()));
                        // assign property name
                        SimpleNode path = (SimpleNode) node.jjtGetChild(1);
                        path.jjtAccept(this, contains);
                        ((NAryQueryNode) queryNode).addOperand(contains);
                    } else {
                        exceptions.add(new InvalidQueryException("Wrong argument type for jcr:contains"));
                    }
                }
            } else {
                // wrong number of arguments
                exceptions.add(new InvalidQueryException("Wrong number of arguments for jcr:contains"));
            }
        } else if (JCR_LIKE.equals(funName)) {
            // check number of arguments
            if (node.jjtGetNumChildren() == 3) {
                if (queryNode instanceof NAryQueryNode) {
                    RelationQueryNode like = factory.createRelationQueryNode(queryNode, RelationQueryNode.OPERATION_LIKE);
                    ((NAryQueryNode) queryNode).addOperand(like);
                    // assign property name
                    node.jjtGetChild(1).jjtAccept(this, like);
                    // check property name
                    if (like.getRelativePath() == null) {
                        exceptions.add(new InvalidQueryException("Wrong first argument type for jcr:like"));
                    }
                    SimpleNode literal = (SimpleNode) node.jjtGetChild(2).jjtGetChild(0);
                    if (literal.getId() == JJTSTRINGLITERAL) {
                        like.setStringValue(unescapeQuotes(literal.getValue()));
                    } else {
                        exceptions.add(new InvalidQueryException("Wrong second argument type for jcr:like"));
                    }
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported location for function jcr:like"));
                }
            } else {
                // wrong number of arguments
                exceptions.add(new InvalidQueryException("Wrong number of arguments for jcr:like"));
            }
        } else if (FN_TRUE.equals(funName)) {
            if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                RelationQueryNode rel = (RelationQueryNode) queryNode;
                rel.setStringValue("true");
            } else {
                exceptions.add(new InvalidQueryException("Unsupported location for true()"));
            }
        } else if (FN_FALSE.equals(funName)) {
            if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                RelationQueryNode rel = (RelationQueryNode) queryNode;
                rel.setStringValue("false");
            } else {
                exceptions.add(new InvalidQueryException("Unsupported location for false()"));
            }
        } else if (FN_POSITION.equals(funName)) {
            if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                RelationQueryNode rel = (RelationQueryNode) queryNode;
                if (rel.getOperation() == RelationQueryNode.OPERATION_EQ_GENERAL) {
                    // set dummy value to set type of relation query node
                    // will be overwritten when the tree is further parsed.
                    rel.setPositionValue(1);
                    rel.addPathElement(PATH_FACTORY.createElement(FN_POSITION_FULL));
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported expression with position(). Only = is supported."));
                }
            } else {
                exceptions.add(new InvalidQueryException("Unsupported location for position()"));
            }
        } else if (FN_FIRST.equals(funName)) {
            if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                ((RelationQueryNode) queryNode).setPositionValue(1);
            } else if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
                ((LocationStepQueryNode) queryNode).setIndex(1);
            } else {
                exceptions.add(new InvalidQueryException("Unsupported location for first()"));
            }
        } else if (FN_LAST.equals(funName)) {
            if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                ((RelationQueryNode) queryNode).setPositionValue(LocationStepQueryNode.LAST);
            } else if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
                ((LocationStepQueryNode) queryNode).setIndex(LocationStepQueryNode.LAST);
            } else {
                exceptions.add(new InvalidQueryException("Unsupported location for last()"));
            }
        } else if (JCR_DEREF.equals(funName)) {
            // check number of arguments
            if (node.jjtGetNumChildren() == 3) {
                boolean descendant = false;
                if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
                    LocationStepQueryNode loc = (LocationStepQueryNode) queryNode;
                    // remember if descendant axis
                    descendant = loc.getIncludeDescendants();
                    queryNode = loc.getParent();
                    ((NAryQueryNode) queryNode).removeOperand(loc);
                }
                if (queryNode.getType() == QueryNode.TYPE_PATH) {
                    PathQueryNode pathNode = (PathQueryNode) queryNode;
                    pathNode.addPathStep(createDerefQueryNode(node, descendant, pathNode));
                } else if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                    RelationQueryNode relNode = (RelationQueryNode) queryNode;
                    DerefQueryNode deref = createDerefQueryNode(node, descendant, relNode.getRelativePath());
                    relNode.getRelativePath().addPathStep(deref);
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported location for jcr:deref()"));
                }
            }
        } else if (JCR_SCORE.equals(funName)) {
            if (queryNode.getType() == QueryNode.TYPE_ORDER) {
                setOrderSpecPath(node, (OrderQueryNode) queryNode);
            } else {
                exceptions.add(new InvalidQueryException("Unsupported location for jcr:score()"));
            }
        } else if (FN_LOWER_CASE.equals(funName)) {
            if (node.jjtGetNumChildren() == 2) {
                if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                    RelationQueryNode relNode = (RelationQueryNode) queryNode;
                    relNode.addOperand(factory.createPropertyFunctionQueryNode(relNode, PropertyFunctionQueryNode.LOWER_CASE));
                    // get property name
                    node.jjtGetChild(1).jjtAccept(this, relNode);
                } else if (queryNode.getType() == QueryNode.TYPE_ORDER) {
                    ((OrderQueryNode) queryNode).setFunction(FN_LOWER_CASE.getLocalName());
                    node.childrenAccept(this, queryNode);
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported location for fn:lower-case()"));
                }
            } else {
                exceptions.add(new InvalidQueryException("Wrong number of argument for fn:lower-case()"));
            }
        } else if (FN_UPPER_CASE.equals(funName)) {
            if (node.jjtGetNumChildren() == 2) {
                if (queryNode.getType() == QueryNode.TYPE_RELATION) {
                    RelationQueryNode relNode = (RelationQueryNode) queryNode;
                    relNode.addOperand(factory.createPropertyFunctionQueryNode(relNode, PropertyFunctionQueryNode.UPPER_CASE));
                    // get property name
                    node.jjtGetChild(1).jjtAccept(this, relNode);
                } else if (queryNode.getType() == QueryNode.TYPE_ORDER) {
                    ((OrderQueryNode) queryNode).setFunction(FN_UPPER_CASE.getLocalName());
                    node.childrenAccept(this, queryNode);
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported location for fn:upper-case()"));
                }
            } else {
                exceptions.add(new InvalidQueryException("Wrong number of argument for fn:upper-case()"));
            }
        } else if (REP_NORMALIZE.equals(funName)) {
            if (node.jjtGetNumChildren() == 2) {
                if (queryNode.getType() == QueryNode.TYPE_ORDER) {
                    ((OrderQueryNode) queryNode).setFunction(REP_NORMALIZE.getLocalName());
                    node.childrenAccept(this, queryNode);
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported location for rep:normalize()"));
                }
            } else {
                exceptions.add(new InvalidQueryException("Wrong number of argument for rep:normalize()"));
            }
        } else if (REP_SIMILAR.equals(funName)) {
            if (node.jjtGetNumChildren() == 3) {
                if (queryNode instanceof NAryQueryNode) {
                    NAryQueryNode parent = (NAryQueryNode) queryNode;
                    RelationQueryNode rel = factory.createRelationQueryNode(parent, RelationQueryNode.OPERATION_SIMILAR);
                    parent.addOperand(rel);
                    // assign path
                    node.jjtGetChild(1).jjtAccept(this, rel);
                    // get path string
                    node.jjtGetChild(2).jjtAccept(this, rel);
                    // check if string is set
                    if (rel.getStringValue() == null) {
                        exceptions.add(new InvalidQueryException("Second argument for rep:similar() must be of type string"));
                    }
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported location for rep:similar()"));
                }
            } else {
                exceptions.add(new InvalidQueryException("Wrong number of arguments for rep:similar()"));
            }
        } else if (REP_SPELLCHECK.equals(funName) && queryNode.getType() != QueryNode.TYPE_PATH) {
            if (node.jjtGetNumChildren() == 2) {
                if (queryNode instanceof NAryQueryNode) {
                    NAryQueryNode parent = (NAryQueryNode) queryNode;
                    RelationQueryNode rel = factory.createRelationQueryNode(parent, RelationQueryNode.OPERATION_SPELLCHECK);
                    parent.addOperand(rel);
                    // get string to check
                    node.jjtGetChild(1).jjtAccept(this, rel);
                    // check if string is set
                    if (rel.getStringValue() == null) {
                        exceptions.add(new InvalidQueryException("Argument for rep:spellcheck() must be of type string"));
                    }
                    // set a dummy property name
                    rel.addPathElement(PATH_FACTORY.createElement(NameConstants.JCR_PRIMARYTYPE));
                } else {
                    exceptions.add(new InvalidQueryException("Unsupported location for rep:spellcheck()"));
                }
            } else {
                exceptions.add(new InvalidQueryException("Wrong number of arguments for rep:spellcheck()"));
            }
        } else if (queryNode.getType() == QueryNode.TYPE_RELATION) {
            // use function name as name of a pseudo property in a relation
            try {
                Name name = resolver.getQName(fName + "()");
                Path.Element element = PATH_FACTORY.createElement(name);
                RelationQueryNode relNode = (RelationQueryNode) queryNode;
                relNode.addPathElement(element);
            } catch (NameException e) {
                exceptions.add(e);
            }
        } else if (queryNode.getType() == QueryNode.TYPE_PATH) {
            // use function name as name of a pseudo property in select clause
            try {
                Name name = resolver.getQName(fName + "()");
                root.addSelectProperty(name);
            } catch (NameException e) {
                exceptions.add(e);
            }
        } else {
            exceptions.add(new InvalidQueryException("Unsupported function: " + fName));
        }
    } catch (NamespaceException e) {
        exceptions.add(e);
    } catch (IllegalNameException e) {
        exceptions.add(e);
    }
    return queryNode;
}