/*
* Copyright 2004-2005 The Apache Software Foundation or its licensors,
* as applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.core.query.xpath;
import org.apache.jackrabbit.core.SearchManager;
import org.apache.jackrabbit.core.query.AndQueryNode;
import org.apache.jackrabbit.core.query.DerefQueryNode;
import org.apache.jackrabbit.core.query.LocationStepQueryNode;
import org.apache.jackrabbit.core.query.NAryQueryNode;
import org.apache.jackrabbit.core.query.NodeTypeQueryNode;
import org.apache.jackrabbit.core.query.NotQueryNode;
import org.apache.jackrabbit.core.query.OrQueryNode;
import org.apache.jackrabbit.core.query.OrderQueryNode;
import org.apache.jackrabbit.core.query.PathQueryNode;
import org.apache.jackrabbit.core.query.QueryConstants;
import org.apache.jackrabbit.core.query.QueryNode;
import org.apache.jackrabbit.core.query.QueryRootNode;
import org.apache.jackrabbit.core.query.RelationQueryNode;
import org.apache.jackrabbit.core.query.TextsearchQueryNode;
import org.apache.jackrabbit.name.IllegalNameException;
import org.apache.jackrabbit.name.NamespaceResolver;
import org.apache.jackrabbit.name.NoPrefixDeclaredException;
import org.apache.jackrabbit.name.QName;
import org.apache.jackrabbit.name.UnknownPrefixException;
import org.apache.jackrabbit.util.ISO8601;
import org.apache.jackrabbit.util.ISO9075;
import org.apache.commons.collections.map.ReferenceMap;
import javax.jcr.query.InvalidQueryException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.Map;
/**
* Query builder that translates a XPath statement into a query tree structure.
*/
public class XPathQueryBuilder implements XPathVisitor, XPathTreeConstants {
/**
* QName for 'fn:not'
*/
static final QName FN_NOT = new QName(SearchManager.NS_FN_URI, "not");
/**
* QName for 'not' as defined in XPath 1.0 (no prefix)
*/
static final QName FN_NOT_10 = new QName("", "not");
/**
* QName for true function.
*/
static final QName FN_TRUE = new QName("", "true");
/**
* QName for false function.
*/
static final QName FN_FALSE = new QName("", "false");
/**
* QName for position function.
*/
static final QName FN_POSITION = new QName("", "position");
/**
* QName for element function.
*/
static final QName FN_ELEMENT = new QName("", "element");
/**
* QName for the full position function including bracket
*/
static final QName FN_POSITION_FULL = new QName("", "position()");
/**
* QName for jcr:xmltext
*/
static final QName JCR_XMLTEXT = new QName(QName.NS_JCR_URI, "xmltext");
/**
* QName for last function.
*/
static final QName FN_LAST = new QName("", "last");
/**
* QName for first function.
*/
static final QName FN_FIRST = new QName("", "first");
/**
* QName for xs:dateTime
*/
static final QName XS_DATETIME = new QName(SearchManager.NS_XS_URI, "dateTime");
/**
* QName for jcr:like
*/
static final QName JCR_LIKE = new QName(QName.NS_JCR_URI, "like");
/**
* QName for jcr:deref
*/
static final QName JCR_DEREF = new QName(QName.NS_JCR_URI, "deref");
/**
* QName for jcr:contains
*/
static final QName JCR_CONTAINS = new QName(QName.NS_JCR_URI, "contains");
/**
* QName for jcr:root
*/
static final QName JCR_ROOT = new QName(QName.NS_JCR_URI, "root");
/**
* QName for jcr:score
*/
static final QName JCR_SCORE = new QName(QName.NS_JCR_URI, "score");
/**
* String constant for operator 'eq'
*/
private static final String OP_EQ = "eq";
/**
* String constant for operator 'ne'
*/
private static final String OP_NE = "ne";
/**
* String constant for operator 'gt'
*/
private static final String OP_GT = "gt";
/**
* String constant for operator 'ge'
*/
private static final String OP_GE = "ge";
/**
* String constant for operator 'lt'
*/
private static final String OP_LT = "lt";
/**
* String constant for operator 'le'
*/
private static final String OP_LE = "le";
/**
* String constant for operator '='
*/
private static final String OP_SIGN_EQ = "=";
/**
* String constant for operator '!='
*/
private static final String OP_SIGN_NE = "!=";
/**
* String constant for operator '>'
*/
private static final String OP_SIGN_GT = ">";
/**
* String constant for operator '>='
*/
private static final String OP_SIGN_GE = ">=";
/**
* String constant for operator '<'
*/
private static final String OP_SIGN_LT = "<";
/**
* String constant for operator '<='
*/
private static final String OP_SIGN_LE = "<=";
/**
* Map of reusable XPath parser instances indexed by NamespaceResolver.
*/
private static Map parsers = new ReferenceMap(ReferenceMap.WEAK, ReferenceMap.WEAK);
/**
* The root <code>QueryNode</code>
*/
private final QueryRootNode root = new QueryRootNode();
/**
* The {@link NamespaceResolver} in use
*/
private final NamespaceResolver resolver;
/**
* List of exceptions that are created while building the query tree
*/
private final List exceptions = new ArrayList();
/**
* Creates a new <code>XPathQueryBuilder</code> instance.
*
* @param statement the XPath statement.
* @param resolver the namespace resolver to use.
* @throws InvalidQueryException if the XPath statement is malformed.
*/
private XPathQueryBuilder(String statement, NamespaceResolver resolver)
throws InvalidQueryException {
this.resolver = resolver;
try {
// create an XQuery statement because we're actually using an
// XQuery parser.
statement = "for $v in " + statement + " return $v";
// get parser
XPath parser;
synchronized (parsers) {
parser = (XPath) parsers.get(resolver);
if (parser == null) {
parser = new XPath(new StringReader(statement));
parsers.put(resolver, parser);
}
}
SimpleNode query;
// guard against concurrent use within same session
synchronized (parser) {
parser.ReInit(new StringReader(statement));
query = parser.XPath2();
}
query.jjtAccept(this, root);
} catch (ParseException e) {
throw new InvalidQueryException(e.getMessage(), e);
} catch (Throwable t) {
// also catch any other exception
throw new InvalidQueryException(t.getMessage(), t);
}
if (exceptions.size() > 0) {
// simply report the first one
Exception e = (Exception) exceptions.get(0);
if (e instanceof InvalidQueryException) {
// just re-throw
throw (InvalidQueryException) e;
} else {
// otherwise package
throw new InvalidQueryException(e.getMessage(), e);
}
}
}
/**
* Creates a <code>QueryNode</code> tree from a XPath statement.
*
* @param statement the XPath statement.
* @param resolver the namespace resolver to use.
* @return the <code>QueryNode</code> tree for the XPath statement.
* @throws InvalidQueryException if the XPath statement is malformed.
*/
public static QueryRootNode createQuery(String statement,
NamespaceResolver resolver)
throws InvalidQueryException {
QueryRootNode root = new XPathQueryBuilder(statement, resolver).getRootNode();
return root;
}
/**
* Creates a String representation of the query node tree in XPath syntax.
*
* @param root the root of the query node tree.
* @param resolver to resolve QNames.
* @return a String representation of the query node tree.
* @throws InvalidQueryException if the query node tree cannot be converted
* into a String representation due to restrictions in XPath.
*/
public static String toString(QueryRootNode root, NamespaceResolver resolver)
throws InvalidQueryException {
return QueryFormat.toString(root, resolver);
}
/**
* Returns the root node of the <code>QueryNode</code> tree.
*
* @return the root node of the <code>QueryNode</code> tree.
*/
QueryRootNode getRootNode() {
return root;
}
//---------------------< 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:
((PathQueryNode) queryNode).setAbsolute(true);
break;
case JJTSTEPEXPR:
if (isAttributeAxis(node)) {
if (queryNode.getType() == QueryNode.TYPE_RELATION
|| queryNode.getType() == QueryNode.TYPE_DEREF
|| 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
= new RelationQueryNode(queryNode,
RelationQueryNode.OPERATION_NULL);
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
= new RelationQueryNode(queryNode,
RelationQueryNode.OPERATION_NOT_NULL);
node.childrenAccept(this, notNull);
((NAryQueryNode) queryNode).addOperand(notNull);
}
} else {
if (queryNode.getType() == QueryNode.TYPE_PATH) {
queryNode = createLocationStep(node, (NAryQueryNode) queryNode);
} else if (queryNode.getType() == QueryNode.TYPE_TEXTSEARCH) {
// ignore
} else {
exceptions.add(new InvalidQueryException("Only attribute axis is allowed in predicate"));
}
}
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) {
createOrderSpec(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 {
QName nt = QName.fromJCRName(ntName, resolver);
NodeTypeQueryNode nodeType = new NodeTypeQueryNode(loc, nt);
loc.addPredicate(nodeType);
} catch (IllegalNameException e) {
exceptions.add(new InvalidQueryException("Not a valid name: " + ntName));
} catch (UnknownPrefixException e) {
exceptions.add(new InvalidQueryException("Unknown prefix in name: " + ntName));
}
}
break;
case JJTOREXPR:
NAryQueryNode parent = (NAryQueryNode) queryNode;
queryNode = new OrQueryNode(parent);
parent.addOperand(queryNode);
// traverse
node.childrenAccept(this, queryNode);
break;
case JJTANDEXPR:
parent = (NAryQueryNode) queryNode;
queryNode = new AndQueryNode(parent);
parent.addOperand(queryNode);
// traverse
node.childrenAccept(this, queryNode);
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(new OrderQueryNode(root));
queryNode = root.getOrderNode();
node.childrenAccept(this, queryNode);
break;
case JJTORDERMODIFIER:
if (node.jjtGetNumChildren() > 0
&& ((SimpleNode) node.jjtGetChild(0)).getId() == JJTDESCENDING) {
OrderQueryNode.OrderSpec[] specs = ((OrderQueryNode) queryNode).getOrderSpecs();
specs[specs.length - 1].setAscending(false);
}
break;
default:
// per default traverse
node.childrenAccept(this, queryNode);
}
return queryNode;
}
//----------------------< internal >----------------------------------------
/**
* Creates a <code>LocationStepQueryNode</code> at the current position
* in parent.
*
* @param node the current node in the xpath syntax tree.
* @param parent the parent <code>PathQueryNode</code>.
* @return the created <code>LocationStepQueryNode</code>.
*/
private LocationStepQueryNode createLocationStep(SimpleNode node, NAryQueryNode parent) {
LocationStepQueryNode queryNode = null;
boolean descenant = false;
Node p = node.jjtGetParent();
for (int i = 0; i < p.jjtGetNumChildren(); i++) {
SimpleNode c = (SimpleNode) p.jjtGetChild(i);
if (c == node) {
queryNode = new LocationStepQueryNode(parent, null, descenant);
parent.addOperand(queryNode);
break;
}
descenant = (c.getId() == JJTSLASHSLASH
|| c.getId() == JJTROOTDESCENDANTS);
}
node.childrenAccept(this, queryNode);
return queryNode;
}
/**
* Assigns a QName to one of the follwing QueryNodes:
* {@link RelationQueryNode}, {@link DerefQueryNode}, {@link RelationQueryNode},
* {@link PathQueryNode}, {@link OrderQueryNode}, {@link TextsearchQueryNode}.
*
* @param node the current node in the xpath syntax tree.
* @param queryNode the query node.
*/
private void createNodeTest(SimpleNode node, QueryNode queryNode) {
if (node.jjtGetNumChildren() > 0) {
SimpleNode child = (SimpleNode) node.jjtGetChild(0);
if (child.getId() == JJTQNAME || child.getId() == JJTQNAMEFORITEMTYPE) {
try {
if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
QName name = ISO9075.decode(QName.fromJCRName(child.getValue(), resolver));
if (name.equals(JCR_ROOT)) {
name = LocationStepQueryNode.EMPTY_NAME;
}
((LocationStepQueryNode) queryNode).setNameTest(name);
} else if (queryNode.getType() == QueryNode.TYPE_DEREF) {
QName name = ISO9075.decode(QName.fromJCRName(child.getValue(), resolver));
((DerefQueryNode) queryNode).setRefProperty(name);
} else if (queryNode.getType() == QueryNode.TYPE_RELATION) {
QName name = ISO9075.decode(QName.fromJCRName(child.getValue(), resolver));
((RelationQueryNode) queryNode).setProperty(name);
} else if (queryNode.getType() == QueryNode.TYPE_PATH) {
QName name = ISO9075.decode(QName.fromJCRName(child.getValue(), resolver));
root.addSelectProperty(name);
} else if (queryNode.getType() == QueryNode.TYPE_ORDER) {
QName name = ISO9075.decode(QName.fromJCRName(child.getValue(), resolver));
root.getOrderNode().addOrderSpec(name, true);
} else if (queryNode.getType() == QueryNode.TYPE_TEXTSEARCH) {
QName name = ISO9075.decode(QName.fromJCRName(child.getValue(), resolver));
((TextsearchQueryNode) queryNode).setPropertyName(name);
}
} catch (IllegalNameException e) {
exceptions.add(new InvalidQueryException("Illegal name: " + child.getValue()));
} catch (UnknownPrefixException e) {
exceptions.add(new InvalidQueryException("Unknown prefix: " + child.getValue()));
}
} else if (child.getId() == JJTSTAR) {
if (queryNode.getType() == QueryNode.TYPE_LOCATION) {
((LocationStepQueryNode) queryNode).setNameTest(null);
}
} else {
exceptions.add(new InvalidQueryException("Unsupported location for name test: " + child));
}
}
}
/**
* Creates a new {@link org.apache.jackrabbit.core.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()));
}
RelationQueryNode rqn = new RelationQueryNode(queryNode, type);
// traverse
node.childrenAccept(this, rqn);
queryNode.addOperand(rqn);
}
/**
* Creates the primary path query node.
*
* @param node xpath node representing the root of the parsed tree.
* @return
*/
private PathQueryNode createPathQueryNode(SimpleNode node) {
root.setLocationNode(new PathQueryNode(root));
node.childrenAccept(this, root.getLocationNode());
return root.getLocationNode();
}
/**
* Assigns a value to the <code>queryNode</code>.
*
* @param node must be of type string, decimal, double or integer; otherwise
* an InvalidQueryException is added to {@link #exceptions}.
* @param queryNode current node in the query tree.
*/
private void assignValue(SimpleNode node, RelationQueryNode queryNode) {
if (node.getId() == JJTSTRINGLITERAL) {
queryNode.setStringValue(unescapeQuotes(node.getValue()));
} else if (node.getId() == JJTDECIMALLITERAL) {
queryNode.setDoubleValue(Double.parseDouble(node.getValue()));
} else if (node.getId() == JJTDOUBLELITERAL) {
queryNode.setDoubleValue(Double.parseDouble(node.getValue()));
} else if (node.getId() == JJTINTEGERLITERAL) {
// if this is an expression that contains position() do not change
// the type.
if (queryNode.getValueType() == QueryConstants.TYPE_POSITION) {
queryNode.setPositionValue(Integer.parseInt(node.getValue()));
} else {
queryNode.setLongValue(Long.parseLong(node.getValue()));
}
} else {
exceptions.add(new InvalidQueryException("Unsupported literal type:" + node.toString()));
}
}
/**
* Creates a function based on <code>node</code>.
*
* @param node the function node from the xpath tree.
* @param queryNode the current query node.
* @return
*/
private QueryNode createFunction(SimpleNode node, QueryNode queryNode) {
// find out function name
String fName = ((SimpleNode) node.jjtGetChild(0)).getValue();
fName = fName.substring(0, fName.length() - 1);
try {
if (FN_NOT.toJCRName(resolver).equals(fName)
|| FN_NOT_10.toJCRName(resolver).equals(fName)) {
if (queryNode instanceof NAryQueryNode) {
QueryNode not = new NotQueryNode(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.toJCRName(resolver).equals(fName)) {
// 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.toJCRName(resolver).equals(fName)) {
// 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 = new TextsearchQueryNode(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.toJCRName(resolver).equals(fName)) {
// check number of arguments
if (node.jjtGetNumChildren() == 3) {
if (queryNode instanceof NAryQueryNode) {
RelationQueryNode like = new RelationQueryNode(queryNode, RelationQueryNode.OPERATION_LIKE);
((NAryQueryNode) queryNode).addOperand(like);
// assign property name
node.jjtGetChild(1).jjtAccept(this, like);
// check property name
if (like.getProperty() == 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.toJCRName(resolver).equals(fName)) {
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.toJCRName(resolver).equals(fName)) {
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.toJCRName(resolver).equals(fName)) {
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 furhter parsed.
rel.setPositionValue(1);
rel.setProperty(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.toJCRName(resolver).equals(fName)) {
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.toJCRName(resolver).equals(fName)) {
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.toJCRName(resolver).equals(fName)) {
// check number of arguments
if (node.jjtGetNumChildren() == 3) {
if (queryNode.getType() == QueryNode.TYPE_PATH) {
PathQueryNode pathNode = (PathQueryNode) queryNode;
DerefQueryNode derefNode = new DerefQueryNode(pathNode, null, false);
// assign property name
node.jjtGetChild(1).jjtAccept(this, derefNode);
// check property name
if (derefNode.getRefProperty() == null) {
exceptions.add(new InvalidQueryException("Wrong first argument type for jcr:deref"));
}
SimpleNode literal = (SimpleNode) node.jjtGetChild(2).jjtGetChild(0);
if (literal.getId() == JJTSTRINGLITERAL) {
String value = literal.getValue();
// strip quotes
value = value.substring(1, value.length() - 1);
if (!value.equals("*")) {
QName name = null;
try {
name = ISO9075.decode(QName.fromJCRName(value, resolver));
} catch (IllegalNameException e) {
exceptions.add(new InvalidQueryException("Illegal name: " + value));
} catch (UnknownPrefixException e) {
exceptions.add(new InvalidQueryException("Unknown prefix: " + value));
}
derefNode.setNameTest(name);
}
} else {
exceptions.add(new InvalidQueryException("Wrong second argument type for jcr:like"));
}
pathNode.addPathStep(derefNode);
} else {
exceptions.add(new InvalidQueryException("Unsupported location for jcr:deref()"));
}
}
} else if (JCR_SCORE.toJCRName(resolver).equals(fName)) {
if (queryNode.getType() == QueryNode.TYPE_ORDER) {
createOrderSpec(node, (OrderQueryNode) queryNode);
} else {
exceptions.add(new InvalidQueryException("Unsupported location for jcr:score()"));
}
} else {
exceptions.add(new InvalidQueryException("Unsupported function: " + fName));
}
} catch (NoPrefixDeclaredException e) {
exceptions.add(e);
}
return queryNode;
}
private OrderQueryNode.OrderSpec createOrderSpec(SimpleNode node,
OrderQueryNode queryNode) {
SimpleNode child = (SimpleNode) node.jjtGetChild(0);
OrderQueryNode.OrderSpec spec = null;
try {
String propName = child.getValue();
if (child.getId() == JJTQNAMELPAR) {
// function name
// cut off left parenthesis at end
propName.substring(0, propName.length() - 1);
}
QName name = ISO9075.decode(QName.fromJCRName(propName, resolver));
spec = new OrderQueryNode.OrderSpec(name, true);
queryNode.addOrderSpec(spec);
} catch (IllegalNameException e) {
exceptions.add(new InvalidQueryException("Illegal name: " + child.getValue()));
} catch (UnknownPrefixException e) {
exceptions.add(new InvalidQueryException("Unknown prefix: " + child.getValue()));
}
return spec;
}
/**
* Returns true if <code>node</code> has a child node which is the attribute
* axis.
*
* @param node a node with type {@link org.apache.jackrabbit.core.query.xpath.XPathTreeConstants.JJTSTEPEXPR}.
* @return <code>true</code> if this step expression uses the attribute axis.
*/
private boolean isAttributeAxis(SimpleNode node) {
for (int i = 0; i < node.jjtGetNumChildren(); i++) {
if (((SimpleNode) node.jjtGetChild(i)).getId() == JJTAT) {
return true;
}
}
return false;
}
/**
* Unescapes single or double quotes depending on how <code>literal</code>
* is enclosed and strips enclosing quotes.
*
* </p>
* Examples:</br>
* <code>"foo""bar"</code> -> <code>foo"bar</code></br>
* <code>'foo''bar'</code> -> <code>foo'bar</code></br>
* but:</br>
* <code>'foo""bar'</code> -> <code>foo""bar</code>
*
* @param literal the string literal to unescape
* @return the unescaped and stripped literal.
*/
private String unescapeQuotes(String literal) {
String value = literal.substring(1, literal.length() - 1);
if (value.length() == 0) {
// empty string
return value;
}
if (literal.charAt(0) == '"') {
value = value.replaceAll("\"\"", "\"");
} else {
value = value.replaceAll("''", "'");
}
return value;
}
}