xpathquerybuilder.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.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.core.query.PropertyFunctionQueryNode;
import org.apache.jackrabbit.core.query.DefaultQueryNodeVisitor;
import org.apache.jackrabbit.name.NameException;
import org.apache.jackrabbit.name.NamespaceResolver;
import org.apache.jackrabbit.name.NoPrefixDeclaredException;
import org.apache.jackrabbit.name.QName;
import org.apache.jackrabbit.name.NameFormat;
import org.apache.jackrabbit.name.Path;
import org.apache.jackrabbit.name.MalformedPathException;
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 {

    /**
     * Namespace uri for xpath functions. See also class SearchManager
     */
    static final String NS_FN_URI = "http://www.w3.org/2005/xpath-functions";

    /**
     * QName for 'fn:not'
     */
    static final QName FN_NOT = new QName(NS_FN_URI, "not");

    /**
     * QName for 'fn:lower-case'
     */
    static final QName FN_LOWER_CASE = new QName(NS_FN_URI, "lower-case");

    /**
     * QName for 'fn:upper-case'
     */
    static final QName FN_UPPER_CASE = new QName(NS_FN_URI, "upper-case");

    /**
     * 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("http://www.w3.org/2001/XMLSchema", "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 final 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();

    /**
     * Temporary relative path
     */
    private Path.PathBuilder tmpRelPath;

    /**
     * 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);