1 package org.apache.lucene.queryParser.core.nodes;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
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14 * distributed under the License is distributed on an "AS IS" BASIS,
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20 import java.util.ArrayList;
21 import java.util.List;
23 import org.apache.lucene.messages.MessageImpl;
24 import org.apache.lucene.queryParser.core.QueryNodeError;
25 import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
26 import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;
29 * A {@link GroupQueryNode} represents a location where the original user typed
30 * real parenthesis on the query string. This class is useful for queries like:
31 * a) a AND b OR c b) ( a AND b) OR c
33 * Parenthesis might be used to define the boolean operation precedence.
35 public class GroupQueryNode extends QueryNodeImpl {
37 private static final long serialVersionUID = -9204673493869114999L;
40 * This QueryNode is used to identify parenthesis on the original query string
42 public GroupQueryNode(QueryNode query) {
44 throw new QueryNodeError(new MessageImpl(
45 QueryParserMessages.PARAMETER_VALUE_NOT_SUPPORTED, "query", "null"));
53 public QueryNode getChild() {
54 return getChildren().get(0);
58 public String toString() {
59 return "<group>" + "\n" + getChild().toString() + "\n</group>";
62 public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
63 if (getChild() == null)
66 return "( " + getChild().toQueryString(escapeSyntaxParser) + " )";
70 public QueryNode cloneTree() throws CloneNotSupportedException {
71 GroupQueryNode clone = (GroupQueryNode) super.cloneTree();
79 public void setChild(QueryNode child) {
80 List<QueryNode> list = new ArrayList<QueryNode>();