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Lucene example source code file (GroupQueryNode.java)

This example Lucene source code file (GroupQueryNode.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

arraylist, charsequence, clonenotsupportedexception, clonenotsupportedexception, groupquerynode, groupquerynode, list, override, override, querynode, querynode, querynodeerror, querynodeimpl, string, util

The Lucene GroupQueryNode.java source code

package org.apache.lucene.queryParser.core.nodes;

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.util.ArrayList;
import java.util.List;

import org.apache.lucene.messages.MessageImpl;
import org.apache.lucene.queryParser.core.QueryNodeError;
import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;

 * A {@link GroupQueryNode} represents a location where the original user typed
 * real parenthesis on the query string. This class is useful for queries like:
 * a) a AND b OR c b) ( a AND b) OR c
 * Parenthesis might be used to define the boolean operation precedence.
public class GroupQueryNode extends QueryNodeImpl {

  private static final long serialVersionUID = -9204673493869114999L;

   * This QueryNode is used to identify parenthesis on the original query string
  public GroupQueryNode(QueryNode query) {
    if (query == null) {
      throw new QueryNodeError(new MessageImpl(
          QueryParserMessages.PARAMETER_VALUE_NOT_SUPPORTED, "query", "null"));


  public QueryNode getChild() {
    return getChildren().get(0);

  public String toString() {
    return "<group>" + "\n" + getChild().toString() + "\n";

  public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
    if (getChild() == null)
      return "";

    return "( " + getChild().toQueryString(escapeSyntaxParser) + " )";

  public QueryNode cloneTree() throws CloneNotSupportedException {
    GroupQueryNode clone = (GroupQueryNode) super.cloneTree();

    return clone;

   * @param child
  public void setChild(QueryNode child) {
    List<QueryNode> list = new ArrayList();


Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene GroupQueryNode.java source code file:

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