/*
 * 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.lucene.queryparser.xml;

import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.lucene.tests.analysis.MockAnalyzer;
import org.apache.lucene.tests.util.LuceneTestCase;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class TestCoreParserDeepNesting extends LuceneTestCase {

  public void testDeeplyNestedBooleanQuery() throws Exception {
    Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
    Element query = doc.createElement("TermQuery");
    query.setAttribute("fieldName", "f");
    query.setTextContent("a");
    for (int i = 0; i < 100_000; i++) {
      Element clause = doc.createElement("Clause");
      clause.setAttribute("occurs", "must");
      clause.appendChild(query);
      query = doc.createElement("BooleanQuery");
      query.appendChild(clause);
    }
    CoreParser parser = new CoreParser("f", new MockAnalyzer(random()));
    // expected: a Query or the declared ParserException; actual: StackOverflowError
    try {
      parser.getQuery(query);
    } catch (@SuppressWarnings("unused") ParserException expected) {
    } catch (StackOverflowError e) {
      throw new AssertionError("expected a Query or ParserException, got StackOverflowError", e);
    }
  }
}