content: /*
   * Copyright 2016 The Apache Software Foundation.
   *
   * 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
   *
   *      https://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.avro.io.parsing;
  
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.io.IOException;
  import java.util.HashSet;
  import java.util.Set;
  
  import org.apache.avro.Schema;
  import org.junit.jupiter.api.Test;
  
  /**
   * Unit test to verify that recursive schemas are flattened correctly. See
   * AVRO-1667.
   */
  public class SymbolTest {
  
    private static final String SCHEMA = "{\"type\":\"record\",\"name\":\"SampleNode\","
        + "\"namespace\":\"org.spf4j.ssdump2.avro\",\n" + " \"fields\":[\n"
        + "    {\"name\":\"count\",\"type\":\"int\",\"default\":0},\n" + "    {\"name\":\"subNodes\",\"type\":\n"
        + "       {\"type\":\"array\",\"items\":{\n" + "           \"type\":\"record\",\"name\":\"SamplePair\",\n"
        + "           \"fields\":[\n" + "              {\"name\":\"method\",\"type\":\n"
        + "                  {\"type\":\"record\",\"name\":\"Method\",\n" + "                  \"fields\":[\n"
        + "                     {\"name\":\"declaringClass\",\"type\":{\"type\":\"string\",\"avro.java.string\":\"String\"}},\n"
        + "                     {\"name\":\"methodName\",\"type\":{\"type\":\"string\",\"avro.java.string\":\"String\"}}\n"
        + "                  ]}},\n" + "              {\"name\":\"node\",\"type\":\"SampleNode\"}]}}}]}";
  
    @Test
    void someMethod() throws IOException {
      Schema schema = new Schema.Parser().parse(SCHEMA);
      Symbol root = new ResolvingGrammarGenerator().generate(schema, schema);
      validateNonNull(root, new HashSet<>());
    }
  
    private static void validateNonNull(final Symbol symb, Set<Symbol> seen) {
      if (seen.contains(symb)) {
        return;
      } else {
        seen.add(symb);
      }
      if (symb.production != null) {
        for (Symbol s : symb.production) {
          if (s == null) {
            fail("invalid parsing tree should not contain nulls");
          } else if (s.kind != Symbol.Kind.ROOT) {
            validateNonNull(s, seen);
          }
        }
      }
    }
  }
  