content: /*
   * 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.calcite.rel.metadata;
  
  import com.google.common.collect.ImmutableList;
  
  import org.junit.jupiter.api.Test;
  
  import java.lang.reflect.Method;
  import java.util.List;
  import java.util.SortedMap;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.empty;
  import static org.hamcrest.Matchers.hasSize;
  
  /**
   * Tests for {@link MetadataHandler}.
   */
  class MetadataHandlerTest {
    @Test void findsHandlerMethods() {
      final SortedMap<String, Method> map =
          MetadataHandler.handlerMethods(TestMetadataHandler.class);
      final List<Method> methods = ImmutableList.copyOf(map.values());
  
      assertThat(methods, hasSize(1));
      assertThat(methods.get(0).getName(), is("getTestMetadata"));
    }
  
    @Test void getDefMethodInHandlerIsIgnored() {
      final SortedMap<String, Method> map =
          MetadataHandler.handlerMethods(
              MetadataHandlerWithGetDefMethodOnly.class);
      final List<Method> methods = ImmutableList.copyOf(map.values());
  
      assertThat(methods, empty());
    }
  
    @Test void staticMethodInHandlerIsIgnored() {
      final SortedMap<String, Method> map =
          MetadataHandler.handlerMethods(MetadataHandlerWithStaticMethod.class);
      final List<Method> methods = ImmutableList.copyOf(map.values());
  
      assertThat(methods, empty());
    }
  
    @Test void syntheticMethodInHandlerIsIgnored() {
      final SortedMap<String, Method> map =
          MetadataHandler.handlerMethods(
              TestMetadataHandlers.handlerClassWithSyntheticMethod());
      final List<Method> methods = ImmutableList.copyOf(map.values());
  
      assertThat(methods, empty());
    }
  
    /**
     * {@link MetadataHandler} which has a handler method.
     */
    interface TestMetadataHandler extends MetadataHandler<TestMetadata> {
      @SuppressWarnings("unused")
      TestMetadata getTestMetadata();
    }
  
    /**
     * {@link MetadataHandler} which only has getDef() method.
     */
    interface MetadataHandlerWithGetDefMethodOnly extends MetadataHandler<TestMetadata> {
      MetadataDef<TestMetadata> getDef();
    }
  }
  