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   * 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.cassandra.config;
  
  import java.util.Map;
  import java.util.Set;
  
  import com.google.common.collect.ImmutableSet;
  import com.google.common.collect.Sets;
  import org.junit.Test;
  
  import org.yaml.snakeyaml.introspector.Property;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  public class PropertiesTest
  {
      private final Loader loader = Properties.defaultLoader();
  
      @Test
      public void backAndForth() throws Exception
      {
          Map<String, Property> ps = loader.flatten(Config.class);
  
          Config config = new Config();
          Set<String> keys = ImmutableSet.of("server_encryption_options.enabled",
                                             "client_encryption_options.enabled",
                                             "jmx_encryption_options.enabled",
                                             "server_encryption_options.optional",
                                             "client_encryption_options.optional",
                                             "jmx_encryption_options.optional");
          for (Property prop : ps.values())
          {
              // skip these properties as they don't allow get/set within the context of this test
              if (keys.contains(prop.getName()))
                  continue;
              Object value = prop.get(config);
              if (value == null)
                  continue;
              prop.set(config, value);
              Object back = prop.get(config);
              assertThat(back).isEqualTo(value);
          }
      }
  
      @Test
      public void configMutate() throws Exception
      {
          Map<String, Property> ps = loader.getProperties(Config.class);
          assertThat(ps)
                    .isNotEmpty()
                    .containsKey("cluster_name") // string / primitive
                    .containsKey("permissions_validity") // SmallestDurationSeconds
                    .containsKey("hinted_handoff_disabled_datacenters") // set<string>
                    .containsKey("disk_access_mode"); // enum
  
          // can we mutate the config?
          Config config = new Config();
  
          ps.get("cluster_name").set(config, "properties testing");
          assertThat(config.cluster_name).isEqualTo("properties testing");
  
          ps.get("permissions_validity").set(config, new DurationSpec.IntMillisecondsBound(42));
          assertThat(config.permissions_validity.toMilliseconds()).isEqualTo(42);
  
          ps.get("hinted_handoff_disabled_datacenters").set(config, Sets.newHashSet("a", "b", "c"));
          assertThat(config.hinted_handoff_disabled_datacenters).isEqualTo(Sets.newHashSet("a", "b", "c"));
  
          ps.get("disk_access_mode").set(config, Config.DiskAccessMode.mmap);
          assertThat(config.disk_access_mode).isEqualTo(Config.DiskAccessMode.mmap);
      }
  
      @Test
      public void nestedMutate() throws Exception
      {
          Map<String, Property> ps = loader.flatten(Config.class);
  
          assertThat(ps)
          .containsKey("seed_provider.class_name");
  
          // can we mutate the config?
          Config config = new Config();
  
          ps.get("seed_provider.class_name").set(config, "testing");
          assertThat(config.seed_provider.class_name).isEqualTo("testing");
      }
  }