content: /*
   * Copyright 2021-2024 Aklivity Inc.
   *
   * Aklivity 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 io.aklivity.zilla.runtime.binding.mqtt.config;
  
  import static java.util.Collections.emptyList;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.Objects;
  import java.util.Optional;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import io.aklivity.zilla.runtime.binding.mqtt.internal.config.MqttVersion;
  import io.aklivity.zilla.runtime.engine.config.ModelConfig;
  import io.aklivity.zilla.runtime.engine.config.OptionsConfig;
  
  public class MqttOptionsConfig extends OptionsConfig
  {
      public final MqttAuthorizationConfig authorization;
      public final List<MqttTopicConfig> topics;
      public final List<MqttVersion> versions;
  
      public static MqttOptionsConfigBuilder<MqttOptionsConfig> builder()
      {
          return new MqttOptionsConfigBuilder<>(MqttOptionsConfig.class::cast);
      }
  
      public static <T> MqttOptionsConfigBuilder<T> builder(
          Function<OptionsConfig, T> mapper)
      {
          return new MqttOptionsConfigBuilder<>(mapper);
      }
  
      public MqttOptionsConfig(
          MqttAuthorizationConfig authorization,
          List<MqttTopicConfig> topics,
          List<MqttVersion> versions)
      {
          super(resolveModels(topics), List.of());
          this.authorization = authorization;
          this.topics = topics;
          this.versions = versions;
      }
  
      private static List<ModelConfig> resolveModels(
          List<MqttTopicConfig> topics)
      {
          return topics != null && !topics.isEmpty()
              ? topics.stream()
              .flatMap(topic -> Stream.concat(
                      Stream.of(topic.content),
                      Optional.ofNullable(topic.userProperties).orElseGet(Collections::emptyList).stream()
                          .flatMap(p -> Stream.of(p.value))
                          .filter(Objects::nonNull))
                  .filter(Objects::nonNull))
              .collect(Collectors.toList())
              : emptyList();
      }
  }
  