content: /*
   * 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
   *
   *     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.airlift.configuration;
  
  import com.google.inject.Binder;
  import com.google.inject.Module;
  
  import java.util.function.Function;
  
  import static java.util.Objects.requireNonNull;
  
  public class SwitchModule<T>
          extends AbstractConfigurationAwareModule
  {
      public static <C, V> Module switchModule(
              Class<C> config,
              Function<C, V> valueProvider,
              Function<V, Module> moduleProvider)
      {
          requireNonNull(valueProvider, "valueProvider is null");
          moduleProvider = requireNonNull(moduleProvider, "moduleProvider is null");
          return new SwitchModule<>(config, valueProvider.andThen(moduleProvider));
      }
  
      private final Class<T> config;
      private final Function<T, Module> moduleProvider;
  
      private SwitchModule(Class<T> config, Function<T, Module> moduleProvider)
      {
          this.config = requireNonNull(config, "config is null");
          this.moduleProvider = requireNonNull(moduleProvider, "moduleProvider is null");
      }
  
      @Override
      protected void setup(Binder binder)
      {
          T configuration = buildConfigObject(config);
          install(moduleProvider.apply(configuration));
      }
  }
  