content: /*
   * Copyright (c) 2020 Adam Gaj
   *
   * 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 com.adgadev.jplusone.core.utils;
  
  import lombok.RequiredArgsConstructor;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.context.ApplicationContext;
  
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Optional;
  
  @RequiredArgsConstructor
  public class ApplicationScanner {
  
      private final ApplicationContext context;
  
      public String resolveRootApplicationPackage() {
          return findSpringBootApplicationClass()
              .map(clazz -> clazz.getPackage().getName())
              .orElse(null);
      }
  
      private Optional<Class<?>> findSpringBootApplicationClass() {
          Map<String, Object> beans = context.getBeansWithAnnotation(SpringBootApplication.class);
          Iterator<Object> iterator = beans.values().iterator();
  
          return Optional.of(iterator)
                  .filter(Iterator::hasNext)
                  .map(Iterator::next)
                  .map(Object::getClass);
      }
  }
  