package cn.home1.oss.boot.autoconfigure;
   
   import static java.util.stream.Collectors.toList;
   
   import org.springframework.context.ApplicationContext;
   import org.springframework.util.ClassUtils;
   
   import java.util.Arrays;
   import java.util.Map;
  
  /**
   * Created by zhanghaolun on 16/10/29.
   */
  public abstract class AppUtils {
  
    private AppUtils() {
    }
  
    public static void printApplicationInfo(final ApplicationContext ctx) {
      System.out.println("Current environment is: " + ctx.getBean(AppProperties.class).getEnv());
      System.out.println("Let's inspect the beans provided by Spring Boot:");
  
      final String[] beanNames = ctx.getBeanDefinitionNames();
      for (final String beanName : Arrays.stream(beanNames).sorted().collect(toList())) {
        final Object bean = ctx.getBean(beanName);
        final Class<?> clazz = bean != null ? bean.getClass() : null;
        final String clazzName = clazz != null ? clazz.getName() : "null";
        System.out.println(beanName + " - " + clazzName);
      }
    }
  
    public static String appBasePackage(final String defaultValue) {
      final Map.Entry<String, String> javaMainClass = System.getenv().entrySet() //
        .stream() //
        .filter(entry -> entry.getKey().startsWith("JAVA_MAIN_CLASS")) //
        .findFirst() //
        .orElse(null);
  
      final String sunJavaCommand = System.getProperty("sun.java.command");
  
      final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
  
      final String result;
      if (javaMainClass != null && ClassUtils.isPresent(javaMainClass.getValue(), classLoader)) {
        result = ClassUtils.getPackageName(javaMainClass.getValue());
      } else if (ClassUtils.isPresent(sunJavaCommand, classLoader)) {
        result = ClassUtils.getPackageName(sunJavaCommand);
      } else {
        result = defaultValue;
      }
      return result;
    }
  }