package com.atlassian.johnson.spring.lifecycle;
   
   import com.google.common.base.Objects;
   
   import javax.annotation.Nonnull;
   import javax.servlet.ServletContext;
   
   /**
    * @since 3.0
   */
  public class LifecycleUtils {
  
      private static final String ATTR_STATE = LifecycleState.class.getName() + ":Current";
  
      private LifecycleUtils() {
          throw new UnsupportedOperationException(getClass() + " is a utility class and should not be instantiated.");
      }
  
      @Nonnull
      public static LifecycleState getCurrentState(@Nonnull ServletContext servletContext) {
          LifecycleState state = (LifecycleState) servletContext.getAttribute(ATTR_STATE);
  
          return Objects.firstNonNull(state, LifecycleState.CREATED);
      }
  
      public static boolean isStarting(@Nonnull ServletContext servletContext) {
          LifecycleState state = getCurrentState(servletContext);
  
          return state == LifecycleState.CREATED || state == LifecycleState.STARTING;
      }
  
      public static void updateState(@Nonnull ServletContext servletContext, @Nonnull LifecycleState state) {
          servletContext.setAttribute(ATTR_STATE, state);
      }
  }