src/java.compiler/share/classes/javax/annotation/processing/ProcessingEnvironment.java

*** 1,7 ****
  /*
!  * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 129,134 ****
--- 129,148 ----
       *
       * @return the current locale or {@code null} if no locale is in
       * effect
       */
      Locale getLocale();
+ 
+     /**
+      * Returns {@code true} if <em>preview features</em> are enabled
+      * and {@code false} otherwise.
+      * @return whether or not preview features are enabled
+      *
+      * @implSpec The default implementation of this method returns
+      * {@code false}.
+      *
+      * @since 13
+      */
+     default boolean isPreviewEnabled() {
+         return false;
+     }
  }