src/jdk.compiler/share/classes/com/sun/tools/javac/processing/JavacProcessingEnvironment.java

*** 1,7 ****
  /*
!  * Copyright (c) 2005, 2018, 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
*** 186,195 ****
--- 186,200 ----
      private final Completer initialCompleter;
      private final Check chk;
  
      private final Context context;
  
+     /**
+      * Support for preview language features.
+      */
+     private final Preview preview;
+ 
      /** Get the JavacProcessingEnvironment instance for this context. */
      public static JavacProcessingEnvironment instance(Context context) {
          JavacProcessingEnvironment instance = context.get(JavacProcessingEnvironment.class);
          if (instance == null)
              instance = new JavacProcessingEnvironment(context);
*** 234,243 ****
--- 239,249 ----
          dcfh = DeferredCompletionFailureHandler.instance(context);
          names = Names.instance(context);
          enter = Enter.instance(context);
          initialCompleter = ClassFinder.instance(context).getCompleter();
          chk = Check.instance(context);
+         preview = Preview.instance(context);
          initProcessorLoader();
      }
  
      public void setProcessors(Iterable<? extends Processor> processors) {
          Assert.checkNull(discoveredProcs);
*** 1673,1682 ****
--- 1679,1693 ----
      @DefinedBy(Api.ANNOTATION_PROCESSING)
      public Locale getLocale() {
          return messages.getCurrentLocale();
      }
  
+     @DefinedBy(Api.ANNOTATION_PROCESSING)
+     public boolean isPreviewEnabled() {
+         return preview.isEnabled();
+     }
+ 
      public Set<Symbol.PackageSymbol> getSpecifiedPackages() {
          return specifiedPackages;
      }
  
      public static final Pattern noMatches  = Pattern.compile("(\\P{all})+");