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

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
+ * 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

@@ -186,10 +186,15 @@
     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);

@@ -234,10 +239,11 @@
         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);

@@ -1673,10 +1679,15 @@
     @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})+");