DataKeys: deprecate

java/openapi/src/com/intellij/openapi/actionSystem/DataKeys.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 JetBrains s.r.o.
+ * Copyright 2000-2018 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,10 @@
 package com.intellij.openapi.actionSystem;
 
 
+/**
+ * @deprecated Please use {@link LangDataKeys}, {@link PlatformDataKeys} or {@link CommonDataKeys} directly.
+ */
+@Deprecated
 public final class DataKeys extends LangDataKeys {
   private DataKeys() {
   }