1 /* 2 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.internal; 27 28 import java.lang.annotation.*; 29 30 /** 31 * Indicates the API declaration in question is associated with a 32 * <em>preview feature</em>. See JEP 12: "Preview Language and VM 33 * Features" (http://openjdk.java.net/jeps/12). 34 * @since 14 35 */ 36 // Match the meaningful targets of java.lang.Deprecated, omit local 37 // variables and parameter declarations 38 @Target({ElementType.METHOD, 39 ElementType.CONSTRUCTOR, 40 ElementType.FIELD, 41 ElementType.PACKAGE, 42 ElementType.MODULE, 43 ElementType.TYPE}) 44 // CLASS retention will hopefully be sufficient for the purposes at hand 45 @Retention(RetentionPolicy.CLASS) 46 // *Not* @Documented 47 public @interface PreviewFeature { 48 /** 49 * Name of the preview feature the annotated API is associated 50 * with. 51 */ 52 public Feature feature(); 53 54 public boolean essentialAPI() default false; 55 56 public enum Feature { 57 TEXT_BLOCKS; 58 } 59 }