1   /*
2    * Copyright (C) 2010 The Guava Authors
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    * http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package com.google.common.annotations;
18  
19  import java.lang.annotation.Documented;
20  import java.lang.annotation.ElementType;
21  import java.lang.annotation.Retention;
22  import java.lang.annotation.RetentionPolicy;
23  import java.lang.annotation.Target;
24  
25  /**
26   * Signifies that a public API (public class, method or field) is subject to
27   * incompatible changes, or even removal, in a future release. An API bearing
28   * this annotation is exempt from any compatibility guarantees made by its
29   * containing library. Note that the presence of this annotation implies nothing
30   * about the quality or performance of the API in question, only the fact that
31   * it is not "API-frozen."
32   *
33   * <p>It is generally safe for <i>applications</i> to depend on beta APIs, at
34   * the cost of some extra work during upgrades. However it is generally
35   * inadvisable for <i>libraries</i> (which get included on users' CLASSPATHs,
36   * outside the library developers' control) to do so.
37   *
38   *
39   * @author Kevin Bourrillion
40   */
41  @Retention(RetentionPolicy.CLASS)
42  @Target({
43      ElementType.ANNOTATION_TYPE,
44      ElementType.CONSTRUCTOR,
45      ElementType.FIELD,
46      ElementType.METHOD,
47      ElementType.TYPE})
48  @Documented
49  @GwtCompatible
50  public @interface Beta {}