    001    /*
    002     * Copyright (C) 2010 The Guava Authors
    003     *
    004     * Licensed under the Apache License, Version 2.0 (the "License");
    005     * you may not use this file except in compliance with the License.
    006     * You may obtain a copy of the License at
    007     *
    008     * http://www.apache.org/licenses/LICENSE-2.0
    009     *
    010     * Unless required by applicable law or agreed to in writing, software
    011     * distributed under the License is distributed on an "AS IS" BASIS,
    012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    013     * See the License for the specific language governing permissions and
    014     * limitations under the License.
    015     */
    016
    017    package com.google.common.annotations;
    018
    019    import java.lang.annotation.Documented;
    020    import java.lang.annotation.ElementType;
    021    import java.lang.annotation.Retention;
    022    import java.lang.annotation.RetentionPolicy;
    023    import java.lang.annotation.Target;
    024
    025    /**
    026     * Signifies that a public API (public class, method or field) is subject to
    027     * incompatible changes, or even removal, in a future release. An API bearing
    028     * this annotation is exempt from any compatibility guarantees made by its
    029     * containing library. Note that the presence of this annotation implies nothing
    030     * about the quality or performance of the API in question, only the fact that
    031     * it is not "API-frozen."
    032     *
    033     * <p>It is generally safe for <i>applications</i> to depend on beta APIs, at
    034     * the cost of some extra work during upgrades. However it is generally
    035     * inadvisable for <i>libraries</i> (which get included on users' CLASSPATHs,
    036     * outside the library developers' control) to do so.
    037     *
    038     *
    039     * @author Kevin Bourrillion
    040     */
    041    @Retention(RetentionPolicy.CLASS)
    042    @Target({
    043        ElementType.ANNOTATION_TYPE,
    044        ElementType.CONSTRUCTOR,
    045        ElementType.FIELD,
    046        ElementType.METHOD,
    047        ElementType.TYPE})
    048    @Documented
    049    @GwtCompatible
    050    public @interface Beta {}