content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.spark.annotation;
  
  import java.lang.annotation.Documented;
  
  /**
   * Annotation to inform users of how much to rely on a particular package,
   * class or method not changing over time.
   */
  public class InterfaceStability {
  
    /**
     * Stable APIs that retain source and binary compatibility within a major release.
     * These interfaces can change from one major release to another major release
     * (e.g. from 1.0 to 2.0).
     */
    @Documented
    public @interface Stable {};
  
    /**
     * APIs that are meant to evolve towards becoming stable APIs, but are not stable APIs yet.
     * Evolving interfaces can change from one feature release to another release (i.e. 2.1 to 2.2).
     */
    @Documented
    public @interface Evolving {};
  
    /**
     * Unstable APIs, with no guarantee on stability.
     * Classes that are unannotated are considered Unstable.
     */
    @Documented
    public @interface Unstable {};
  }
  