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.carbondata.common.annotations;
  
  import java.lang.annotation.Documented;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  
  /**
   * This annotation is ported and modified from Apache Hadoop project.
   *
   * Annotation to inform users of how much to rely on a particular package,
   * class or method not changing over time. Currently the stability can be
   * {@link Stable}, {@link Evolving} or {@link Unstable}. <br>
   *
   * 1. {@link Stable} means compatibility can break only at major release (m.0)
   * 2. {@link Evolving} means compatibility can break at minor release (m.x)
   * 3. {@link Unstable} means compatibility can break at any release
   *
   * <ul><li>All classes that are annotated with {@link InterfaceAudience.User} or
   * {@link InterfaceAudience.Developer} must have InterfaceStability annotation. </li>
   * <li>Classes that are {@link InterfaceAudience.Internal} are to be considered unstable unless
   * a different InterfaceStability annotation states otherwise.</li>
   * <li>Incompatible changes must not be made to classes marked as stable.</li>
   * </ul>
   */
  @InterfaceAudience.User
  @org.apache.hadoop.classification.InterfaceStability.Evolving
  public class InterfaceStability {
    /**
     * Can evolve while retaining compatibility for minor release boundaries.;
     * can break compatibility only at major release (ie. at m.0).
     */
    @Documented
    @Retention(RetentionPolicy.RUNTIME)
    public @interface Stable { }
  
    /**
     * Evolving, but can break compatibility at minor release (i.e. m.x)
     */
    @Documented
    @Retention(RetentionPolicy.RUNTIME)
    public @interface Evolving { }
  
    /**
     * No guarantee is provided as to reliability or stability across any
     * level of release granularity.
     */
    @Documented
    @Retention(RetentionPolicy.RUNTIME)
    public @interface Unstable { }
  }
  