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 a package, class or method's intended audience.
   * Currently the audience can be {@link User}, {@link Developer}, {@link Internal}
   *
   * Public classes that are not marked with this annotation must be
   * considered by default as {@link Internal}.</li>
   *
   * External applications must only use classes that are marked {@link User}.
   *
   * Methods may have a different annotation that it is more restrictive
   * compared to the audience classification of the class. Example: A class
   * might be {@link User}, but a method may be {@link Developer}
   */
  @InterfaceAudience.User
  @InterfaceStability.Evolving
  public class InterfaceAudience {
    /**
     * Intended for use by any project or application.
     */
    @Documented
    @Retention(RetentionPolicy.RUNTIME)
    public @interface User { }
  
    /**
     * Intended for developers to develop extension for Apache CarbonData project
     */
    @Documented
    @Retention(RetentionPolicy.RUNTIME)
    public @interface Developer {
      String[] value();
    }
  
    /**
     * Intended only for internal usage within Apache CarbonData project.
     */
    @Documented
    @Retention(RetentionPolicy.RUNTIME)
    public @interface Internal { }
  
    private InterfaceAudience() { } // Audience can't exist on its own
  }
  