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/*
 * Copyright 2021 Google LLC
 *
 * Licensed 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
 *
 *     https://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 com.google.apphosting.api;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Annotation that marks a package or class as internal to App Engine. When
 * applied to package, all subpackages are also considered to be internal. User
 * code cannot safely depend on any class with this annotation or any class
 * belonging to a package or a parent package with this annotation.
 *
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(value = {ElementType.PACKAGE, ElementType.TYPE})
public @interface AppEngineInternal {

  /**
   * @return A custom message to be printed when an unsafe reference to an
   * internal class is detected.
   */
  String message() default "";
}