/*

  * 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.shiro.authz.annotation;

 import java.lang.annotation.ElementType;

 import java.lang.annotation.Retention;

 import java.lang.annotation.RetentionPolicy;

 import java.lang.annotation.Target;

 /**

  * Requires the current Subject to be a &quot;guest&quot;, that is, they are not authenticated <em>or</em> remembered

  * from a previous session for the annotated class/instance/method to be accessed or invoked.

  * <p/>

  * This annotation is the logical inverse of the {@link RequiresUser RequiresUser} annotation. That is,

  * <code>RequiresUser == !RequiresGuest</code>, or more accurately,

  * <p/>

  * <code>RequiresGuest === subject.{@link org.apache.shiro.subject.Subject#getPrincipal() getPrincipal()} == null</code>.

  *

  * @see RequiresAuthentication

  * @see RequiresUser

  *

  * @since 0.9.0

  */

 @Target({ElementType.TYPE, ElementType.METHOD})

 @Retention(RetentionPolicy.RUNTIME)

 public @interface RequiresGuest {

 }