/*

  * 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.web.tags;

 import javax.servlet.jsp.JspException;

 import javax.servlet.jsp.tagext.TagSupport;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 /**

  * JSP tag that renders the tag body only if the current user has <em>not</em> executed a successful authentication

  * attempt <em>during their current session</em>.

  *

  * <p>The logically opposite tag of this one is the {@link org.apache.shiro.web.tags.AuthenticatedTag}.

  *

  * @since 0.2

  */

 public class NotAuthenticatedTag extends SecureTag {

     //TODO - complete JavaDoc

     private static final Logger log = LoggerFactory.getLogger(NotAuthenticatedTag.class);

     public int onDoStartTag() throws JspException {

         if (getSubject() == null || !getSubject().isAuthenticated()) {

             if (log.isTraceEnabled()) {

                 log.trace("Subject does not exist or is not authenticated.  Tag body will be evaluated.");

             }

             return TagSupport.EVAL_BODY_INCLUDE;

         } else {

             if (log.isTraceEnabled()) {

                 log.trace("Subject exists and is authenticated.  Tag body will not be evaluated.");

             }

             return TagSupport.SKIP_BODY;

         }

     }

 }