/*

  * 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;

 /**

  * @since 0.1

  */

 public abstract class PermissionTag extends SecureTag {

     //TODO - complete JavaDoc

     private String name = null;

     public PermissionTag() {

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     protected void verifyAttributes() throws JspException {

         String permission = getName();

         if (permission == null || permission.length() == 0) {

             String msg = "The 'name' tag attribute must be set.";

             throw new JspException(msg);

         }

     }

     public int onDoStartTag() throws JspException {

         String p = getName();

         boolean show = showTagBody(p);

         if (show) {

             return TagSupport.EVAL_BODY_INCLUDE;

         } else {

             return TagSupport.SKIP_BODY;

         }

     }

     protected boolean isPermitted(String p) {

         return getSubject() != null && getSubject().isPermitted(p);

     }

     protected abstract boolean showTagBody(String p);

 }