001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    package org.apache.shiro.web.tags;
020    
021    import javax.servlet.jsp.JspException;
022    import javax.servlet.jsp.tagext.TagSupport;
023    
024    /**
025     * @since 0.1
026     */
027    public abstract class PermissionTag extends SecureTag {
028    
029        //TODO - complete JavaDoc
030    
031        private String name = null;
032    
033        public PermissionTag() {
034        }
035    
036        public String getName() {
037            return name;
038        }
039    
040        public void setName(String name) {
041            this.name = name;
042        }
043    
044        protected void verifyAttributes() throws JspException {
045            String permission = getName();
046    
047            if (permission == null || permission.length() == 0) {
048                String msg = "The 'name' tag attribute must be set.";
049                throw new JspException(msg);
050            }
051        }
052    
053        public int onDoStartTag() throws JspException {
054    
055            String p = getName();
056    
057            boolean show = showTagBody(p);
058            if (show) {
059                return TagSupport.EVAL_BODY_INCLUDE;
060            } else {
061                return TagSupport.SKIP_BODY;
062            }
063        }
064    
065        protected boolean isPermitted(String p) {
066            return getSubject() != null && getSubject().isPermitted(p);
067        }
068    
069        protected abstract boolean showTagBody(String p);
070    
071    }