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 */ 019package org.apache.wiki.tags; 020 021import org.apache.logging.log4j.LogManager; 022import org.apache.logging.log4j.Logger; 023import org.apache.wiki.WikiContext; 024import org.apache.wiki.api.core.Context; 025 026import javax.servlet.jsp.JspException; 027import javax.servlet.jsp.PageContext; 028import javax.servlet.jsp.tagext.BodyTagSupport; 029import javax.servlet.jsp.tagext.TryCatchFinally; 030import java.io.IOException; 031 032 033/** 034 * This is a class that provides the same services as the WikiTagBase, but this time it 035 * works for the BodyTagSupport base class. 036 */ 037public abstract class WikiBodyTag extends BodyTagSupport implements TryCatchFinally { 038 039 private static final long serialVersionUID = -6732266865112847897L; 040 protected WikiContext m_wikiContext; 041 private static final Logger log = LogManager.getLogger( WikiBodyTag.class ); 042 043 public int doStartTag() throws JspException { 044 try { 045 m_wikiContext = (WikiContext) pageContext.getAttribute( Context.ATTR_CONTEXT, PageContext.REQUEST_SCOPE ); 046 if( m_wikiContext == null ) { 047 throw new JspException("WikiContext may not be NULL - serious internal problem!"); 048 } 049 050 return doWikiStartTag(); 051 } catch( final Exception e ) { 052 log.error( "Tag failed", e ); 053 throw new JspException( "Tag failed, check logs: "+e.getMessage() ); 054 } 055 } 056 057 /** 058 * A local stub for doing tags. This is just called after the local variables 059 * have been set. 060 * @return As doStartTag() 061 * @throws JspException 062 * @throws IOException 063 */ 064 public abstract int doWikiStartTag() throws JspException, IOException; 065 066 public void doCatch( final Throwable arg0) throws Throwable { 067 } 068 069 public void doFinally() 070 { 071 m_wikiContext = null; 072 } 073 074}