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