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.wiki.tags;
020    
021    import javax.servlet.jsp.JspException;
022    import javax.servlet.jsp.PageContext;
023    import javax.servlet.jsp.tagext.BodyContent;
024    import javax.servlet.jsp.tagext.BodyTagSupport;
025    
026    import org.apache.wiki.WikiContext;
027    
028    import org.apache.log4j.Logger;
029    
030    /**
031     *  Converts the body text into HTML content.
032     *
033     *  @since 2.0
034     */
035    public class TranslateTag
036        extends BodyTagSupport
037    {
038        private static final long serialVersionUID = 0L;
039        
040        static    Logger    log = Logger.getLogger( TranslateTag.class );
041    
042        public final int doAfterBody()
043            throws JspException
044        {
045            try
046            {
047                WikiContext context = (WikiContext) pageContext.getAttribute( WikiTagBase.ATTR_CONTEXT,
048                                                                              PageContext.REQUEST_SCOPE );
049    
050                //
051                //  Because the TranslateTag should not affect any of the real page attributes
052                //  we have to make a clone here.
053                //
054                
055                context = context.deepClone();
056                
057                //
058                //  Get the page data.
059                //
060                BodyContent bc = getBodyContent();
061                String wikiText = bc.getString();
062                bc.clearBody();
063    
064                if( wikiText != null )
065                {
066                    wikiText = wikiText.trim();
067                
068                    String result = context.getEngine().textToHTML( context, wikiText );
069    
070                    getPreviousOut().write( result );
071                }
072            }
073            catch( Exception e )
074            {
075                log.error( "Tag failed", e );
076                throw new JspException( "Tag failed, check logs: "+e.getMessage() );
077            }
078    
079            return SKIP_BODY;
080        }
081    }