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.render; 020 021 import java.io.IOException; 022 import java.util.Iterator; 023 import java.util.List; 024 025 import org.apache.log4j.Logger; 026 import org.jdom2.JDOMException; 027 import org.jdom2.Text; 028 import org.jdom2.xpath.XPath; 029 030 import org.apache.wiki.WikiContext; 031 import org.apache.wiki.parser.WikiDocument; 032 033 /** 034 * A simple renderer that just renders all the text() nodes 035 * from the DOM tree. This is very useful for cleaning away 036 * all of the XHTML. 037 * 038 * @since 2.4 039 */ 040 public class CleanTextRenderer 041 extends WikiRenderer 042 { 043 private static final String ALL_TEXT_NODES = "//text()"; 044 045 protected static final Logger log = Logger.getLogger( CleanTextRenderer.class ); 046 047 /** 048 * Create a renderer. 049 * 050 * @param context {@inheritDoc} 051 * @param doc {@inheritDoc} 052 */ 053 public CleanTextRenderer( WikiContext context, WikiDocument doc ) 054 { 055 super( context, doc ); 056 } 057 058 /** 059 * {@inheritDoc} 060 */ 061 public String getString() 062 throws IOException 063 { 064 StringBuffer sb = new StringBuffer(); 065 066 try 067 { 068 XPath xp = XPath.newInstance( ALL_TEXT_NODES ); 069 070 List nodes = xp.selectNodes(m_document.getDocument()); 071 072 for( Iterator i = nodes.iterator(); i.hasNext(); ) 073 { 074 Object el = i.next(); 075 076 if( el instanceof Text ) 077 { 078 sb.append( ((Text)el).getValue() ); 079 } 080 } 081 } 082 catch( JDOMException e ) 083 { 084 log.error("Could not parse XPATH expression"); 085 throw new IOException( e.getMessage() ); 086 } 087 088 return sb.toString(); 089 } 090 }