Coverage report

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org.apache.jetspeed.rewriter.html.neko.NekoParserAdaptor
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 1   
 /*
 2   
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3   
  * contributor license agreements.  See the NOTICE file distributed with
 4   
  * this work for additional information regarding copyright ownership.
 5   
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6   
  * (the "License"); you may not use this file except in compliance with
 7   
  * the License.  You may obtain a copy of the License at
 8   
  *
 9   
  *      http://www.apache.org/licenses/LICENSE-2.0
 10   
  *
 11   
  * Unless required by applicable law or agreed to in writing, software
 12   
  * distributed under the License is distributed on an "AS IS" BASIS,
 13   
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 14   
  * See the License for the specific language governing permissions and
 15   
  * limitations under the License.
 16   
  */
 17   
 package org.apache.jetspeed.rewriter.html.neko;
 18   
 
 19   
 import java.io.Reader;
 20   
 import java.io.IOException;
 21   
 
 22   
 import org.apache.commons.logging.Log;
 23   
 import org.apache.commons.logging.LogFactory;
 24   
 import org.apache.xerces.xni.parser.XMLDocumentFilter;
 25   
 import org.apache.xerces.xni.parser.XMLInputSource;
 26   
 
 27   
 import org.apache.jetspeed.rewriter.ParserAdaptor;
 28   
 import org.apache.jetspeed.rewriter.Rewriter;
 29   
 import org.apache.jetspeed.rewriter.RewriterException;
 30   
 
 31   
 import org.xml.sax.SAXException ;
 32   
 
 33   
 import org.cyberneko.html.parsers.SAXParser;
 34   
 import org.cyberneko.html.filters.DefaultFilter;
 35   
 import org.cyberneko.html.filters.Purifier;
 36   
 
 37   
 
 38   
 /**
 39   
  * <p>
 40   
  * NekoParserAdapter
 41   
  * </p>
 42   
  * <p>
 43   
  *
 44   
  * </p>
 45   
  * @author <a href="mailto:dyoung@phase2systems.com">David L Young</a>
 46   
  * @version $Id: $
 47   
  *
 48   
  */
 49   
 public class NekoParserAdaptor implements ParserAdaptor
 50   
 {
 51  0 
     protected final static Log log = LogFactory.getLog(NekoParserAdaptor.class);
 52   
 
 53   
     /*
 54   
      * Construct a cyberneko HTML parser adaptor
 55   
      */
 56   
     public NekoParserAdaptor()
 57   
     {
 58  0 
         super();
 59  0 
     }
 60   
 
 61   
     /**
 62   
      * <p>
 63   
      * parse
 64   
      * </p>
 65   
      *
 66   
      * @see org.apache.jetspeed.rewriter.ParserAdaptor#parse(org.apache.jetspeed.rewriter.Rewriter, java.io.Reader)
 67   
      * @param rewriter
 68   
      * @param reader
 69   
      * @throws RewriterException
 70   
      */
 71   
     public void parse(Rewriter rewriter, Reader reader)
 72   
             throws RewriterException
 73   
     {
 74   
         // not sure what this means to parse without rewriting
 75  0 
         rewrite(rewriter,reader,null);
 76  0 
     }
 77   
 
 78   
     /**
 79   
      * <p>
 80   
      * rewrite
 81   
      * </p>
 82   
      *
 83   
      * @see org.apache.jetspeed.rewriter.ParserAdaptor#rewrite(org.apache.jetspeed.rewriter.Rewriter, java.io.Reader, java.io.Writer)
 84   
      * @param rewriter
 85   
      * @param reader
 86   
      * @param writer
 87   
      * @throws RewriterException
 88   
      */
 89   
     public void rewrite(Rewriter rewriter, java.io.Reader reader, java.io.Writer writer)
 90   
             throws RewriterException
 91   
     {
 92   
         // use a cyberneko SAXParser
 93  0 
         SAXParser parser = new SAXParser() ;
 94   
 
 95   
         // setup filter chain
 96  0 
         XMLDocumentFilter[] filters = {
 97   
             new Purifier(),                                                                                  // [1] standard neko purifications (tag balancing, etc)
 98   
             new CallbackElementRemover( rewriter ),                                                          // [2] accept / reject tags based on advice from rewriter
 99   
             writer != null ? new org.cyberneko.html.filters.Writer( writer, class="keyword">null ) : class="keyword">new DefaultFilter()     // [3] propagate results to specified writer (or do nothing -- Default -- when writer is null)
 100   
         };
 101   
 
 102  0 
         String filtersPropName = "http://cyberneko.org/html/properties/filters";
 103   
 
 104   
         try
 105   
         {
 106  0 
             parser.setProperty(filtersPropName, filters);
 107   
         }
 108  0 
         catch (SAXException e)
 109   
         {
 110   
             // either no longer supported (SAXNotSupportedException), or no logner recognized (SAXNotRecognizedException)
 111  0 
             log.error(filtersPropName + " is, unexpectedly, no longer defined for the cyberneko HTML parser",e);
 112  0 
             throw new RewriterException("cyberneko parser version not supported",e);
 113  0 
         }
 114   
 
 115   
         try
 116   
         {
 117   
             // parse from reader
 118  0 
             parser.parse(new XMLInputSource( null, class="keyword">null, class="keyword">null, reader, class="keyword">null )) ;
 119   
         }
 120  0 
         catch (IOException e)
 121   
         {
 122  0 
             String msg = "cyberneko HTML parsing failure";
 123  0 
             log.error(msg,e);
 124  0 
             throw new RewriterException(msg,e);
 125  0 
         }
 126   
 
 127  0 
     }
 128   
 
 129   
 }

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