Examples of org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenStream
A TokenStream enumerates the sequence of tokens, either from {@link Field}s of a {@link Document} or from query text.
This is an abstract class; concrete subclasses are:
- {@link Tokenizer}, a TokenStream whose input is a Reader; and
- {@link TokenFilter}, a TokenStream whose input is another TokenStream.
A new TokenStream API has been introduced with Lucene 2.9. This API has moved from being {@link Token}-based to {@link Attribute}-based. While {@link Token} still exists in 2.9 as a convenience class, the preferred wayto store the information of a {@link Token} is to use {@link AttributeImpl}s.
TokenStream now extends {@link AttributeSource}, which provides access to all of the token {@link Attribute}s for the TokenStream. Note that only one instance per {@link AttributeImpl} is created and reusedfor every token. This approach reduces object creation and allows local caching of references to the {@link AttributeImpl}s. See {@link #incrementToken()} for further details.
The workflow of the new TokenStream API is as follows:
1. Instantiation of TokenStream/ {@link TokenFilter}s which add/get attributes to/from the {@link AttributeSource}.
2. The consumer calls {@link TokenStream#reset()}.
3. The consumer retrieves attributes from the stream and stores local references to all attributes it wants to access.
4. The consumer calls {@link #incrementToken()} until it returns falseconsuming the attributes after each call.
5. The consumer calls {@link #end()} so that any end-of-stream operationscan be performed.
6. The consumer calls {@link #close()} to release any resource when finishedusing the TokenStream.
To make sure that filters and consumers know which attributes are available, the attributes must be added during instantiation. Filters and consumers are not required to check for availability of attributes in {@link #incrementToken()}.
You can find some example code for the new API in the analysis package level Javadoc.
Sometimes it is desirable to capture a current state of a TokenStream, e.g., for buffering purposes (see {@link CachingTokenFilter}, {@link TeeSinkTokenFilter}). For this usecase {@link AttributeSource#captureState} and {@link AttributeSource#restoreState}can be used.

  }
  
  protected Set<String> getHighlightWords(String searchString) {
    try {
      Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
      TokenStream stream = analyzer.tokenStream("content", new StringReader(searchString));
      TermAttribute termAtt = (TermAttribute) stream.addAttribute(TermAttribute.class);
      for (boolean next = stream.incrementToken(); next; next = stream.incrementToken()) {
        String term = termAtt.term();
        if(log.isDebug()) log.debug(term);
      }
    } catch (IOException e) {
      log.error("", e);

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    Set terms = new HashSet();
    query.extractTerms(terms);
    
    try {
      //highlight content
      TokenStream tokenStream = analyzer.tokenStream(OlatDocument.CONTENT_FIELD_NAME, new StringReader(content));                
      String highlightResult = highlighter.getBestFragments(tokenStream, content, 3, HIGHLIGHT_SEPARATOR);
      // if no highlightResult is in content => look in description
      if (highlightResult.length() == 0) {
        String description = doc.get(OlatDocument.DESCRIPTION_FIELD_NAME);     
        tokenStream = analyzer.tokenStream(OlatDocument.DESCRIPTION_FIELD_NAME, new StringReader(description));

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      {
        String text = hits.doc(i).get(FIELD_NAME);
        int maxNumFragmentsRequired = 5;
        String fragmentSeparator = "...";
        TermPositionVector tpv = (TermPositionVector)reader.getTermFreqVector(hits.id(i),FIELD_NAME); 
        TokenStream tokenStream=TokenSources.getTokenStream(tpv);
        /*
        TokenStream tokenStream2=
          (new StandardAnalyzer())
          //XFactory.getWriterAnalyzer()
            .tokenStream(FIELD_NAME,new StringReader(text));

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      String text = hit.get(FIELD_NAME);
      int maxNumFragmentsRequired = 5;
      String fragmentSeparator = "...";
      TermPositionVector tpv = (TermPositionVector) reader
          .getTermFreqVector(docId, FIELD_NAME);
      TokenStream tokenStream = TokenSources.getTokenStream(tpv);
      String result = highlighter.getBestFragments(tokenStream, text,
          maxNumFragmentsRequired, fragmentSeparator);
      System.out.println("\n" + result);
    }
    reader.close();

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      String text = hit.get(FIELD_NAME);
      int maxNumFragmentsRequired = 5;
      String fragmentSeparator = "...";
      TermPositionVector tpv = (TermPositionVector) reader
          .getTermFreqVector(docId, FIELD_NAME);
      TokenStream tokenStream = TokenSources.getTokenStream(tpv);
      String result = highlighter.getBestFragments(tokenStream, text,
          maxNumFragmentsRequired, fragmentSeparator);
      System.out.println("\n" + result);
    }
    reader.close();

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      e1.printStackTrace();
    }
    
    long begin = System.currentTimeMillis();   
    
    TokenStream tokenStream = ss.tokenStream("", reader);
    try {
      while(tokenStream.incrementToken()){
//        TermAttribute termAttribute = tokenStream.getAttribute(TermAttribute.class);
//        System.out.println(termAttribute.toString());
        
      }
    } catch (IOException e) {

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      String text = hit.get(FIELD_NAME);
      int maxNumFragmentsRequired = 5;
      String fragmentSeparator = "...";
      TermPositionVector tpv = (TermPositionVector) reader
          .getTermFreqVector(docId, FIELD_NAME);
      TokenStream tokenStream = TokenSources.getTokenStream(tpv);
      String result = highlighter.getBestFragments(tokenStream, text,
          maxNumFragmentsRequired, fragmentSeparator);
      System.out.println("\n" + result);
    }
    reader.close();

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      LinkedList<CToken> list = new LinkedList<CToken>();
      int wordsCount = 0;
      
      //collect token
      TokenStream ts = analyzer.tokenStream("", reader);
      ts.reset();
      TermAttribute termAtt = (TermAttribute) ts
          .addAttribute(TermAttribute.class);
      while (ts.incrementToken()) {
        if (printGate != null && printGate.filter(wordsCount)) {
          list.add(new CToken(termAtt.term(), wordsCount));
        }
        wordsCount++;
      }

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      String text = hit.get(FIELD_NAME);
      int maxNumFragmentsRequired = 5;
      String fragmentSeparator = "...";
      TermPositionVector tpv = (TermPositionVector) reader
          .getTermFreqVector(docId, FIELD_NAME);
      TokenStream tokenStream = TokenSources.getTokenStream(tpv);
      String result = highlighter.getBestFragments(tokenStream, text,
          maxNumFragmentsRequired, fragmentSeparator);
      System.out.println("\n" + result);
    }
    reader.close();

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      String text = hit.get(FIELD_NAME);
      int maxNumFragmentsRequired = 5;
      String fragmentSeparator = "...";
      TermPositionVector tpv = (TermPositionVector) reader
          .getTermFreqVector(docId, FIELD_NAME);
      TokenStream tokenStream = TokenSources.getTokenStream(tpv);
      String result = highlighter.getBestFragments(tokenStream, text,
          maxNumFragmentsRequired, fragmentSeparator);
      System.out.println("\n" + result);
    }
    reader.close();

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