Java Code Examples for org.apache.lucene.analysis.TokenStream#getAttributeImplsIterator()

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Example 1
Source File: Retriever.java    From lucene4ir with Apache License 2.0 6 votes vote down vote up 
/**
 * Returns the list of tokens extracted from the query string using the specified analyzer.
 *
 * @param field document field.
 *
 * @param queryTerms query string.
 *
 * @param distinctTokens if true, return the distinct tokens in the query string.
 *
 * @return the list of tokens extracted from the given query.
 *
 * @throws IOException
 */
List<String> getTokens(String field, String queryTerms, boolean distinctTokens) throws IOException {

    List<String> tokens = new ArrayList<String>();

    StringReader topicTitleReader = new StringReader(queryTerms);

    Set<String> seenTokens = new TreeSet<String>();

    TokenStream tok;
    tok = analyzer.tokenStream(field, topicTitleReader);
    tok.reset();
    while (tok.incrementToken()) {
        Iterator<AttributeImpl> atts = tok.getAttributeImplsIterator();
        AttributeImpl token = atts.next();
        String text = "" + token;
        if (seenTokens.contains(text) && distinctTokens) {
            continue;
        }
        seenTokens.add(text);
        tokens.add(text);
    }
    tok.close();

    return tokens;
}
Example 2
Source File: AnalysisImpl.java    From lucene-solr with Apache License 2.0 5 votes vote down vote up 
private List<TokenAttribute> copyAttributes(TokenStream tokenStream, CharTermAttribute charAtt) {
  List<TokenAttribute> attributes = new ArrayList<>();
  Iterator<AttributeImpl> itr = tokenStream.getAttributeImplsIterator();
  while(itr.hasNext()) {
    AttributeImpl att = itr.next();
    Map<String, String> attValues = new LinkedHashMap<>();
    att.reflectWith((attClass, key, value) -> {
      if (value != null)
        attValues.put(key, value.toString());
    });
    attributes.add(new TokenAttribute(att.getClass().getSimpleName(), attValues));
  }
  return attributes;
}