Class ClassicTokenizer

  • All Implemented Interfaces:, java.lang.AutoCloseable

    public final class ClassicTokenizer
    extends Tokenizer
    A grammar-based tokenizer constructed with JFlex

    This should be a good tokenizer for most European-language documents:

    • Splits words at punctuation characters, removing punctuation. However, a dot that's not followed by whitespace is considered part of a token.
    • Splits words at hyphens, unless there's a number in the token, in which case the whole token is interpreted as a product number and is not split.
    • Recognizes email addresses and internet hostnames as one token.

    Many applications have specific tokenizer needs. If this tokenizer does not suit your application, please consider copying this source code directory to your project and maintaining your own grammar-based tokenizer. ClassicTokenizer was named StandardTokenizer in Lucene versions prior to 3.1. As of 3.1, StandardTokenizer implements Unicode text segmentation, as specified by UAX#29.

    • Constructor Detail

      • ClassicTokenizer

        public ClassicTokenizer​(Version matchVersion,
        Creates a new instance of the ClassicTokenizer. Attaches the input to the newly created JFlex scanner.
        input - The input reader See
    • Method Detail

      • setMaxTokenLength

        public void setMaxTokenLength​(int length)
        Set the max allowed token length. Any token longer than this is skipped.
      • incrementToken

        public final boolean incrementToken()
        Description copied from class: TokenStream
        Consumers (i.e., IndexWriter) use this method to advance the stream to the next token. Implementing classes must implement this method and update the appropriate AttributeImpls with the attributes of the next token.

        The producer must make no assumptions about the attributes after the method has been returned: the caller may arbitrarily change it. If the producer needs to preserve the state for subsequent calls, it can use AttributeSource.captureState() to create a copy of the current attribute state.

        This method is called for every token of a document, so an efficient implementation is crucial for good performance. To avoid calls to AttributeSource.addAttribute(Class) and AttributeSource.getAttribute(Class), references to all AttributeImpls that this stream uses should be retrieved during instantiation.

        To ensure 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 TokenStream.incrementToken().

        Specified by:
        incrementToken in class TokenStream
        false for end of stream; true otherwise
      • end

        public final void end()
        Description copied from class: TokenStream
        This method is called by the consumer after the last token has been consumed, after TokenStream.incrementToken() returned false (using the new TokenStream API). Streams implementing the old API should upgrade to use this feature.

        This method can be used to perform any end-of-stream operations, such as setting the final offset of a stream. The final offset of a stream might differ from the offset of the last token eg in case one or more whitespaces followed after the last token, but a WhitespaceTokenizer was used.

        Additionally any skipped positions (such as those removed by a stopfilter) can be applied to the position increment, or any adjustment of other attributes where the end-of-stream value may be important.

        If you override this method, always call super.end().

        end in class TokenStream
        Throws: - If an I/O error occurs
      • close

        public void close()
        Description copied from class: Tokenizer
        Releases resources associated with this stream.

        If you override this method, always call super.close(), otherwise some internal state will not be correctly reset (e.g., Tokenizer will throw IllegalStateException on reuse).

        NOTE: The default implementation closes the input Reader, so be sure to call super.close() when overriding this method.

        Specified by:
        close in interface java.lang.AutoCloseable
        Specified by:
        close in interface
        close in class Tokenizer
      • reset

        public void reset()
        Description copied from class: TokenStream
        This method is called by a consumer before it begins consumption using TokenStream.incrementToken().

        Resets this stream to a clean state. Stateful implementations must implement this method so that they can be reused, just as if they had been created fresh.

        If you override this method, always call super.reset(), otherwise some internal state will not be correctly reset (e.g., Tokenizer will throw IllegalStateException on further usage).

        reset in class Tokenizer