Class CJKTokenizer

  • All Implemented Interfaces:
    Closeable, AutoCloseable

    @Deprecated
    public final class CJKTokenizer
    extends Tokenizer
    Deprecated.
    Use StandardTokenizer, CJKWidthFilter, CJKBigramFilter, and LowerCaseFilter instead.
    CJKTokenizer is designed for Chinese, Japanese, and Korean languages.

    The tokens returned are every two adjacent characters with overlap match.

    Example: "java C1C2C3C4" will be segmented to: "java" "C1C2" "C2C3" "C3C4".

    Additionally, the following is applied to Latin text (such as English):
    • Text is converted to lowercase.
    • Numeric digits, '+', '#', and '_' are tokenized as letters.
    • Full-width forms are converted to half-width forms.
    For more info on Asian language (Chinese, Japanese, and Korean) text segmentation: please search google
    • Constructor Detail

      • CJKTokenizer

        public CJKTokenizer​(Reader in)
        Deprecated.
        Construct a token stream processing the given input.
        Parameters:
        in - I/O reader
    • Method Detail

      • incrementToken

        public boolean incrementToken()
                               throws IOException
        Deprecated.
        Returns true for the next token in the stream, or false at EOS. See http://java.sun.com/j2se/1.3/docs/api/java/lang/Character.UnicodeBlock.html for detail.
        Specified by:
        incrementToken in class TokenStream
        Returns:
        false for end of stream, true otherwise
        Throws:
        IOException - - throw IOException when read error
        happened in the InputStream
      • end

        public final void end()
        Deprecated.
        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.

        Overrides:
        end in class TokenStream
      • reset

        public void reset()
                   throws IOException
        Deprecated.
        Description copied from class: TokenStream
        Resets this stream to the beginning. This is an optional operation, so subclasses may or may not implement this method. TokenStream.reset() is not needed for the standard indexing process. However, if the tokens of a TokenStream are intended to be consumed more than once, it is necessary to implement TokenStream.reset(). Note that if your TokenStream caches tokens and feeds them back again after a reset, it is imperative that you clone the tokens when you store them away (on the first pass) as well as when you return them (on future passes after TokenStream.reset()).
        Overrides:
        reset in class TokenStream
        Throws:
        IOException
      • reset

        public void reset​(Reader reader)
                   throws IOException
        Deprecated.
        Description copied from class: Tokenizer
        Expert: Reset the tokenizer to a new reader. Typically, an analyzer (in its reusableTokenStream method) will use this to re-use a previously created tokenizer.
        Overrides:
        reset in class Tokenizer
        Throws:
        IOException