Class ChineseFilter

  • All Implemented Interfaces:
    Closeable, AutoCloseable

    public final class ChineseFilter
    extends TokenFilter
    (3.1) Use StopFilter instead, which has the same functionality. This filter will be removed in Lucene 5.0
    A TokenFilter with a stop word table.
    • Numeric tokens are removed.
    • English tokens must be larger than 1 character.
    • One Chinese character as one Chinese word.
    TO DO:
    1. Add Chinese stop words, such as 
    2. Dictionary based Chinese word extraction
    3. Intelligent Chinese word extraction
    • Field Detail

      • STOP_WORDS

        public static final String[] STOP_WORDS
    • Constructor Detail

      • ChineseFilter

        public ChineseFilter​(TokenStream in)
    • Method Detail

      • incrementToken

        public boolean incrementToken()
                               throws IOException
        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