Class FilteringTokenFilter

    • Constructor Detail

      • FilteringTokenFilter

        @Deprecated
        public FilteringTokenFilter​(Version version,
                                    boolean enablePositionIncrements,
                                    TokenStream input)
        Deprecated.
        enablePositionIncrements=false is not supported anymore as of Lucene 4.4
        Create a new FilteringTokenFilter.
        Parameters:
        version - the Lucene match version
        enablePositionIncrements - whether to increment position increments when filtering out terms
        input - the input to consume
    • Method Detail

      • incrementToken

        public final boolean incrementToken()
                                     throws java.io.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
        Returns:
        false for end of stream; true otherwise
        Throws:
        java.io.IOException
      • reset

        public void reset()
                   throws java.io.IOException
        Description copied from class: TokenFilter
        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).

        NOTE: The default implementation chains the call to the input TokenStream, so be sure to call super.reset() when overriding this method.

        Overrides:
        reset in class TokenFilter
        Throws:
        java.io.IOException
      • setEnablePositionIncrements

        @Deprecated
        public void setEnablePositionIncrements​(boolean enable)
        Deprecated.
        enablePositionIncrements=false is not supported anymore as of Lucene 4.4
        If true, this TokenFilter will preserve positions of the incoming tokens (ie, accumulate and set position increments of the removed tokens). Generally, true is best as it does not lose information (positions of the original tokens) during indexing.

        When set, when a token is stopped (omitted), the position increment of the following token is incremented.

        NOTE: be sure to also set org.apache.lucene.queryparser.classic.QueryParser#setEnablePositionIncrements if you use QueryParser to create queries.

      • end

        public void end()
                 throws java.io.IOException
        Description copied from class: TokenFilter
        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().

        NOTE: The default implementation chains the call to the input TokenStream, so be sure to call super.end() first when overriding this method.

        Overrides:
        end in class TokenFilter
        Throws:
        java.io.IOException - If an I/O error occurs