abstractpublic class SpanFilter extends Filter(Code)
Abstract base class providing a mechanism to restrict searches to a subset
of an index and also maintains and returns position information.
This is useful if you want to compare the positions from a SpanQuery with the positions of items in
a filter. For instance, if you had a SpanFilter that marked all the occurrences of the word "foo" in documents,
and then you entered a new SpanQuery containing bar, you could not only filter by the word foo, but you could
then compare position information for post processing.
bitSpans(IndexReader reader) Returns a SpanFilterResult with true for documents which should be permitted in
search results, and false for those that should not and Spans for where the true docs match.
Returns a SpanFilterResult with true for documents which should be permitted in
search results, and false for those that should not and Spans for where the true docs match.
Parameters: reader - The org.apache.lucene.index.IndexReader to load position and bitset information from A SpanFilterResult throws: java.io.IOException - if there was an issue accessing the necessary information
Methods inherited from org.apache.lucene.search.Filter