12 okt 2007 kl. 03.09 skrev Chris Hostetter:
: No, sorry, I'm still confused. It ought to be a term queries?
: > > System.out.println(new QueryParser("f", new Analyzer() {
: > > public TokenStream tokenStream(String string, Reader reader) {
: > > return new NGramTokenFilter(new StandardTokenizer
(reader), 2, 5);
: > > }
: > > }).parse("hello world"));
query parser does one pass looking for operators, it sees two
pieces of
input: "hello" and "world" it hands each individually to your
analyzer.
for each word, your analyzer produces multiple tokens -- which are
not at
the same position (they have non zero positionIncrimentGap)
QueryParser
sees the multiple tokens at consecutive positions, and constructs a
phrase
query (per word). if there was at least one token with a
positionIncriment of 0, it would have created a MultiPhraseQuery (per
word), if all had 0 positionIncriments, it would have constructed a
BooleanQuery (per word) containing TermQueries.
Thanks!
--
karl
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