On Dec 27, 2005, at 5:51 PM, Dmitry Goldenberg wrote:
This is great. Now, just so I understand how rewrite applies. Are
there specific cases when the rewrite method should or should not
be invoked on the query before it is passed on to the search
method? Where I'm going with this is, if I have a UI which passes
the user query to the back end, can the back end always call
rewrite or not?
By looking at the code, it seems that things just get reinterpreted
as BooleanQuery's and such. I just want to know if there are any
pitfalls to watch out for.
It is safe, and wise, to always call Query.rewrite before
highlighting. No worries or pitfalls that I know of.
Erik
Thanks again,
- Dmitry
________________________________
From: Erik Hatcher [mailto:[EMAIL PROTECTED]
Sent: Tue 12/27/2005 12:13 PM
To: java-user@lucene.apache.org
Subject: Re: Wildcard and Fuzzy queries - no best fragments
generated - ??
On Dec 27, 2005, at 2:34 PM, Dmitry Goldenberg wrote:
What do you mean by _rewriting_ the query? I checked all the
classes in the highlighter package and did not see any mention of
having to rewrite.
From Highlighter's package.html in it's javadocs:
<pre>
IndexSearcher searcher = new IndexSearcher(ramDir);
Query query = QueryParser.parse("Kenne*", FIELD_NAME,
analyzer);
query = query.rewrite(reader); //required to expand search
terms
Hits hits = searcher.search(query);
Highlighter highlighter = new Highlighter(this, new
QueryScorer
(query));
for (int i = 0; i < hits.length(); i++)
{
String text = hits.doc(i).get(FIELD_NAME);
TokenStream tokenStream = analyzer.tokenStream
(FIELD_NAME, new
StringReader(text));
// Get 3 best fragments and seperate with a "..."
String result = highlighter.getBestFragments
(tokenStream, text, 3,
"...");
System.out.println(result);
}
</pre>
________________________________
From: Erik Hatcher [mailto:[EMAIL PROTECTED]
Sent: Tue 12/27/2005 11:03 AM
To: java-user@lucene.apache.org
Subject: Re: Wildcard and Fuzzy queries - no best fragments
generated - ??
You have to _rewrite_ the Query for this to work. This, I believe,
is mentioned in the javadocs.
I think you are hijacking a thread with your recent postings. Please
create a new message rather than reply to one and change the
subject. Thanks.
Erik
On Dec 27, 2005, at 1:55 PM, Dmitry Goldenberg wrote:
Hello,
While testing my code that integrates the Highlighter class from
org.apache.lucene.search.highlight, I found out that for wildcard
and fuzzy queries, it generates no best fragments.
Any particular reason why that is the case? Shouldn't the
highlighter be able to work just like with any other query and
highlight any matching token sequences? E.g. if I'm searching for
lava~, I'd expect it to highlight words like lava, java, etc. This
is the whole point of highlighting, is it not?
Thanks,
- Dmitry
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