I think, based on your previous question, that you just need to use
the search() method that returns TopDocs, not the lower-level
HitCollector method. From the TopDocs, you can then access the
ScoreDoc, which will give you info about the doc and the score. See http://www.lucenebootcamp.com/LuceneBootCamp/training/src/test/java/com/lucenebootcamp/training/basic/TopDocsTest.java
from my Lucene Boot Camp training class for a really simple example.
-Grant
On Nov 19, 2007, at 9:12 AM, Haroldo Nascimento wrote:
Mark,
How I can get the information of Document. I think that is in the
implementation do method abstract collect. How I can get it .
Below is the example of javadoc the Lucene.
Searcher searcher = new IndexSearcher(indexReader);
final BitSet bits = new BitSet(indexReader.maxDoc());
searcher.search(query, new HitCollector() {
public void collect(int doc, float score) {
bits.set(doc);
}
});
Thanks
On Nov 18, 2007 8:09 PM, Mark Miller <[EMAIL PROTECTED]> wrote:
Hey Haroldo.
First thing you need to do is *stop* using Hits in your searches.
Hits
is optimized for some pretty specific use cases and you will get
along
much better by using a HitCollector.
Hits has three main functions:
It caches documents, normalizes scores, and stores ids associated
with
scores (a HitDoc). If you attempt to retrieve a HitDoc past the first
100 from Hits, a new search will be issued to grab double the
required
HitDocs needed to satisfy your HitDoc retrieval attempt. This will be
repeated everytime you ask for a HitDoc beyond the current cache
(which
began at 100). This means that if you need to get a HitDoc beyond
100,
Hits is not a great choice for you. You will want to use the
HitCollector instead...but remember that you are losing the
normalized
scores (simple to copy code if you still want it) and the document
caching (I rarely want that anyway).
An issue to watch out for: with Hits, you do not have to ask for how
many docs to get back, but with a HitCollector solution you will need
to. This is a minor dilema if you want to go over all of the hits no
matter what. You can pass a huge number to ensure you get everything,
but you will be creating large data structures if you do this, as
structure sizes may be initialized by the number you pass. Also,
passing
the maximum integer will cause an error (negative init size) as
Lucene
initializes a data structure to hold the hits as n+1.
- Mark
Haroldo Nascimento wrote:
I have a problem of performance when I need group the result do
search
I have the code below:
for (int i = 0; i < hits.length(); i++) {
doc = hits.doc(i);
obj1 = doc.get(Constants.STATE_DESC_FIELD_LABEL);
obj2 = doc.get(xxx);
...
}
I work with volume of data very big. The search process in 0.300
seconds but when the object hits have much results, the time for get
all objects is very big. The command hits.doc(i) is processed in 2
second.
Por exemplo. For hits.length() equals the 25.000 results, the time
of "pos search" is 7 seconds.
I get all result because I need group the result (remove the
duplicate results).
Is there any form in Lucene that group the result. I need of
anything as the command "group by" of sql.
Thanks.
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--------------------------
Grant Ingersoll
http://lucene.grantingersoll.com
Lucene Helpful Hints:
http://wiki.apache.org/lucene-java/BasicsOfPerformance
http://wiki.apache.org/lucene-java/LuceneFAQ
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