Len Takeuchi-2 wrote:
>
> Im using Lucene 2.4.1 and Im trying to use a custom HitCollector to
> collect
> only the first N hits (not the best hits) for performance. I saw another
> e-mail in this group where they mentioned writing a HitCollector which
> throws
> an exception after N hits to do this. So I tried this approach and it
> seems
> as if my HitCollector isnt called until the hits have been determined,
> i.e.
> the time until my HitCollector is called is dependent on the number of
> hits
> and my performance is no better than when I was not using a custom
> HitCollector.
>
>
In my case count of found hits was required, so there was no throwing
exception.
/**
* Hit collector to collect only first docs ignoring score
* @author Rafis
*/
public class LimitedHitCollector extends HitCollector {
public final int capacity;
public final int[] docs;
private int count;
public LimitedHitCollector(int capacity) {
this.capacity = capacity;
docs = new int[capacity];
}
@Override
public void collect(int doc, float score) {
if (count < capacity)
docs[count] = doc;
// else
// throw custom exception here to break search, if you do
not need real
count
count++;
}
/**
* @return Number of collected docs
*/
public int getSize() {
return Math.min(count, capacity);
}
/**
* @return Number of found docs
*/
public int getCount() {
return count;
}
}
Add throwing exception in collect(int doc, float score) to break search:
@Override
public void collect(int doc, float score) {
if (count < capacity)
docs[count++] = doc;
else
throw new SomeRuntimeException();
}
And catch it from search.
Regards,
Rafis
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