Thanks a lot for your reply, Chris.
I was trying to sort the query result by the Datefunction, by passing
q={!boost b=dateDeboost()}title:test to the /select request-handler.
Before, my custom DateFunction is like this:
public class DateFunction extends FieldCacheSource {
private static final long serialVersionUID = 6752223682280098130L;
private static long now;
public DateFunction(String field) {
super(field);
now = System.currentTimeMillis();
}
@Override
public FunctionValues getValues(Map context,
AtomicReaderContext readerContext) throws IOException {
long[] times = cache.getLongs(readerContext.reader(), field,
false);
final float[] weights = new float[times.length];
for (int i = 0; i < times.length; i++) {
weights[i] = ScoreUtils.getNewsScoreFactor(now,
times[i]);
}
return new FunctionValues() {
@Override
public float floatVal(int doc) {
return weights[doc];
}
};
}
}
It calculate every documet's date-weight, but at the same time , it only
need the one doc's date-weight, so it run slowly.
When I see the source code of recip function in
org.apache.solr.search.ValueSourceParser, like this:
addParser("recip", new ValueSourceParser() {
@Override
public ValueSource parse(FunctionQParser fp) throws SyntaxError {
ValueSource source = fp.parseValueSource();
float m = fp.parseFloat();
float a = fp.parseFloat();
float b = fp.parseFloat();
return new ReciprocalFloatFunction(source, m, a, b);
}
});
and in the ReciprocalFloatFunction, it get the value like this:
@Override
public FunctionValues getValues(Map context, AtomicReaderContext
readerContext) throws IOException {
final FunctionValues vals = source.getValues(context, readerContext);
return new FloatDocValues(this) {
@Override
public float floatVal(int doc) {
return a/(m*vals.floatVal(doc) + b);
}
@Override
public String toString(int doc) {
return Float.toString(a) + "/("
+ m + "*float(" + vals.toString(doc) + ')'
+ '+' + b + ')';
}
};
}
So I think this is what I want.
When calculate a doc's date-weight, I needn't "cache.getLongs(xxxxx)",
instead, I should "source.getValues(xxx)"
Therefore I change my code, but when fp.parseValueSource(), it throws an
error like this:
org.apache.solr.search.SyntaxError: Expected identifier at pos 12
str='dateDeboost()'
Do I describe clearly this time?
Thanks again!
sling
--
View this message in context:
http://lucene.472066.n3.nabble.com/In-a-functon-query-I-can-t-get-the-ValueSource-when-extend-ValueSourceParser-tp4103026p4103207.html
Sent from the Solr - User mailing list archive at Nabble.com.
