As your DateSourceParser is put in standardValueSourceParsers map with key
"dateDeboost" (right?), I think you need specify name of your source like
"dateDeboost(title)".
26.11.2013, 06:46, "sling" <sling...@gmail.com>:
> 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.
