Re: In a functon query, I can't get the ValueSource when extend ValueSourceParser

[sling]

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




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