Example usage for org.apache.lucene.queries.function.valuesource SumFloatFunction SumFloatFunction

Introduction

In this page you can find the example usage for org.apache.lucene.queries.function.valuesource SumFloatFunction SumFloatFunction.

Prototype

public SumFloatFunction(ValueSource[] sources) 

Source Link

Usage

From source file:com.ifactory.press.db.solr.HitCount.java

License:Apache License

@Override
public ValueSource parse(FunctionQParser fp) throws SyntaxError {
    // hitcount() takes no arguments.  If we wanted to pass a query
    // we could call fp.parseNestedQuery()
    HashSet<String> fields = new HashSet<String>();
    while (fp.hasMoreArguments()) {
        fields.add(fp.parseArg());/*from  w  w w .j av a  2 s  . co m*/
    }
    Query q = fp.subQuery(fp.getParams().get("q"), "lucene").getQuery();
    HashSet<Term> terms = new HashSet<Term>();
    try {
        q.extractTerms(terms);
    } catch (UnsupportedOperationException e) {
        return new DoubleConstValueSource(1);
    }
    ArrayList<ValueSource> termcounts = new ArrayList<ValueSource>();
    for (Term t : terms) {
        if (fields.isEmpty() || fields.contains(t.field())) {
            termcounts.add(new TermFreqValueSource(t.field(), t.text(), t.field(), t.bytes()));
        }
    }
    return new SumFloatFunction(termcounts.toArray(new ValueSource[termcounts.size()]));
}

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