Examples with TaxonomyFacetSumValueSource org.apache.lucene.facet.taxonomy.TaxonomyFacetSumValueSource used on opensource projects

Example 1 with TaxonomyFacetSumValueSource

use of org.apache.lucene.facet.taxonomy.TaxonomyFacetSumValueSource in project lucene-solr by apache.

the class ExpressionAggregationFacetsExample method search.

/** User runs a query and aggregates facets. */
private FacetResult search() throws IOException, ParseException {
    DirectoryReader indexReader = DirectoryReader.open(indexDir);
    IndexSearcher searcher = new IndexSearcher(indexReader);
    TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);
    // Aggregate categories by an expression that combines the document's score
    // and its popularity field
    Expression expr = JavascriptCompiler.compile("_score * sqrt(popularity)");
    SimpleBindings bindings = new SimpleBindings();
    // the score of the document
    bindings.add(new SortField("_score", SortField.Type.SCORE));
    // the value of the 'popularity' field
    bindings.add(new SortField("popularity", SortField.Type.LONG));
    // Aggregates the facet values
    FacetsCollector fc = new FacetsCollector(true);
    // MatchAllDocsQuery is for "browsing" (counts facets
    // for all non-deleted docs in the index); normally
    // you'd use a "normal" query:
    FacetsCollector.search(searcher, new MatchAllDocsQuery(), 10, fc);
    // Retrieve results
    Facets facets = new TaxonomyFacetSumValueSource(taxoReader, config, fc, expr.getDoubleValuesSource(bindings));
    FacetResult result = facets.getTopChildren(10, "A");
    indexReader.close();
    taxoReader.close();
    return result;
}