TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoWriter);
taxoWriter.close();
// Count both "Publish Date" and "Author" dimensions:
FacetSearchParams fsp = new FacetSearchParams(
new CountFacetRequest(new CategoryPath("Publish Date"), 10),
new CountFacetRequest(new CategoryPath("Author"), 10));
// Aggregate the facet counts:
FacetsCollector c = FacetsCollector.create(fsp, searcher.getIndexReader(), taxoReader);
// MatchAllDocsQuery is for "browsing" (counts facets
// for all non-deleted docs in the index); normally
// you'd use a "normal" query, and use MultiCollector to
// wrap collecting the "normal" hits and also facets:
searcher.search(new MatchAllDocsQuery(), c);
// Retrieve & verify results:
List<FacetResult> results = c.getFacetResults();
assertEquals(2, results.size());
assertEquals("Publish Date (0)\n 2012 (2)\n 2010 (2)\n 1999 (1)\n",
FacetTestUtils.toSimpleString(results.get(0)));
assertEquals("Author (0)\n Lisa (2)\n Frank (1)\n Susan (1)\n Bob (1)\n",
FacetTestUtils.toSimpleString(results.get(1)));
// Now user drills down on Publish Date/2010:
fsp = new FacetSearchParams(new CountFacetRequest(new CategoryPath("Author"), 10));
DrillDownQuery q2 = new DrillDownQuery(fsp.indexingParams, new MatchAllDocsQuery());
q2.add(new CategoryPath("Publish Date/2010", '/'));
c = FacetsCollector.create(fsp, searcher.getIndexReader(), taxoReader);
searcher.search(q2, c);
results = c.getFacetResults();
assertEquals(1, results.size());
assertEquals("Author (0)\n Lisa (1)\n Bob (1)\n",