epotyom commented on code in PR #14237:
URL: https://github.com/apache/lucene/pull/14237#discussion_r1960058010
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lucene/demo/src/java/org/apache/lucene/demo/facet/SandboxFacetsExample.java:
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@@ -130,6 +135,88 @@ void index() throws IOException {
IOUtils.close(indexWriter, taxoWriter);
}
+ /**
+ * Example for {@link FacetBuilder} usage - simple API that provides results
in a format very
+ * similar to classic facets module. It doesn't give all flexibility
available with {@link
+ * org.apache.lucene.sandbox.facet.cutters.FacetCutter} and {@link
+ * org.apache.lucene.sandbox.facet.recorders.FacetRecorder} though, see
below for lower level API
+ * usage examples.
+ */
+ private List<FacetResult> simpleFacetsWithSearch() throws IOException {
+ //// init readers and searcher
+ DirectoryReader indexReader = DirectoryReader.open(indexDir);
+ IndexSearcher searcher = new IndexSearcher(indexReader);
+ TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);
+
+ //// build facets requests
+ FacetBuilder authorFacetBuilder =
+ new TaxonomyFacetBuilder(config, taxoReader, "Author").withTopN(10);
+ FacetBuilder priceFacetBuilder =
+ LongRangeFacetBuilder.create(
+ "Price",
+ new LongRange("0-10", 0, true, 10, true),
+ new LongRange("10-20", 10, true, 20, true));
+
+ //// Main hits collector
+ TopScoreDocCollectorManager hitsCollectorManager =
+ new TopScoreDocCollectorManager(2, Integer.MAX_VALUE);
+
+ //// Search and collect
+ TopDocs topDocs =
+ new FacetOrchestrator()
+ .addBuilder(authorFacetBuilder)
+ .addBuilder(priceFacetBuilder)
+ .collect(new MatchAllDocsQuery(), searcher, hitsCollectorManager);
+ System.out.println(
+ "Search results: totalHits: "
+ + topDocs.totalHits
+ + ", collected hits: "
+ + topDocs.scoreDocs.length);
+
+ //// Results
+ FacetResult autorResults = authorFacetBuilder.getResult();
+ FacetResult rangeResults = priceFacetBuilder.getResult();
+
+ IOUtils.close(indexReader, taxoReader);
+
+ return List.of(autorResults, rangeResults);
+ }
+
+ /** Example for {@link FacetBuilder} usage with {@link DrillSideways}. */
+ private List<FacetResult> simpleFacetsWithDrillSideways() throws IOException
{
+ //// init readers and searcher
+ DirectoryReader indexReader = DirectoryReader.open(indexDir);
+ IndexSearcher searcher = new IndexSearcher(indexReader);
+ TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);
+ DrillSideways ds = new DrillSideways(searcher, config, taxoReader);
+
+ //// build facets requests
+ FacetBuilder authorFacetBuilder =
+ new TaxonomyFacetBuilder(config, taxoReader, "Author").withTopN(10);
+ FacetBuilder priceFacetBuilder =
+ LongRangeFacetBuilder.create(
+ "Price",
+ new LongRange("0-10", 0, true, 10, true),
+ new LongRange("10-20", 10, true, 20, true));
+
Review Comment:
I did this intentionally, to demonstrate that there are methods to do facet
only and facets with search (examples that have`WithSearch` suffix also
compute/print TopDocs). We can rename this example to
`simpleFacetsOnlyWithDrillSideways` maybe?
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