/// <summary>User runs a query and counts facets.</summary>
private IList <FacetResult> Search()
{
using DirectoryReader indexReader = DirectoryReader.Open(indexDir);
IndexSearcher searcher = new IndexSearcher(indexReader);
SortedSetDocValuesReaderState state = new DefaultSortedSetDocValuesReaderState(indexReader);
// Aggregatses the facet counts
FacetsCollector fc = new FacetsCollector();
// 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 SortedSetDocValuesFacetCounts(state, fc);
IList <FacetResult> results = new List <FacetResult>
{
facets.GetTopChildren(10, "Author"),
facets.GetTopChildren(10, "Publish Year")
};
return(results);
}
/// <summary>User drills down on 'Publish Year/2010'.</summary>
private FacetResult DrillDown()
{
using DirectoryReader indexReader = DirectoryReader.Open(indexDir);
IndexSearcher searcher = new IndexSearcher(indexReader);
SortedSetDocValuesReaderState state = new DefaultSortedSetDocValuesReaderState(indexReader);
// Now user drills down on Publish Year/2010:
DrillDownQuery q = new DrillDownQuery(config);
q.Add("Publish Year", "2010");
FacetsCollector fc = new FacetsCollector();
FacetsCollector.Search(searcher, q, 10, fc);
// Retrieve results
Facets facets = new SortedSetDocValuesFacetCounts(state, fc);
FacetResult result = facets.GetTopChildren(10, "Author");
return(result);
}
