/// <summary>
/// Searches the Lucene index for Documents that match the specified search criteria.
/// </summary>
/// <param name="criteria">The search criteria.</param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="System.ArgumentNullException"></exception>
public SearchResult<Guid> Search(SearchCriteria criteria)
{
if (criteria == null)
throw new ArgumentNullException(nameof(criteria));
criteria.Query = String.IsNullOrWhiteSpace(criteria.Query) ? ALL_DOCS_QUERY : criteria.Query;
criteria.TopN = criteria.TopN > 0 ? criteria.TopN : SearchCriteria.DEFAULT_TOP_N;
criteria.ItemsPerPage = criteria.ItemsPerPage > 0 ? criteria.ItemsPerPage : SearchCriteria.DEFAULT_ITEMS_PER_PAGE;
criteria.PageNumber = criteria.PageNumber > 0 ? criteria.PageNumber : 1;
criteria.Validate();
var result = new SearchResult<Guid>(criteria);
var queryParser = new LuceneQueryParser(Schema.StandardField.FULL_TEXT, _compositeAnalyzer, Schema);
var query = queryParser.Parse(criteria.Query);
var instance = _searcherTaxonomyManager.Acquire() as SearcherTaxonomyManagerSearcherAndTaxonomy;
if (instance != null)
{
var searcher = instance.Searcher;
var taxonomyReader = instance.TaxonomyReader;
try
{
var sort = GetSortCriteria(criteria.SortByField);
var selectedFacets = criteria.SelectCategories.ToFacetFields();
var topDocs = (TopDocs)null;
var categories = (IEnumerable<Category>)null;
if (selectedFacets.Count() == 0)
{
// We are not going to do a drill-down on specific facets.
// Instead we will just take the top N facets from the matching Documents.
var facetsCollector = new FacetsCollector();
// Get the matching Documents
topDocs = FacetsCollector.Search(searcher, query, criteria.TopN, sort, facetsCollector);
// Get the Facet counts from the matching Documents
var facetCounts = new FastTaxonomyFacetCounts(taxonomyReader, _facetBuilder.FacetsConfig, facetsCollector);
categories = facetCounts.GetCategories(criteria.TopNCategories);
}
else
{
// Perform a drill-sideways query
var drillDownQuery = new DrillDownQuery(_facetBuilder.FacetsConfig, query);
foreach (var facetField in selectedFacets)
drillDownQuery.Add(facetField.Dim, facetField.Path);
var drillSideways = new DrillSideways(searcher, _facetBuilder.FacetsConfig, taxonomyReader);
var drillSidewaysResult = drillSideways.Search(drillDownQuery, null, null, criteria.TopN, sort, false, false);
// Get the matching documents
topDocs = drillSidewaysResult.Hits;
// Get the Facet counts from the matching Documents
categories = drillSidewaysResult.Facets.GetCategories(criteria.TopNCategories, selectedFacets);
}
// TODO: Don't pass TopDocs; pass an IEnumerable<Guid>
result.PopulateWith(topDocs, categories, id => searcher.Doc(id));
}
finally
{
_searcherTaxonomyManager.Release(instance);
searcher = null;
taxonomyReader = null;
}
}
return result;
}