/// <summary>
/// Converts the FacetResult object to a <see cref="Category"/> object.
/// </summary>
/// <param name="facetResult">The FacetResult object.</param>
/// <returns></returns>
public static Category ToCategory(this FacetResult facetResult)
{
if (facetResult == null)
throw new ArgumentNullException(nameof(facetResult));
var category = new Category
{
Name = facetResult.Dim,
Count = facetResult.Value.intValue()
};
if (category.Count < 0)
category.Count = null;
if (facetResult.ChildCount > 0)
{
category.Values = new List<Category>();
foreach (var value in facetResult.LabelValues)
category.Values.Add(new Category { Name = value.Label, Count = value.Value.intValue() });
category.Count = category.Values.Sum(sc => sc.Count);
}
return category;
}
/// <summary>
/// Gets the Categories from the Facets object.
/// </summary>
/// <param name="facets">The Facets.</param>
/// <param name="topNCategories">The top N categories to extract.</param>
/// <param name="selectedFacets">The selected facets.</param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentException">{nameof(topNCategories)}</exception>
public static IEnumerable<Category> GetCategories(this Facets facets, int topNCategories, IEnumerable<FacetField> selectedFacets)
{
if (facets == null)
throw new ArgumentException(nameof(facets));
if (topNCategories <= 0)
throw new ArgumentException($"{nameof(topNCategories)} cannot be zero or less.");
if (selectedFacets == null)
throw new ArgumentException(nameof(selectedFacets));
var categories = new List<Category>();
var allDims = facets.GetAllDims(topNCategories);
for (var i = 0; i < allDims.size(); i++)
{
// Get the category (facet) names
var fc = allDims.get(i) as FacetResult;
if (fc != null)
{
var category = fc.ToCategory();
// Check if the current category/facet is one of the categories
// that the user wants to drill-down to.
var facetToDrillDownTo = selectedFacets.FirstOrDefault(f => f.Dim == category.Name);
if (facetToDrillDownTo != null &&
(facetToDrillDownTo.Path?.Length ?? 0) > 0)
{
// If yes, then we want to get the names and counts of all category child values.
// Do this by traversing the facet path.
var currentCategory = category;
for (var j = 0; j < facetToDrillDownTo.Path.Length; j++)
{
var currentFacetPath = facetToDrillDownTo.Path.Take(j + 1).ToArray();
var childFacetResult = facets.GetTopChildren(topNCategories, facetToDrillDownTo.Dim, currentFacetPath);
if (childFacetResult == null)
break;
if (childFacetResult.ChildCount > 0)
{
var childName = currentFacetPath.Last();
if (currentCategory.Values == null)
currentCategory.Values = new List<Category>();
var childCategory = currentCategory.Values.FirstOrDefault(c => c.Name == childName);
if (childCategory == null)
{
childCategory = new Category { Name = childName };
currentCategory.Values.Add(childCategory);
}
if (childCategory.Values == null)
childCategory.Values = new List<Category>();
foreach (var lv in childFacetResult.LabelValues)
childCategory.Values.Add(new Category { Name = lv.Label, Count = lv.Value.intValue() });
childCategory.Count = childCategory.Values.Sum(sc => sc.Count);
currentCategory = childCategory;
}
}
}
categories.Add(category);
}
}
return categories;
}
