/// <summary>
/// Creates trees of view models that represents the hierarchy of the given taxa.
/// A method delegate for creating a taxon view model should be provided.
/// If the method returns null, the taxon won't be included in the tree.
/// The taxa hierarchy is traversed in a breadth-first manner so the ordering of the taxa in each level is preserved.
/// </summary>
/// <param name="taxa">The taxa.</param>
/// <param name="viewModelBuilder">A method that creates a taxon view model by given taxon.
/// If null is returned, the taxon won't be included in the tree.</param>
/// <param name="sort">The sort.</param>
/// <param name="manager">The taxonomy manager that will be used to retrieve the children.</param>
/// <param name="taxaCountLimit">The maximum number of taxa that will be included in the tree.</param>
/// <returns></returns>
public static IList <TaxonViewModel> BuildTaxaTree(
IQueryable <Taxon> taxa,
Func <ITaxon, TaxonViewModel> viewModelBuilder,
Func <IQueryable <Taxon>, IQueryable <Taxon> > sort,
TaxonomyManager manager,
int taxaCountLimit)
{
var sortedTaxa = sort.Invoke(taxa);
var trees = new List <TaxonViewModel>();
var currentTaxaCount = 0;
foreach (var taxon in sortedTaxa)
{
var subTree = TaxaViewModelTreeBuilder.BuildTaxaTreeBfs(taxon, viewModelBuilder, sort, manager, taxaCountLimit, ref currentTaxaCount);
if (subTree != null)
{
trees.Add(subTree);
}
if (taxaCountLimit > 0 && currentTaxaCount >= taxaCountLimit)
{
break;
}
}
return(trees);
}
/// <summary>
/// Gets the view models of the given taxa.
/// </summary>
/// <param name="statistics">The statistics.</param>
/// <param name="taxa">The taxa.</param>
/// <returns>Returns flat or hierarchical structure based on the widget settings.</returns>
protected virtual IList <TaxonViewModel> GetTaxaViewModels(IQueryable <TaxonomyStatistic> statistics, IQueryable <Taxon> taxa)
{
if (this.FlattenHierarchy)
{
var sortedTaxa = this.Sort(taxa);
return(this.GetFlatTaxaViewModelsWithStatistics(sortedTaxa, statistics));
}
return(TaxaViewModelTreeBuilder.BuildTaxaTree(
taxa,
taxon =>
{
if (!this.HasTranslationInCurrentLanguage(taxon))
{
return null;
}
return this.FilterTaxonByCount(taxon, statistics);
},
t => this.Sort(t),
this.CurrentTaxonomyManager,
this.TaxaCountLimit));
}
