public static async Task <CategoryTree> Build(IAsyncEnumerable <Category> data, CancellationToken cancellationToken = default)
{
CategoryTree.CategoryTreeNode root = new CategoryTree.CategoryTreeNode(new Category());
await foreach (var v in data)
{
cancellationToken.ThrowIfCancellationRequested();
CategoryTree.CategoryTreeNode node = root;
foreach (var k in v.Items)
{
if (!node.Children.ContainsKey(k))
{
CategoryBuilder cb = new CategoryBuilder();
cb.AddSubCategory(node.Category.Items.Concat(new[] { k }).ToArray());
Category c = cb.Build();
var tn = new CategoryTree.CategoryTreeNode(c);
node.Children.Add(k, tn);
node = tn;
}
else
{
node = node.Children[k];
}
}
}
return(new CategoryTree(root));
}
public static async Task <(CategoryTree, IReadOnlyDictionary <CategoryTree.CategoryTreeNode, IList <Post> >)> BuildFromPosts(IAsyncEnumerable <Post> data, CancellationToken cancellationToken = default)
{
CategoryTree.CategoryTreeNode root = new CategoryTree.CategoryTreeNode(new Category());
Dictionary <CategoryTree.CategoryTreeNode, IList <Post> > map = new Dictionary <CategoryTree.CategoryTreeNode, IList <Post> >();
await foreach (var v in data)
{
cancellationToken.ThrowIfCancellationRequested();
CategoryTree.CategoryTreeNode node = root;
foreach (var k in v.Category.Items)
{
if (!node.Children.ContainsKey(k))
{
CategoryBuilder cb = new CategoryBuilder();
cb.AddSubCategory(node.Category.Items.Concat(new[] { k }).ToArray());
Category c = cb.Build();
var tn = new CategoryTree.CategoryTreeNode(c);
map.Add(tn, new List <Post>());
node.Children.Add(k, tn);
node = tn;
}
else
{
node = node.Children[k];
}
map[node].Add(v);
}
}
return(new CategoryTree(root), map);
}
