private FilteredCatalog Traverse(IComposablePartCatalogTraversal traversal)
{
Assumes.NotNull(traversal);
// we make sure that the underlyiong catalog cannot change while we are doing the trasversal
// After thaty traversal is done, the freeze is lifted, and the catalog is free to change, but the changes
// cannot affect partitioning
FreezeInnerCatalog();
try
{
traversal.Initialize();
var traversalClosure = GetTraversalClosure(_innerCatalog.Where(_filter), traversal);
return(new FilteredCatalog(_innerCatalog, p => traversalClosure.Contains(p)));
}
finally
{
UnfreezeInnerCatalog();
}
}
private static void GetTraversalClosure(IEnumerable <ComposablePartDefinition> parts, HashSet <ComposablePartDefinition> traversedParts, IComposablePartCatalogTraversal traversal)
{
foreach (var part in parts)
{
if (traversedParts.Add(part))
{
IEnumerable <ComposablePartDefinition> partsToTraverse = null;
if (traversal.TryTraverse(part, out partsToTraverse))
{
GetTraversalClosure(partsToTraverse, traversedParts, traversal);
}
}
}
}
private static HashSet <ComposablePartDefinition> GetTraversalClosure(IEnumerable <ComposablePartDefinition> parts, IComposablePartCatalogTraversal traversal)
{
Assumes.NotNull(traversal);
var traversedParts = new HashSet <ComposablePartDefinition>();
GetTraversalClosure(parts, traversedParts, traversal);
return(traversedParts);
}
private FilteredCatalog Traverse(IComposablePartCatalogTraversal traversal !!)
{
private static HashSet <ComposablePartDefinition> GetTraversalClosure(IEnumerable <ComposablePartDefinition> parts, IComposablePartCatalogTraversal traversal)
{
if (traversal == null)
{
throw new ArgumentNullException(nameof(traversal));
}
var traversedParts = new HashSet <ComposablePartDefinition>();
GetTraversalClosure(parts, traversedParts, traversal);
return(traversedParts);
}
