// Gets the value at the given property path segment
private object _getSegmentValue(BplObject source, BplPropertyPath.PathSegment segment) {
if (source != null) {
var property = source.Class.GetProperty(segment.Name);
if (property != null) {
var value = property.GetValue(source);
if (segment.IsA<BplPropertyPath.SingleItemSegment>()) {
return value;
} else {
var collection = value as IBplCollection;
if (collection != null) {
if (segment.IsA<BplPropertyPath.CollectionSegment>()) {
return collection;
} else if (segment.IsA<BplPropertyPath.IndexedItemSegment>()) {
var index = ((BplPropertyPath.IndexedItemSegment)segment).Index;
if (index >= 0 && index < collection.Count) {
return collection[index];
}
} else if (segment.IsA<BplPropertyPath.CurrentItemSegment>()) {
var collectionView = CollectionViewSource.GetDefaultView(collection);
if (collectionView != null) {
return collectionView.CurrentItem;
}
}
}
}
}
}
return DependencyProperty.UnsetValue;
}
