/**
* @param tree
* @return
*/
@Pure
@ExtensionMethod
@ReturnNonnull
@Recursive
public static <T> AbstractUnmodifiableIterable<T> NodeValuesPostOrder(final IMultiTree<T> tree) {
com.google.common.base.Preconditions.checkNotNull(tree);
if (tree.IsTreeNode()) {
final IMultiTreeNode<T> treeNode = tree.AsTreeNode();
assert treeNode != null;
return Iterables.Concat(
Iterables.Concat(
Iterables.Map(
treeNode.GetSubtrees(),
new Func1<IMultiTree<T>, Iterable<T>>() {
@Override
public Iterable<T> DoFunc(final IMultiTree<T> input) {
assert input != null;
return MultiTrees.NodeValuesPreOrder(input);
}
})),
treeNode.GetNodeValue());
} else {
assert tree.IsEmptyTree();
return Iterables.EmptyUnmodifiableIterable();
}
}
/**
* @param tree
* @return
*/
@SuppressWarnings("unchecked")
@Pure
@CheckForNull
@ExtensionMethod
public static <T> IMultiTreeNode<T> AsMultiTreeNodeWhenReadOnly(
@Nullable final IMultiTree<? extends T> tree) {
return MultiTrees.SafeCastWhenReadOnly(tree.AsTreeNode());
}