/**
* Recursive into children. The parent of each stored TemplateThing are not meaningful for a tree;
* only the children are meaningful.
*/
public HashMap<String, TemplateThing> getUniqueTypes(final HashMap<String, TemplateThing> ht) {
if (ht.containsKey(this.type)) return ht;
ht.put(this.type, this);
if (null == al_children || al_children.isEmpty()) return ht;
for (final TemplateThing tt : al_children) {
tt.getUniqueTypes(ht);
}
return ht;
}
