Added JavaTrieNodeCounts.

JavaTriesWithFrequencies.m

@@ -140,6 +140,8 @@ Mathematica is (C) Copyright 1988-2017 Wolfram Research, Inc.
 
 JavaTrieMerge::usage = "Merges two Java tries."
 
+JavaTrieNodeCounts::usage = "Returns the node counts in trie (total, internal, leaves.)"
+
 JavaTrieNodeProbabilities::usage = "Gives the corresponding Java trie with node frequencies converted\
  to probabilities."
 
@@ -202,6 +204,10 @@ Mathematica is (C) Copyright 1988-2017 Wolfram Research, Inc.
       TrieFunctions`merge[jTr, jTr2]
     ];
 
+Clear[JavaTrieNodeCounts]
+JavaTrieNodeCounts[jTr_?JavaObjectQ] :=
+    AssociationThread[{"total","internal","leaves"}->JLink`JavaObjectToExpression[TrieFunctions`nodeCounts[jTr]]];
+
 Clear[JavaTrieNodeProbabilities]
 JavaTrieNodeProbabilities[jTr_?JavaObjectQ] :=
     TrieFunctions`nodeProbabilities[jTr];