Create Java 8 Stream from ArrayNode

Question

Is it possible to create stream from com.fasterxml.jackson.databind.node.ArrayNode?
I tried:

ArrayNode files = (ArrayNode) json.get(\"files\")         


        

Answer 1

An ArrayNode class provides random access: you can get size() and an element by index (using get(index)). This is all you need to create a good stream:

Stream nodes = IntStream.range(0, files.size()).mapToObj(files::get);

Note that this solution is better than using default spliterator (as suggested by other answerers) as it can split well and reports the size properly. Even if you don't care about parallel processing, some operations like toArray() will work more effectively as knowing the size in advance will help to allocate an array of proper size.