如何从Java的ExecutionResult中提取集合？

Question

Given the following query:

CREATE (versionNode:Version {previousVersions: [4,3,2,1]}) 
RETURN versionNode.previousVersions AS versions

how can I end up with a Collection<Long> from an ExecutionResult ? AFAIK, the Node#getProperty() method can only return primitive types, so I cannot use that. Is it possible?

Answer 1

I found a solution. This code made me realize it:

String cypher = "CREATE (versionNode:Version {previousVersions: [4,3,2,1]}) " +
                "RETURN versionNode.previousVersions AS versions";
ExecutionResult result = new ExecutionEngine(db).execute(cypher);
System.out.println(result.iterator().next().get("versions").getClass());

this outputted the strange symbol:

class [J

According to the Java docs for Class#getName() it means the type of the object returned is a primitive long array.

So now I can do this and get my numbers returned into a collection:

Collection<Long> versionsCollection = new ArrayList<>();
long[] versions = (long[]) result.iterator().next().get("versions");
for (long v : versions) {
  versionsCollection.add(v);
}