How to generate a hierarchy based data from flat data in cap java using TopLevels in OData

[Irbaaz]

Hello there,

I am new in SAP CAP Java, i am looking for transforming a flat table data into a hierarchy based data using OData.

Let's take an example, let's assume this is the flat table data:

and  response should be:

I have created response exactly like the above response by customized tree based on the values from the flat table data. I want to implement this by using 'com.sap.vocabularies.Hierarchy.v1.TopLevels'. I don't see any blogs ,Tutorials about this. do we have anything like that? or is it possible to do it?, Can anyone help me out? 

Thanks in advance!
Irbaaz

[VladimirM1]

Check Capire ​​https://cap.cloud.sap/docs/advanced/odata#hierarchical-transformations and our sample application https://github.com/SAP-samples/cloud-cap-samples-java where we have a working demo of the hierarchical data.