How to fetch the previous version of an asset(if available) programmatically within a Workflow Process?

Hi All,

I'm using AEM 6.4 and under a use case, I need to check the current version of an asset and then fetch the previous version of an asset?

Basically, I have to address the following items:-

• View what version of the asset you are using programmatically in the WorkflowProcess.
• Get byte[] for the previous version if exists. (*I can get bytes[] once I get the previous version)
• Restore the asset to a previous version.

Has anyone achieved this or something similar?

-thanks