Conditional Mapping Framework in Java

Question

My requirement was to map one Java Object to another. But this was conditional mapping as follows

// Create Y from data in X // If X has a=A and b=B then set p=P in Y else set p=P' // If X has c that starts with "CC" then set q=Q in Y else set q=Q' // so on

I explored Dozer & MapStruct, but did not find them apt for supporting above conditions without polluting code with lot of annotations.

Is there any library that cleanly abstracts out such conditional mappings or rules. I mean, some framework that executes rules in a sequence and finally ends up creating Y from X

// Here ChainOfTransformers may be configuration driven transformation logic ExpectedLibrary.map(SourceEntity, DestinationEntity, ChainOfTransformers)

Please point me to open source units that I can explore

Since the logic you obviously do have seems to be quite complicated, why not take the generated output of e.g. MapStruct and enrich it with your own logic? — Dominik Sandjaja
– Dominik Sandjaja, Commented May 4, 2016 at 19:08

Gunnar · Accepted Answer · 2016-05-10 08:23:19Z

When using MapStruct, you might take a look at decorators and after-mapping callbacks. Both allow you to perform additional mapping logic from hand.

Personally I think you are better of by implementing these routines using plain Java code instead of some kind of "configured rules".

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