what is the best way to implement a mapper in java?

Question

I have three request objects called Request1To,Request2To,Request3To. I want to have a method that takes in any of these TO's and return a response object. I have currently implemented like this

class Mapper{
     public ResponseTo mapRequest1(Request1To){

      }

     public ResponseTo mapRequest2(Request2To){

      }

    public ResponseTo mapRequest3(Request3To){

      }

}

Is there a better way to do this instead of creating a seperate method for each request object?

Solution

Take a look at Dozer and modelmapper. They are both excellent tools for mapping one object to another. I know that Dozer integrates with Spring. In Dozer your code will look something like this:

Mapper mapper = new DozerBeanMapper();
ResponseTo response = mapper.map(request, ResponseTo.class);

It's very powerful and very easy to use.

Comments

[mohanaki]

mapping for each request object is different.I need to have an if condition inside the mapRequest method to find what the instance type is and then do mapping which i dont like.

[mohanaki]

i dont want to have chained if conditions.

[someone]

I changed my Answer check it

[mohanaki]

I need to have the mapping logic in transferobject which i don't want to do.As having mapping logic in transfer object ties it to a particular response type.