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POPattern to transform objects
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copied!<p>I am looking for some best practices/patterns to transform objects from one to another. I load the data from DB using DAO to create my domain objects. In my application I need to transform into a different object that acts as an input to another module. For example, the customer is the domain object which holds a list of orders. I need to transform this into a object customerorder.</p> <pre><code>Public class Customer { String customerid List<Order> orders } Public class Order { Integer id Date orderDate } /** Transformed objects **/ public class CustomerOrder { string customerid Integer orderid } </code></pre> <p>Currently I have an interface CustomerDTO which has a method to return a list of CustomerOrder objects and a concrete class implementing the interface</p> <pre><code>Public interface CustomerDTO { List<CustomerOrder> getData(Date date) } Public class CustomerDTOImpl implements CustomerDTO { Private Customer customer Public CustomerDTOImpl(Customer customer) { this.customer = customer } Public List<CustomerOrder> getData(Date date) { ..... Code to loop through orders and create and return a list with matching order dates } } </code></pre> <p>For simple, transformations I don't need a DTO class but my transdormations are very complex and I would like to keep the transformation logic separate for different objects. Initially I had a transformer class which just loops through all the objects and create transformed objects but I don't think that was a good design and thought of this DTO. But I believe there are better ways to do it.</p> <p>Also I need to be able to use the DTO pattern on several objects. In this Customer was just one such object? I have 20 like diffent objects that I need to transform into their respective transformed objects.</p> <p>Any thoughts on best practices and pattern would be very useful. Also is there any generics I could use to scale them better.</p> <p>Thanks Javid</p>

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