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Alex Rivera
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I want to validate my domain objects before I pass them on to a other part of the system. All the objects that I want to validate share the same interface. The problem is that I can't figure out how to write this in a good way. I don't want to move the validation inside my value object. But I don't want to be forced to do a instanceOf-check either. An example: public interface Vehicle {} public class Car implements Vehicle {} public class MotorBike implements Vehicle {} public interface VehicleValidator { void validate(); } public class CarValidator implements VehicleValidator { @Override public void validate() {} } public class MotorBikeValidator implements VehicleValidator { @Override public void validate() {} } public void process(Vehicle vehicle) { //TODO: validate vehicle doSomething(vehicle); } In Scala I would have done something similar to http://debasishg.blogspot.se/2010/06/scala-implicits-type-classes-here-i.html But those language constructs is not possible in Java.
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