I'm starting to play with Domain Driven Design and have a question about ValueObjects :
Can they contains invariants or other specifications ?
Consider an immutable ValueObject :
ValueObject (
prop integer: Int
prop string: String
// Value and copy constructor
// Observers for integer and string
// Equality methods on integer and string value
)
Can I add some invariants such that integer > 0 & < 42. Or do they have to be simple transfer without any logic ?
I hope they can but need a confirmation.
A value object (VO) encapsulates a value and its business requirements . This is its purpose: to model a business concept (with its constraints) which happens to be a simple (not always single) value.
A VO is not a Data transfer object (DTO) precisely because it defines a business concept that is valid only in the containing bounded context, while a DTO is meant to cross boundaries.
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