Given you have a domain model with a simple parent / child relationship, and each entity has it s own associated DAO, eg:
Author
AuthorDAO
Book
BookDAO
If I want to add a DAO method for retrieving the books by a specific author, what s the best place for it?
class AuthorDAO
{
List<Book> getBooks(Author author);
}
or
class BookDAO
{
List<Book> getBooks(Author author)
}
I d place a Book finder on the BookDAO. This is where I would expect it to be, regardless of its parameters. If you want to find a book, you don t want to scan all DAOs to find where the right finder is. Putting it somewhere else won t help the users of the API.
The BookDAO, because you want to get information about books. The Book is the main subject here.
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