[Pojomatic-users] Pojomatic.diff()

[Ian R. <ian...@gm...>]

Chris Hansen wrote:

I am in the process of writing
org.pojomatic.junit.Assert.assertEqualsWithDiff() (similarly for
org.pojomatic.testng.Assert), what do you think of the name? Using
Pojomatic.diff(), I found it frustrating from an end-user standpoint that
null is not allowed as the first argument, which means every call has to
make the annoying check first. I understand why that is the case, but I
think it would be better to add behavior to Pojomatic.diff(null, x) to
return something like the opposite of DifferenceToNull: "{null} is different
than the object {x}". It would mean that Pojomatic.diff() has different
behavior than PojomatorImpl.diff(), but the API would be much easier to use.
Also, we could lift the non-null restriction from PojomatorImpl.diff() as
well. What do you think?

-Chris

I think this makes a lot of sense.  In particular, while the intended use of
doEquals, doHashCode and doToString is to have them called from an instance
of T, doDiff will typically be called by an external object, passing two
instances in.  Since doesn't change any method signatures, and doesn't
reduce functionality, I see no harm in making this change.

 - Ian