Let's say that I have a method declared in a Java class, called

getContent()

, which returns a String? (it is annotated as

@Nullable

). However, in the same class, there is another method called

isOk()

, which returns a Boolean. If

isOk()

returns

true

, it means that the String returned by

getContent()

will not be null. Is there any way (like a JSR-305 annotation maybe) I can tell the Kotlin compiler about this? For now, I'm doing the obvious:

if (response.isOk) {
    val content = response.content!!
}

But I don't feel well at all having to use

!!

...

if (response.isOk) { val content = response.content ?: "" }

or

response.content?.let { ... }

or

response.content?.let { content -> ...

if you want to keep the val’s name.

You can do

response.takeIf { it.isOk }?.content?.let { content -> ... }

if you need to check

isOk

. But I think I would use the normal if-test, as most people would find it more readable.

Response.isOk is kind of obsolete right?

I don't know which library this is from, but

isOk

might check for more than just

response.content != null

though.

isOk

likely is an http response code check. things can be

OK

without a response body.

This issue asks about that: https://youtrack.jetbrains.com/issueMobile/KT-14397

had the same question yesterday in another channel 😛