Let's say that I have a method declared in a Java ...

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[bloodshura]

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 !!...

[agrosner]

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

[evanchooly]

or response.content?.let { ... }

[michaelzinn]

or

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

if you want to keep the val’s name.

[michaelzinn]

Would

response.isOk and respone.content?.let { content -> {

work?

[marstran]

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.

[Paul Woitaschek]

Response.isOk is kind of obsolete right?

[Paul Woitaschek]

Why not just if(response.content != null) ... else ...?

[Paul Woitaschek]

Or if you don't have an else statement just response.content?.let {....}

[marstran]

I don't know which library this is from, but isOk might check for more than just response.content != null though.

[evanchooly]

isOk likely is an http response code check. things can be OK without a response body.

[karelpeeters]

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

[danneu]

had the same question yesterday in another channel 😛