Is there any Checkstyle/PMD/Findbugs rule to force "else if" to be on the same line?

In our project for chained if/else/if we would like to have following formatting:

if (flag1) {
    // Do something 1
} else if (flag2) {
    // Do something 2
} else if (flag3) {
    // Do something 3
}

And forbid following one:

if (flag1) {
    // Do something 1
} else {
    if (flag2) {
        // Do something 2
    } else {
        if (flag3) {
            // Do something 3
        }
    }
}

Is there some predefined rule in either of listed above static code analysis tools to force this code style? If no - I know there is an ability to write custom rules in all of those tools, which one would you suggest to implement such a rule (not really familiar with writing custom rules in either of them)?