RFR: 8282917: Remove InetAddressImplFactory from InetAddress [v3]

[Aleksei Efimov]

On Wed, 16 Mar 2022 14:34:49 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> I agree that it could be simplified to match `Java_java_net_InetAddress_isIPv4Available`. Changed in 49fdd576cade2e97639f827f9db6d0f1e31101e2
>
> Thanks for noticing that Jaikiran!
> 
> Both `ipv4_available()` and `ipv6_available()` are defined to return `jint` so the implementation in `Java_java_net_InetAddress_isIPv6Supported` is arguably the more correct (provided that the method being called returns 0 when the corresponding IP version is not available).
> 
> The signature in the comment should be changed as you suggest though.
> 
> Possibly we should consider having both methods use the same construct...

Current version should be ok since variables returned by `ipv4_available()` and `ipv6_available()` can only be initialized to `JNI_FALSE` or `JNI_TRUE`:
- `Java_java_net_InetAddress_isIPv4Available`[InetAddress.c] returns result of `ipv4_available`[net_util.c]
- `ipv4_available`[net_util.c] returns `IPv4_available` variable value
- `IPv4_available` value is initalized with a result returned by `IPv4_supported()`[net_util_md.c]
- `IPv4_supported()`[net_util_md.c] can return `JNI_TRUE` or `JNI_FALSE` only (in both Unix and Windows implementations)
-  Same stands true for `ipv6_available()`: only `JNI_TRUE` or `JNI_FALSE` can be returned

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PR: https://git.openjdk.java.net/jdk/pull/7842