absurdfarce commented on code in PR #2013:
URL:
https://github.com/apache/cassandra-java-driver/pull/2013#discussion_r2127402217
##########
core/src/main/java/com/datastax/oss/driver/internal/core/addresstranslation/Subnet.java:
##########
@@ -0,0 +1,157 @@
+package com.datastax.oss.driver.internal.core.addresstranslation;
+
+import
com.datastax.oss.driver.shaded.guava.common.annotations.VisibleForTesting;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.Arrays;
+
+class Subnet {
+ private final byte[] subnet;
+ private final byte[] networkMask;
+ private final byte[] upper;
+ private final byte[] lower;
+
+ private Subnet(byte[] subnet, byte[] networkMask) {
+ this.subnet = subnet;
+ this.networkMask = networkMask;
+
+ byte[] upper = new byte[subnet.length];
+ byte[] lower = new byte[subnet.length];
+ for (int i = 0; i < subnet.length; i++) {
+ upper[i] = (byte) (subnet[i] | ~networkMask[i]);
+ lower[i] = (byte) (subnet[i] & networkMask[i]);
+ }
+ this.upper = upper;
+ this.lower = lower;
+ }
+
+ static Subnet parse(String subnetCIDR) throws UnknownHostException {
+ String[] parts = subnetCIDR.split("/");
Review Comment:
ErrorProne complains about this line when building due to [known issues with
String.split()](https://errorprone.info/bugpattern/StringSplitter).
Recommendation is to replace this with:
```java
List<String> parts = Splitter.on('/').splitToList(subnetCIDR);
```
I used something slightly different to preserve the `String[]` type
throughout the rest of the code and it seemed to work fine:
```java
String[] parts = Iterables.toArray(Splitter.on('/').split(subnetCIDR),
String.class);
```
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