bug5627: introduced IPAddressUtil plus test to shorten replica look-up

2026-09-22 21:55:39 +00:00 · 2023-01-03 18:07:52 +01:00
parent 92bb477cea
commit 141af431f6
3 changed files with 67 additions and 1 deletions
@@ -0,0 +1,34 @@
+package com.sap.sse.util;
+
+import java.util.regex.Pattern;
+
+/**
+ * Helps identifying IPv4 and IPv6 address literals, using regular expressions.
+ * <p>
+ * 
+ * This can be helpful when trying to tell whether a host address is provided as
+ * a symbolic hostname that requires DNS resolution, or as an address literal that
+ * can directly be used.
+ * 
+ * @author Axel Uhl (d043530)
+ *
+ */
+public class IPAddressUtil {
+    private static final Pattern ipv4Pattern = Pattern.compile("[1-9][0-9]{0,2}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}");
+    private static final Pattern ipv6Pattern = Pattern.compile("(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))");
+    
+    public static boolean isIPv4AddressLiteral(String address) {
+        return ipv4Pattern.matcher(address).matches();
+    }
+
+    public static boolean isIPv6AddressLiteral(String address) {
+        return ipv6Pattern.matcher(address).matches();
+    }
+    
+    /**
+     * Tells if {@code address} is an IPv4 or IPv6 address literal.
+     */
+    public static boolean isIPAddressLiteral(String address) {
+        return isIPv4AddressLiteral(address) || isIPv6AddressLiteral(address);
+    }
+}