Progressed on port from dotnet to java

java/exclusions/SamplingStringComparer.java

@@ -0,0 +1,48 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package com.azure.data.cosmos.serialization.hybridrow.layouts;
+
+public class SamplingStringComparer implements IEqualityComparer<String> {
+
+    public static final SamplingStringComparer Default = new SamplingStringComparer();
+
+    public final boolean equals(String x, String y) {
+        checkArgument(x != null);
+        checkArgument(y != null);
+
+        return x.equals(y);
+    }
+
+    public final int hashCode(String obj) {
+        checkArgument(obj != null);
+
+        // TODO: C# TO JAVA CONVERTER: There is no equivalent to an 'unchecked' block in Java:
+        unchecked
+        {
+            //C# TO JAVA CONVERTER WARNING: Unsigned integer types have no direct equivalent in Java:
+            //ORIGINAL LINE: uint hash1 = 5381;
+            int hash1 = 5381;
+            //C# TO JAVA CONVERTER WARNING: Unsigned integer types have no direct equivalent in Java:
+            //ORIGINAL LINE: uint hash2 = hash1;
+            int hash2 = hash1;
+            final int numSamples = 4;
+            final int modulus = 13;
+
+            ReadOnlySpan<Character> utf16 = obj.AsSpan();
+            int max = Math.min(utf16.Length, numSamples);
+            for (int i = 0; i < max; i++) {
+                //C# TO JAVA CONVERTER WARNING: Unsigned integer types have no direct equivalent in Java:
+                //ORIGINAL LINE: uint c = utf16[(i * modulus) % utf16.Length];
+                int c = utf16[(i * modulus) % utf16.Length];
+                if (i % 2 == 0) {
+                    hash1 = ((hash1 << 5) + hash1) ^ c;
+                } else {
+                    hash2 = ((hash2 << 5) + hash2) ^ c;
+                }
+            }
+
+            return hash1 + (hash2 * 1566083941);
+        }
+    }
+}