Renamed CodecHelper to UUIDCodecHelper and made it non-public

Author: jyemin

driver-core/src/main/com/mongodb/codecs/BinaryToUUIDTransformer.java

@@ -24,7 +24,7 @@
 
 import java.util.UUID;
 
-import static com.mongodb.codecs.CodecHelper.reverseByteArray;
+import static com.mongodb.codecs.UUIDCodecHelper.reverseByteArray;
 
 /**
  * A transformer from {@code BsonBinary} to {@code UUID}.

driver-core/src/main/com/mongodb/codecs/UUIDCodec.java

@@ -28,7 +28,7 @@
 
 import java.util.UUID;
 
-import static com.mongodb.codecs.CodecHelper.reverseByteArray;
+import static com.mongodb.codecs.UUIDCodecHelper.reverseByteArray;
 
 /**
  * Encodes and decodes {@code UUID} objects.

driver-core/src/main/com/mongodb/codecs/CodecHelper.java renamed to driver-core/src/main/com/mongodb/codecs/UUIDCodecHelper.java

@@ -18,14 +18,7 @@
 
 package com.mongodb.codecs;
 
-/**
- * helper functions for codecs
- */
-public final class CodecHelper {
-
-    private CodecHelper() {
-
-    }
+final class UUIDCodecHelper {
     // reverse elements in the subarray data[start:start+length]
     public static void reverseByteArray(final byte[] data, final int start, final int length) {
         for (int left = start, right = start + length - 1; left < right; left++, right--) {
@@ -35,4 +28,7 @@ public static void reverseByteArray(final byte[] data, final int start, final in
             data[right] = temp;
         }
     }
+
+    private UUIDCodecHelper() {
+    }
 }