Code clean up for UUIDConverter

Author: artembilan

spring-integration-core/src/main/java/org/springframework/integration/util/UUIDConverter.java

@@ -32,18 +32,19 @@
  * @author Dave Syer
  * @author Gary Russell
  * @author Christian Tzolov
+ * @author Artem Bilan
  */
 public class UUIDConverter implements Converter<Object, UUID> {
 
 	/**
-	 * @deprecated since 6.0.8 as it is not used internally by the UUIDConverter. The internal implementation relies, now,
-	 * on StandardCharsets.UTF_8 instead.
+	 * @deprecated since 6.0.8 as it is not used internally by the UUIDConverter.
+	 * The internal implementation relies on {@link StandardCharsets#UTF_8} instead.
 	 */
 	@Deprecated
 	public static final String DEFAULT_CHARSET = "UTF-8";
 
-	private static final Pattern UUID_REGEX = Pattern
-			.compile("^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$");
+	private static final Pattern UUID_REGEX =
+			Pattern.compile("^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$");
 
 	/**
 	 * Convert the input to a UUID using the convenience method {@link #getUUID(Object)}.
@@ -75,22 +76,25 @@ public static UUID getUUID(Object input) {
 		if (input instanceof UUID) {
 			return (UUID) input;
 		}
-		if (input instanceof String) {
-			String inputText = (String) input;
+		if (input instanceof String inputText) {
 			if (isValidUuidStringRepresentation(inputText)) {
 				return UUID.fromString(inputText);
 			}
 			else {
-				return UUID.nameUUIDFromBytes((inputText).getBytes(StandardCharsets.UTF_8));
+				return fromStringBytes(inputText);
 			}
 		}
 		if (ClassUtils.isPrimitiveOrWrapper(input.getClass())) {
-			return UUID.nameUUIDFromBytes(input.toString().getBytes(StandardCharsets.UTF_8));
+			return fromStringBytes(input.toString());
 		}
 		byte[] bytes = serialize(input);
 		return UUID.nameUUIDFromBytes(bytes);
 	}
 
+	private static UUID fromStringBytes(String input) {
+		return UUID.nameUUIDFromBytes(input.getBytes(StandardCharsets.UTF_8));
+	}
+
 	private static byte[] serialize(Object object) {
 		if (object == null) {
 			return null;
@@ -99,8 +103,8 @@ private static byte[] serialize(Object object) {
 		try {
 			new ObjectOutputStream(stream).writeObject(object);
 		}
-		catch (IOException e) {
-			throw new IllegalArgumentException("Could not serialize object of type: " + object.getClass(), e);
+		catch (IOException ex) {
+			throw new IllegalArgumentException("Could not serialize object of type: " + object.getClass(), ex);
 		}
 		return stream.toByteArray();
 	}