content: /*
   * Copyright 2020 Aiven Oy
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package io.aiven.kafka.connect.transforms.utils;
  
  public class Hex {
      private static final char[] HEX_ARRAY = "0123456789abcdef".toCharArray();
  
      /**
       * Encodes a byte array as a hexadecimal string.
       * @implNote https://stackoverflow.com/a/9855338/1781549
       */
      public static String encode(final byte[] bytes) {
          final char[] hexChars = new char[bytes.length * 2];
          for (int j = 0; j < bytes.length; j++) {
              final int v = bytes[j] & 0xFF;
              hexChars[j * 2] = HEX_ARRAY[v >>> 4]; // hi nibble
              hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F]; // lo nibble
          }
          return new String(hexChars);
      }
  }
  