zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/utility/IdHashes.java [39:71]:
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  private static String encode(Long value) {

    List<Character> result = new ArrayList<>();
    BigInteger base = new BigInteger("" + DICTIONARY.length);
    int exponent = 1;
    BigInteger remaining = new BigInteger(value.toString());
    while (true) {
      BigInteger a = base.pow(exponent); // 16^1 = 16
      BigInteger b = remaining.mod(a); // 119 % 16 = 7 | 112 % 256 = 112
      BigInteger c = base.pow(exponent - 1);
      BigInteger d = b.divide(c);

      // if d > dictionary.length, we have a problem. but BigInteger doesnt have
      // a greater than method :-( hope for the best. theoretically, d is always
      // an index of the dictionary!
      result.add(DICTIONARY[d.intValue()]);
      remaining = remaining.subtract(b); // 119 - 7 = 112 | 112 - 112 = 0

      // finished?
      if (remaining.equals(BigInteger.ZERO)) {
        break;
      }

      exponent++;
    }

    // need to reverse it, since the start of the list contains the least significant values
    StringBuffer sb = new StringBuffer();
    for (int i = result.size() - 1; i >= 0; i--) {
      sb.append(result.get(i));
    }
    return sb.toString();
  }
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zeppelin-interpreter/src/main/java/org/apache/zeppelin/util/IdHashes.java [39:71]:
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  private static String encode(Long value) {

    List<Character> result = new ArrayList<>();
    BigInteger base = new BigInteger("" + DICTIONARY.length);
    int exponent = 1;
    BigInteger remaining = new BigInteger(value.toString());
    while (true) {
      BigInteger a = base.pow(exponent); // 16^1 = 16
      BigInteger b = remaining.mod(a); // 119 % 16 = 7 | 112 % 256 = 112
      BigInteger c = base.pow(exponent - 1);
      BigInteger d = b.divide(c);

      // if d > dictionary.length, we have a problem. but BigInteger doesnt have
      // a greater than method :-( hope for the best. theoretically, d is always
      // an index of the dictionary!
      result.add(DICTIONARY[d.intValue()]);
      remaining = remaining.subtract(b); // 119 - 7 = 112 | 112 - 112 = 0

      // finished?
      if (remaining.equals(BigInteger.ZERO)) {
        break;
      }

      exponent++;
    }

    // need to reverse it, since the start of the list contains the least significant values
    StringBuffer sb = new StringBuffer();
    for (int i = result.size() - 1; i >= 0; i--) {
      sb.append(result.get(i));
    }
    return sb.toString();
  }
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