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This is a pure Java library for the generation of DCE 1.1, ISO/IEC 11578:1996 and IETF RFC-4122 compliant Universally Unique Identifier (UUID). It supports DCE 1.1 variant UUIDs of version 1 (time and node based), version 3 (name based, MD5), version 4 (random number based) and version 5 (name based, SHA-1). The library is part of the graphqlio ecosystem.

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/**
 * *****************************************************************************
 *
 * Design and Development by msg Applied Technology Research Copyright (c) 2019-2020 msg systems
 * ag (http://www.msg-systems.com/) All Rights Reserved.
 *
 * 
Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * 
The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * ****************************************************************************
 */
package com.graphqlio.uuid.domain;

/**
 * GlobaleConstants providing constants.
 *
 * @author Michael Schüfer
 * @author Ahmed Amedlous
 * @author Dr. Edgar Müller
 */
public final class GlobaleConstants {

  /* UI64 constants */
  public static final long UI64_DIGITS = 8; /* number of digits */
  public static final long UI64_DIGIT_BITS = 8; /* number of bits in a digit */
  public static final long UI64_DIGIT_BASE = 256; /* the numerical base of a digit */

  public static final int TIME_TO_100_NSEC = 10000; // 1000 * 10

  public static final long[] TAB_0 = {0, 0, 0, 0, 0, 0, 0, 0};

  public static final long[] MUL_TAB = {0x58, 0x51, 0xf4, 0x2d, 0x4c, 0x95, 0x7f, 0x2d};
  public static final long[] INC_TAB = {0x14, 0x05, 0x7b, 0x7e, 0xf7, 0x67, 0x81, 0x4f};
  public static final long[] MASK_TAB = {0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff};

  public static final int OUTPUT_18 = 18;
  public static final int OUTPUT_27 = 27;
  public static final int OUTPUT_59 = 59;

  public static final long[] UNIX_EPOCH_TIME_TAB = {0x01, 0xB2, 0x1D, 0xD2, 0x13, 0x81, 0x40, 0x00};

  public static final String[] OPTIONS = {"8", "8", "true"};

  public static final String IBITS = "ibits";
  public static final String OBITS = "obits";
  public static final String OBIGENDIAN = "obigendian";
  public static final String IBIGENDIAN = "ibigendian";

  public static long[] Z85_DECODER = {
    0x00, 0x44, 0x00, 0x54, 0x53, 0x52, 0x48, 0x00, 0x4B, 0x4C, 0x46, 0x41, 0x00, 0x3F, 0x3E, 0x45,
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x40, 0x00, 0x49, 0x42, 0x4A, 0x47,
    0x51, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32,
    0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x4D, 0x00, 0x4E, 0x43, 0x00,
    0x00, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
    0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x4F, 0x00, 0x50, 0x00, 0x00
  };

  /*
   * This library provides Z85: ZeroMQ's Base-85 encoding/decoding (see
   * http://rfc.zeromq.org/spec:32 for details)
   */

  public static final String[] Z85_ENCODER =
      "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-:+=^!/*?&<>()[]{}@%$#"
          .split("");

  public static final String SCAN_PACKAGE = "com.graphqlio.uuid";
  public static final String API = "/uuid";
  public static final String API_GENERATE_UUID = "generateUUID";
}