content: /*
   ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
   ~                                                                               ~
   ~ The MIT License (MIT)                                                         ~
   ~                                                                               ~
   ~ Copyright (c) 2015-2025 miaixz.org and other contributors.                    ~
   ~                                                                               ~
   ~ 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 org.miaixz.bus.core.net;
  
  import java.util.HashMap;
  
  import org.miaixz.bus.core.center.map.BiMap;
  import org.miaixz.bus.core.lang.Assert;
  import org.miaixz.bus.core.net.ip.IPv4;
  
  /**
   * 掩码位和掩码之间的Map对应
   *
   * @author Kimi Liu
   * @since Java 17+
   */
  public class MaskBit {
  
      /**
       * 掩码位与掩码的点分十进制的双向对应关系
       */
      private static final BiMap<Integer, String> MASK_BIT_MAP;
  
      static {
          MASK_BIT_MAP = new BiMap<>(new HashMap<>(32));
          MASK_BIT_MAP.put(1, "128.0.0.0");
          MASK_BIT_MAP.put(2, "192.0.0.0");
          MASK_BIT_MAP.put(3, "224.0.0.0");
          MASK_BIT_MAP.put(4, "240.0.0.0");
          MASK_BIT_MAP.put(5, "248.0.0.0");
          MASK_BIT_MAP.put(6, "252.0.0.0");
          MASK_BIT_MAP.put(7, "254.0.0.0");
          MASK_BIT_MAP.put(8, "255.0.0.0");
          MASK_BIT_MAP.put(9, "255.128.0.0");
          MASK_BIT_MAP.put(10, "255.192.0.0");
          MASK_BIT_MAP.put(11, "255.224.0.0");
          MASK_BIT_MAP.put(12, "255.240.0.0");
          MASK_BIT_MAP.put(13, "255.248.0.0");
          MASK_BIT_MAP.put(14, "255.252.0.0");
          MASK_BIT_MAP.put(15, "255.254.0.0");
          MASK_BIT_MAP.put(16, "255.255.0.0");
          MASK_BIT_MAP.put(17, "255.255.128.0");
          MASK_BIT_MAP.put(18, "255.255.192.0");
          MASK_BIT_MAP.put(19, "255.255.224.0");
          MASK_BIT_MAP.put(20, "255.255.240.0");
          MASK_BIT_MAP.put(21, "255.255.248.0");
          MASK_BIT_MAP.put(22, "255.255.252.0");
          MASK_BIT_MAP.put(23, "255.255.254.0");
          MASK_BIT_MAP.put(24, "255.255.255.0");
          MASK_BIT_MAP.put(25, "255.255.255.128");
          MASK_BIT_MAP.put(26, "255.255.255.192");
          MASK_BIT_MAP.put(27, "255.255.255.224");
          MASK_BIT_MAP.put(28, "255.255.255.240");
          MASK_BIT_MAP.put(29, "255.255.255.248");
          MASK_BIT_MAP.put(30, "255.255.255.252");
          MASK_BIT_MAP.put(31, "255.255.255.254");
          MASK_BIT_MAP.put(32, "255.255.255.255");
      }
  
      /**
       * 根据掩码位获取掩码
       *
       * @param maskBit 掩码位
       * @return 掩码
       */
      public static String get(final int maskBit) {
          return MASK_BIT_MAP.get(maskBit);
      }
  
      /**
       * 根据掩码获取掩码位
       *
       * @param mask 掩码的点分十进制表示，如 255.255.255.0
       * @return 掩码位，如 24；如果掩码不合法，则返回null
       */
      public static Integer getMaskBit(final String mask) {
          return MASK_BIT_MAP.getKey(mask);
      }
  
      /**
       * 根据掩码位获取掩码IP(Long型)
       *
       * @param maskBit 掩码位
       * @return 掩码IP(Long型)
       */
      public static long getMaskIpLong(final int maskBit) {
          Assert.isTrue(MASK_BIT_MAP.containsKey(maskBit), "非法的掩码位数：{}", maskBit);
          return (Protocol.IPV4_NUM_MAX << (IPv4.IPV4_MASK_BIT_MAX - maskBit)) & Protocol.IPV4_NUM_MAX;
      }
  
  }
  