cn.hutool.core.net.MaskBit Maven / Gradle / Ivy

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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.core.net;

import cn.hutool.core.map.BiMap;
import java.util.HashMap;

/**
 * 掩码位和掩码之间的Map对应
 *
 * @since 5.4.1
 * @author looly
 */
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 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(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
	 * @since 5.6.5
	 */
	public static Integer getMaskBit(String mask) {
		return MASK_BIT_MAP.getKey(mask);
	}

}