package com.sinata.appointment.util;
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/** 列表等场景手机号脱敏：保留前 3、后 4，中间 * */
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public final class MobileMaskUtil {
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private MobileMaskUtil() {}
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public static String mask(String mobile) {
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if (mobile == null || mobile.isBlank()) {
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return "—";
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}
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String t = mobile.trim();
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int n = t.length();
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if (n <= 7) {
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return n <= 3 ? "***" : t.substring(0, Math.min(3, n)) + "*".repeat(Math.max(1, n - 3));
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}
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return t.substring(0, 3) + "*".repeat(n - 7) + t.substring(n - 4);
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}
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}
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