package jnpf.bizcommon.audit.service.support;
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import java.util.Locale;
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/** 为同名字段附加物理表作用域的可持久化复合键。 */
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public final class AuditDiffKey {
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private static final String SCOPED_PREFIX = "@table:";
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private AuditDiffKey() {
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}
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/**
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* 长度前缀让表名和字段名的边界无歧义，同时只使用 PostgreSQL JSONB 可接受的可打印字符。
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*/
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public static String of(String targetTable, String field) {
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String normalizedField = normalize(field);
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String normalizedTable = normalize(targetTable);
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if (normalizedTable == null) {
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return normalizedField == null ? "" : normalizedField;
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}
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String effectiveField = normalizedField == null ? "" : normalizedField;
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return SCOPED_PREFIX + normalizedTable.length() + ":" + normalizedTable + ":" + effectiveField;
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}
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public static boolean isScoped(String key) {
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if (key == null || !key.startsWith(SCOPED_PREFIX)) {
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return false;
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}
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int lengthEnd = key.indexOf(':', SCOPED_PREFIX.length());
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if (lengthEnd < 0) {
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return false;
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}
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try {
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int tableLength = Integer.parseInt(key.substring(SCOPED_PREFIX.length(), lengthEnd));
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long fieldSeparator = (long) lengthEnd + 1L + tableLength;
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return tableLength >= 0 && fieldSeparator < key.length()
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&& key.charAt((int) fieldSeparator) == ':';
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} catch (NumberFormatException ignored) {
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return false;
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}
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}
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/** 只用于兼容已加载到内存的旧键；返回值不会再携带旧 NUL 分隔符。 */
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public static String normalizeStored(String key) {
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if (key == null) {
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return null;
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}
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int separator = key.indexOf(Character.MIN_VALUE);
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if (separator < 0) {
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return key;
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}
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return of(key.substring(0, separator), key.substring(separator + 1));
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}
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private static String normalize(String value) {
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if (value == null) {
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return null;
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}
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String normalized = value.trim().toLowerCase(Locale.ROOT);
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return normalized.isEmpty() ? null : normalized;
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}
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}
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