展平和展平HashMap的最佳方法

我想像本例一样将哈希图展平

nested := `{
  "one": {
    "two": [
      "2a",
      "2b"
    ]
  },
  "side": "value"
}`

// output: `{ "one.two.0": "2a", "one.two.1": "2b", "side": "value" 

不幸的是，我没有为此找到任何参考实现，因此我提出了如下所示的递归解决方案。是否有更好的方法（就不使用递归或性能，安全性或整洁性而言））？

public class Flat {

  public static void flatten(Map<String, ?> target, Map<String, String> result, String path) {
    for (var entry : target.entrySet()) {
      var next = path.equals("") ? entry.getKey() : path + "." + entry.getKey();
      if (entry.getValue() instanceof Map) {
        flatten((Map) entry.getValue(), result, next);
      } else {
        result.put(next, entry.getValue().toString());
      }
    }
  }

  public static Map unflatten(Map<String, String> target) {
    var result = new HashMap<String, Object>();
    for (var entry : target.entrySet()) {
      if (entry.getKey().split(".").length == 1) {
        result.put(entry.getKey(), entry.getValue());
      } else {
        var path = entry.getKey().split(".");
        Map<String, Object> current = new HashMap<>();
        for (var i = 0; i < path.length - 1; i++) {
          if (result.containsKey(path[i])) {
            current = (Map) (result.get(path[i]));
          } else {
            current = new HashMap<>();
            result.put(path[i], current);
          }
        }
        current.put(path[path.length - 1], entry.getValue());
      }
    }
    return result;
  }
}