getPath<E> method

E? getPath<E>(String k0, [ Object? k1, Object? k2, Object? k3, Object? k4, ])

Returns the final value from a path of keys as E. If not null, it attempts to parse the value into E or throws a StateError.

Implementation

E? getPath<E>(String k0, [Object? k1, Object? k2, Object? k3, Object? k4]) {
  Object key = k0;
  Object? val = get(k0);
  if (val == null) return null;

  if (k1 != null) {
    key = k1;
    val = val is Map ? val[k1] : (k1 is int && val is List ? val[k1] : null);
    if (val == null) return null;
  }

  if (k2 != null) {
    key = k2;
    val = val is Map ? val[k2] : (k2 is int && val is List ? val[k2] : null);
    if (val == null) return null;
  }

  if (k3 != null) {
    key = k3;
    val = val is Map ? val[k3] : (k3 is int && val is List ? val[k3] : null);
    if (val == null) return null;
  }

  if (k4 != null) {
    key = k4;
    val = val is Map ? val[k4] : (k4 is int && val is List ? val[k4] : null);
    if (val == null) return null;
  }

  val = _resolveValue(key.toString(), val, null);

  if (val is! E) {
    var val2 = _parseValue<E>(val);
    if (val2 != null) return val2;

    var keyPath = [k0, k1, k2, k3, k4].whereNotNull().join('/');
    throw StateError("Can't return key `$keyPath` as `$E`: $val");
  }

  return val;
}