WindowSpec.fromJson constructor

WindowSpec.fromJson(Object? json_)

Returns a new instance from a JSON value. May throw if the value does not have the expected structure.

Implementation

factory WindowSpec.fromJson(Object? json_) {
  final json = json_ is Map
      ? _spec.fields.map((f) => json_[f.label]).toList(growable: false)
      : json_;
  return switch (json) {
    [final partitionBy, final orderBy, final windowFrame] ||
    (final partitionBy, final orderBy, final windowFrame) =>
      WindowSpec(
        partitionBy: (partitionBy! as Iterable).map(Expr.fromJson).toList(),
        orderBy: (orderBy! as Iterable).map(OrderByExpr.fromJson).toList(),
        windowFrame:
            Option.fromJson(windowFrame, (some) => WindowFrame.fromJson(some))
                .value,
      ),
    _ => throw Exception('Invalid JSON $json_')
  };
}