validate method

@override bool validate(dynamic data)

Validates the provided data against this rule.

Returns true if the data is valid, false otherwise. Subclasses must implement this method.

Implementation

@override
bool validate(data) {
  if (data == null) return false;
  if (data is String) return data.isNotEmpty;
  if (data is List) return data.isNotEmpty;
  if (data is Map) return data.isNotEmpty;
  return true; // Any other non-null value is valid
}