toJson method

@override Map<String, dynamic> toJson()

Converts the object to a JSON representation.

Implementation

@override
Map<String, dynamic> toJson() {
  final json = <String, dynamic>{};
  bool isNonEmpty(dynamic val) {
    if (val == null) return false;
    if (val is List && val.isEmpty) return false;
    if (val is Map && val.isEmpty) return false;
    return true;
  }

  void addField(String key, dynamic field) {
    if (field == null) return;
    if (!(field is FhirBase? || field is List<FhirBase>?)) {
      throw ArgumentError('"field" must be a FhirBase type');
    }
    if (field is PrimitiveType) {
      final fieldMap = field.toJson();
      final val = fieldMap['value'];
      final ext = fieldMap['_value'];
      final hasVal = isNonEmpty(val);
      final hasExt = isNonEmpty(ext);
      if (hasVal) json[key] = val;
      if (hasExt) json['_$key'] = ext;
    } else if (field is List<FhirBase>) {
      if (field.isEmpty) return;
      final isPrimitive = field.first is PrimitiveType;
      final tempList = <dynamic>[];
      final tempExtensions = <dynamic>[];
      for (final e in field) {
        final itemMap = e.toJson();
        if (!isNonEmpty(itemMap)) {
          continue;
        }
        if (isPrimitive) {
          final v = itemMap['value'];
          final x = itemMap['_value'];
          tempList.add(v);
          tempExtensions.add(x);
        } else {
          tempList.add(itemMap);
        }
      }
      if (tempList.isEmpty) return;
      if (isPrimitive) {
        final hasAnyValues = tempList.any((v) => v != null);
        if (hasAnyValues) {
          json[key] = tempList;
        }
        final anyExt = tempExtensions.any(isNonEmpty);
        if (anyExt) {
          json['_$key'] = tempExtensions;
        }
      } else {
        json[key] = tempList;
      }
    } else if (field is FhirBase) {
      final subMap = field.toJson();
      if (isNonEmpty(subMap)) {
        json[key] = subMap;
      }
    }
  }

  addField(
    'id',
    id,
  );
  addField(
    'extension',
    extension_,
  );
  addField(
    'modifierExtension',
    modifierExtension,
  );
  addField(
    'type',
    type,
  );
  addField(
    'value',
    value,
  );
  addField(
    'baseCitation',
    baseCitation,
  );
  return json;
}