asT<T> function

T asT<T>(Map<String, dynamic>? json, String key, { T? defaultValue, })

Implementation

T asT<T>(Map<String, dynamic>? json, String key, {T? defaultValue}) {
  if (json == null || !json.containsKey(key)) {
    if (defaultValue != null) return defaultValue;
    if (0 is T) return 0 as T;
    if (0.0 is T) return 0.0 as T;
    if ('' is T) return '' as T;
    if (false is T) return false as T;
    if ([] is T) return [] as T;
    if (<String, dynamic>{} is T) return <String, dynamic>{} as T;
    return '' as T;
  }
  dynamic value = json[key];
  if (value is T) return value;

  if (0 is T) {
    return toInt(value, defaultValue: (defaultValue ?? 0) as int) as T;
  } else if (0.0 is T) {
    return toDouble(value, defaultValue: (defaultValue ?? 0.0) as double) as T;
  } else if ('' is T) {
    return toString(value, defaultValue: (defaultValue ?? '') as String) as T;
  } else if (false is T) {
    return toBool(value, defaultValue: (defaultValue ?? false) as bool) as T;
  } else if ([] is T) {
    return toList(value, defaultValue: (defaultValue ?? []) as List) as T;
  } else if (<String, dynamic>{} is T) {
    Object defaultV = defaultValue ?? <String, dynamic>{};
    return toMap(value, defaultValue: defaultV as Map<String, dynamic>) as T;
  }
  return '' as T;
}