from static method
Implementation
static JSONPaging? from(Object? json) {
if (json == null) return null;
_registerPagingFormats();
if (json is JSONPaging) return json;
for (var entry in _pagingFormats.entries) {
var matcher = entry.key;
if (matcher(json)) {
var instantiator = entry.value;
return instantiator(json);
}
}
return null;
}