I am trying out Opensignal API and have run into a wall when trying to use Jackson 2.0 to serialize the result. The networkRank can be an array or it can be a string
How could I set Jackson to serialize JSON properly, like if it's a string, save it to this String networkRank attribute else save it to List <NetworkRank> = new ArrayList<NetworkRank>()
These are result of their api: (Check out networkRank below)
{
"apiVersion": "2",
"latitude": "14.55669",
"longitude": "121.370119",
"distance": "10",
"network_type": "10",
"perMinuteCurrent": 0,
"perMinuteLimit": 10,
"perMonthCurrent": 7,
"perMonthLimit": 2000,
"networkRank": "No results for this area"
}
and
{
"apiVersion": "2",
"latitude": "14.55669",
"longitude": "121.370119",
"distance": "10",
"network_type": "10",
"perMinuteCurrent": 0,
"perMinuteLimit": 10,
"perMonthCurrent": 7,
"perMonthLimit": 2000,
"networkRank": [
{
"networkName": "T-Mobile",
"networkId": "310260",
"type3G": {
"networkName": "T-Mobile",
"networkId": "310260",
"networkType": "3",
"averageRssiAsu": "10.934899",
"averageRssiDb": "-91.130203",
"sampleSizeRSSI": "437532",
"downloadSpeed": "4532.8305",
"uploadSpeed": "1124.9649",
"pingTime": "148.8205",
"reliability": "94.5944170771741"
},
"type4G": {
"networkName": "EE",
"networkId": "23430",
"networkType": "4",
"averageRsrpAsu": "33.865632",
"averageRsrpDb": "-106.134368",
"sampleSizeRSRP": "284041",
"downloadSpeed": "9851.1000",
"uploadSpeed": "4377.3200",
"pingTime": "87.0000",
"reliability": "96.2113095238094"
}
}
]
}
The simplest way to use a same field for either a json string or a array is probably to use a Object field. This solution do not need a custom serializer and deserializer. Following is an example class with Jackson annotation:
@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY)
public class NetworkStatistics {
private String apiVersion;
private String latitude;
private String longitude;
private String distance;
@JsonProperty("network_type")
private String networkType;
private int perMinuteCurrent;
private int perMinuteLimit;
private int perMonthCurrent;
private int perMonthLimit;
private Object networkRank;
public NetworkStatistics() {
}
// getters
}
Following is an example to deserialize a json string of the api response into NetworkStatistics instance:
ObjectMapper mapper = new ObjectMapper();
NetworkStatistics networkStatistics = mapper.readValue(json, NetworkStatistics.class);
and an example to serialize NetworkStatistics instance into json String:
String json = mapper.writeValueAsString(networkStatistics))
If networkRank in json is a string value, the instance field after deserialization will be a String field. If it is a json array, the instance field will be a java.util.ArrayList field.
Hope this can help.
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