protected Object _unwrapAndDeserialize(
JsonParser jp, DeserializationContext ctxt, JavaType rootType, JsonDeserializer<Object> deser)
throws IOException, JsonParseException, JsonMappingException {
SerializedString rootName = _provider.findExpectedRootName(ctxt.getConfig(), rootType);
if (jp.getCurrentToken() != JsonToken.START_OBJECT) {
throw JsonMappingException.from(
jp,
"Current token not START_OBJECT (needed to unwrap root name '"
+ rootName
+ "'), but "
+ jp.getCurrentToken());
}
if (jp.nextToken() != JsonToken.FIELD_NAME) {
throw JsonMappingException.from(
jp,
"Current token not FIELD_NAME (to contain expected root name '"
+ rootName
+ "'), but "
+ jp.getCurrentToken());
}
String actualName = jp.getCurrentName();
if (!rootName.getValue().equals(actualName)) {
throw JsonMappingException.from(
jp,
"Root name '"
+ actualName
+ "' does not match expected ('"
+ rootName
+ "') for type "
+ rootType);
}
// ok, then move to value itself....
jp.nextToken();
Object result;
if (_valueToUpdate == null) {
result = deser.deserialize(jp, ctxt);
} else {
deser.deserialize(jp, ctxt, _valueToUpdate);
result = _valueToUpdate;
}
// and last, verify that we now get matching END_OBJECT
if (jp.nextToken() != JsonToken.END_OBJECT) {
throw JsonMappingException.from(
jp,
"Current token not END_OBJECT (to match wrapper object with root name '"
+ rootName
+ "'), but "
+ jp.getCurrentToken());
}
return result;
}
/** Method called to locate deserializer for the passed root-level value. */
protected JsonDeserializer<Object> _findRootDeserializer(
DeserializationConfig cfg, JavaType valueType) throws JsonMappingException {
// First: have we already seen it?
JsonDeserializer<Object> deser = _rootDeserializers.get(valueType);
if (deser != null) {
return deser;
}
// Nope: need to ask provider to resolve it
deser = _provider.findTypedValueDeserializer(cfg, valueType, null);
if (deser == null) { // can this happen?
throw new JsonMappingException("Can not find a deserializer for type " + valueType);
}
_rootDeserializers.put(valueType, deser);
return deser;
}