Develop Reference

Parsing single JSON element as array

One of the fields in my JSON response is a String[] when containing more than one element, and a String when it's just one. Like this:
"assets": [
"0901d196804adc1c",
"0901d196804ebd93",
"0901d196804ea5e2"
]
"assets": "0901d196804adc1c"
Ideally, I would like to get a String[] always, so if the JSON type of the element is String, convert it to a String[] with one element.
How can I do that?

If you cannot edit the response on the server side: Please refer to this question and answers, looks quite similar to your situation.
If you can edit the response, just reply always with String arrays (f.e. "assets": ["0901d196804adc1c"]).

You have two options:
1) Implement custom type adapter for gson to handle such situations (preferable solution).
2) Define field of type Object and cast it to the appropriate type at runtime
public static class AssetsContainer{
private Object assets;
public List<String> getAssets() {
if(assets instanceof List<?>) {
return (List<String>) assets;
} else if(assets instanceof String){
return Arrays.asList((String) assets);
} else {
//TODO: handle
return null;
}
}
}

How about using the TypeAdapter API?
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(SingletonListTypeAdapter.FACTORY)
.create();
The following will check for non-array JSON types when expecting array types and try to make them into singleton Java Lists. (Note that this uses Lists, not arrays. You can adapt it if you want, but Effective Java notes that application-layer code should prefer the Collections APIs over arrays.)
final class SingletonListTypeAdapter<T> extends TypeAdapter<List<T>> {
static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
#SuppressWarnings("unchecked")
#Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
if (type.getRawType() != List.class) {
return null;
}
TypeToken<?> collectionElementType = TypeToken.get(
getCollectionElementType((ParameterizedType) type.getType()));
TypeAdapter<List<Object>> delegate = (TypeAdapter<List<Object>>)
gson.getDelegateAdapter(this, collectionElementType);
return (TypeAdapter<T>) new SingletonListTypeAdapter<>(delegate);
}
};
private final TypeAdapter<T> delegate;
SingletonListTypeAdapter(TypeAdapter<T> delegate) {
this.delegate = delegate;
}
#Override public void write(JsonWriter out, List<T> value) throws IOException {
out.beginArray();
for (int i = 0, size = value.size(); i < size; i++) {
delegate.write(out, value.get(i));
}
out.endArray();
}
#Override public List<T> read(JsonReader in) throws IOException {
if (in.peek() != BEGIN_ARRAY) {
return Collections.singletonList(delegate.read(in));
}
in.beginArray();
List<T> expanding = new ArrayList<>();
while (in.hasNext()) {
expanding.add(delegate.read(in));
}
in.endArray();
return Collections.unmodifiableList(expanding);
}
static Type getCollectionElementType(ParameterizedType type) {
Type[] types = type.getActualTypeArguments();
Type paramType = types[0];
if (paramType instanceof WildcardType) {
return ((WildcardType) paramType).getUpperBounds()[0];
}
return paramType;
}
}

Make GSON accept single objects where it expects arrays

I have bunch of model classes which have fields of type List<X> where X is one of many things (e.g. String, Integer, but also some of my own types). I'm using GSON to parse JSON representations of these models.
My problem is that the server I'm dealing with (which is beyond my control) somehow removed singleton arrays and replaces them by the contained object.
For example, instead of returning:
{
"foo": [ "bar"],
"bleh": [ { "some": "object" } ]
}
It returns:
{
"foo": "bar",
"bleh": { "some": "object" }
}
Now assume that the Java model class look something like this:
public class Model {
private List<String> foo;
private List<SomeObject> bleh;
}
Currently this causes GSON to throw an exception because it finds BEGIN_STRING or BEGIN_OBJECT where it expects BEGIN_ARRAY.
For arrays or lists of Strings this is easily solved using a TypeAdapter<List<String>>. But the problem is I have Lists with many different element types and I don't want to write a separate TypeAdapter for each case. Nor have I been able to a generic TypeAdapter<List<?>>, because at some point you need to know the type.
So is there another way to configure GSON to be smart enough to turn single objects or values into arrays/lists? Or in other words, just "pretend" that the [ and ] are there where it expects to find them although they aren't there?

But the problem is I have Lists with many different element types and I don't want to write a separate TypeAdapter for each case. Nor have I been able to a generic TypeAdapter>, because at some point you need to know the type.
This is what type adapter factories are designed for: you can control every type in Gson instance configuration.
final class AlwaysListTypeAdapterFactory<E>
implements TypeAdapterFactory {
// Gson can instantiate it itself
private AlwaysListTypeAdapterFactory() {
}
#Override
public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> typeToken) {
// If it's not a List -- just delegate the job to Gson and let it pick the best type adapter itself
if ( !List.class.isAssignableFrom(typeToken.getRawType()) ) {
return null;
}
// Resolving the list parameter type
final Type elementType = resolveTypeArgument(typeToken.getType());
#SuppressWarnings("unchecked")
final TypeAdapter<E> elementTypeAdapter = (TypeAdapter<E>) gson.getAdapter(TypeToken.get(elementType));
// Note that the always-list type adapter is made null-safe, so we don't have to check nulls ourselves
#SuppressWarnings("unchecked")
final TypeAdapter<T> alwaysListTypeAdapter = (TypeAdapter<T>) new AlwaysListTypeAdapter<>(elementTypeAdapter).nullSafe();
return alwaysListTypeAdapter;
}
private static Type resolveTypeArgument(final Type type) {
// The given type is not parameterized?
if ( !(type instanceof ParameterizedType) ) {
// No, raw
return Object.class;
}
final ParameterizedType parameterizedType = (ParameterizedType) type;
return parameterizedType.getActualTypeArguments()[0];
}
private static final class AlwaysListTypeAdapter<E>
extends TypeAdapter<List<E>> {
private final TypeAdapter<E> elementTypeAdapter;
private AlwaysListTypeAdapter(final TypeAdapter<E> elementTypeAdapter) {
this.elementTypeAdapter = elementTypeAdapter;
}
#Override
public void write(final JsonWriter out, final List<E> list) {
throw new UnsupportedOperationException();
}
#Override
public List<E> read(final JsonReader in)
throws IOException {
// This is where we detect the list "type"
final List<E> list = new ArrayList<>();
final JsonToken token = in.peek();
switch ( token ) {
case BEGIN_ARRAY:
// If it's a regular list, just consume [, <all elements>, and ]
in.beginArray();
while ( in.hasNext() ) {
list.add(elementTypeAdapter.read(in));
}
in.endArray();
break;
case BEGIN_OBJECT:
case STRING:
case NUMBER:
case BOOLEAN:
// An object or a primitive? Just add the current value to the result list
list.add(elementTypeAdapter.read(in));
break;
case NULL:
throw new AssertionError("Must never happen: check if the type adapter configured with .nullSafe()");
case NAME:
case END_ARRAY:
case END_OBJECT:
case END_DOCUMENT:
throw new MalformedJsonException("Unexpected token: " + token);
default:
throw new AssertionError("Must never happen: " + token);
}
return list;
}
}
}
Now you just have to tell Gson which fields are not well-formed.
Of course, you might configure the whole Gson instance to accept such lists, but let it be more precise using the #JsonAdapter annotation:
final class Model {
#JsonAdapter(AlwaysListTypeAdapterFactory.class)
final List<String> foo = null;
#JsonAdapter(AlwaysListTypeAdapterFactory.class)
final List<SomeObject> bleh = null;
#Override
public String toString() {
return "Model{" + "foo=" + foo + ", bleh=" + bleh + '}';
}
}
final class SomeObject {
final String some = null;
#Override
public String toString() {
return "SomeObject{" + "some='" + some + '\'' + '}';
}
}
Test data:
single.json
{
"foo": "bar",
"bleh": {"some": "object"}
}
list.json
{
"foo": ["bar"],
"bleh": [{"some": "object"}]
}
Example:
private static final Gson gson = new Gson();
public static void main(final String... args)
throws IOException {
for ( final String resource : ImmutableList.of("single.json", "list.json") ) {
try ( final JsonReader jsonReader = getPackageResourceJsonReader(Q43412261.class, resource) ) {
final Model model = gson.fromJson(jsonReader, Model.class);
System.out.println(model);
}
}
}
And the output:
Model{foo=[bar], bleh=[SomeObject{some='object'}]}
Model{foo=[bar], bleh=[SomeObject{some='object'}]}

You can simply write your own JsonDeserializer where you check whether your bleh or foo are JsonObjects or JsonArrays.
To check if a JsonElement is an array or an object:
JsonElement element = ...;
if (element.isJsonObject()) {
//element is a JsonObject
} else if (element.isJsonArray()) {
//element is a JsonArray
}

One solution to this would be to write a custom TypeAdapterFactory which creates an adapter which peeks at the JSON data. If it encounters something other than a JSON array (or JSON null) it wraps it inside a JSON array before deserializing it:
// Only intended for usage with #JsonAdapter on fields
class SingleValueOrListAdapterFactory implements TypeAdapterFactory {
#Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
// Note: Cannot use getDelegateAdapter due to https://github.com/google/gson/issues/1028
TypeAdapter<T> listAdapterDelegate = gson.getAdapter(type);
TypeAdapter<JsonElement> jsonElementAdapter = gson.getAdapter(JsonElement.class);
return new TypeAdapter<T>() {
#Override
public void write(JsonWriter out, T value) throws IOException {
listAdapterDelegate.write(out, value);
}
#Override
public T read(JsonReader in) throws IOException {
JsonToken peeked = in.peek();
if (peeked == JsonToken.NULL || peeked == JsonToken.BEGIN_ARRAY) {
return listAdapterDelegate.read(in);
} else {
// Wrap JSON element in a new JSON array before deserializing it
JsonElement jsonElement = jsonElementAdapter.read(in);
JsonArray jsonArray = new JsonArray();
jsonArray.add(jsonElement);
return listAdapterDelegate.fromJsonTree(jsonArray);
}
}
};
}
}
The above implementation is designed only for usage with #JsonAdapter on fields, for example:
#JsonAdapter(SingleValueOrListAdapterFactory.class)
private List<MyClass> myField;
Compared to the currently accepted answer this provides the following advantages because it simply delegates the actual deserialization to listAdapterDelegate:
Custom List (or Collection) subclasses are supported because creation of them is delegated to Gson
Gson's default type resolution logic is used to determine the element type and to deserialize it
But it also has the following disadvantage:
Decreased performance because if the data is not already in a JSON array it is first deserialized to a JsonElement before the actual deserialization is performed

When using the GSON library, you could just check whether or not the following token is an object or an array. This of course requires you to go more fine grained while parsing the XML, but it allows you full control of what do you want to get from it. Sometimes we are not under control of the XML, and it could come handy.
This is an example to check if the next token is an object or an array, using the JsonReader class to parse the file:
if (jsonReader.peek() == JsonToken.BEGIN_ARRAY) {
jsonReader.beginArray()
} else if (jsonReader.peek() == JsonToken.BEGIN_OBJECT) {
jsonReader.beginObject()
}
And at the end of the array / object, you could do the same, but for the end tokens:
if (jsonReader.peek() == JsonToken.END_ARRAY) {
jsonReader.endArray()
} else if (jsonReader.peek() == JsonToken.END_OBJECT) {
jsonReader.endObject()
}
This way, you could have identical code (adding an extra check, to verify if you are on an array or on an object) to parse your array of objects, or a single object.

I had this same problem consuming xml / json from a vendor - they certainly weren't going to change their code for me :) There were several resources on the web that I used before changing adapting them to my own version This SO answer was very helpful. I spent some time looking at the gson code and finding a lot of private variable that I wanted access to. So, essentially what my custom collection adapter does is peek to see if the next element is an object. If not, we just delegate the read to the previous adapter (that we have overridden).
If the next element is an object, we use gson to process that. We then convert that to an array of one object. Use gson to write that to a string, then pass that string as a JsonReader to the underlying adapter. This can then create an instance of the underlying list and add the one element we have.
Here's the AdapterTypeFactory:
public enum ListSingleObjectAdapterFactory implements TypeAdapterFactory {
INSTANCE; // Josh Bloch's Enum singleton pattern
#SuppressWarnings({ "unchecked", "rawtypes" })
#Override
public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> typeToken) {
Class<? super T> rawType = typeToken.getRawType();
if (!Collection.class.isAssignableFrom(rawType)) {
return null;
}
TypeAdapter collectionAdapter = gson.getDelegateAdapter(this, typeToken);
Class genericClass = (Class) ((ParameterizedType) typeToken.getType())
.getActualTypeArguments()[0];
return new SingleObjectOrCollectionAdapter(
gson, collectionAdapter, genericClass);
}
}
Then the type adapter I have is:
public class SingleObjectOrCollectionAdapter<T> extends TypeAdapter<Collection<T>> {
private Class<T> adapterclass;
private Gson gson;
private TypeAdapter arrayTypeAdapter;
public SingleObjectOrCollectionAdapter(Gson gson, TypeAdapter<T> collectionTypeAdapter, Class<T> componentType) {
arrayTypeAdapter = collectionTypeAdapter;
this.gson = gson;
adapterclass = componentType;
}
#Override
public Collection<T> read(JsonReader reader) throws IOException {
Collection<T> collection;
JsonReader myReader = reader;
if (reader.peek() == JsonToken.BEGIN_OBJECT) {
T inning = gson.fromJson(reader, adapterclass);
String s = gson.toJson(new Object[]{inning});
myReader = new JsonReader(new StringReader(s));
}
collection = (Collection)arrayTypeAdapter.read( myReader );
return collection;
}
#Override
public void write(JsonWriter writer, Collection<T> value) throws IOException {
arrayTypeAdapter.write(writer, value);
}
}
Finally, we need to register the adapter factory:
GsonBuilder gb = new GsonBuilder().registerTypeAdapterFactory(ListSingleObjectAdapterFactory.INSTANCE);
So far, it seems to be working well handling both single and multiple objects - although I wouldn't be surprised if it needs some tweaking down the road.

Gson deserialize JSON array with multiple object types

I have some odd JSON like:
[
{
"type":"0",
"value":"my string"
},
{
"type":"1",
"value":42
},
{
"type":"2",
"value": {
}
}
]
Based on some field, the object in the array is a certain type.
Using Gson, my thought is to have a TypeAdapterFactory that sends delegate adapters for those certain types to a TypeAdapter, but I'm hung up on understanding a good way of reading that "type" field to know which type to create.
In the TypeAdapter,
Object read(JsonReader in) throws IOException {
String type = in.nextString();
switch (type) {
// delegate to creating certain types.
}
}
would assume the "type" field comes first in my JSON. Is there a decent way to remove that assumption?

Here is some code I wrote to handle an array of NewsFeedArticle and NewsFeedAd items in Json. Both items implement a marker interface NewsFeedItem to allow me to easily check if the TypeAdater should be used for a particular field.
public class NewsFeedItemTypeAdapterFactory implements TypeAdapterFactory {
#Override
#SuppressWarnings("unchecked")
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
if (!NewsFeedItem.class.isAssignableFrom(type.getRawType())) {
return null;
}
TypeAdapter<JsonElement> jsonElementAdapter = gson.getAdapter(JsonElement.class);
TypeAdapter<NewsFeedArticle> newsFeedArticleAdapter = gson.getDelegateAdapter(this, TypeToken.get(NewsFeedArticle.class));
TypeAdapter<NewsFeedAd> newsFeedAdAdapter = gson.getDelegateAdapter(this, TypeToken.get(NewsFeedAd.class));
return (TypeAdapter<T>) new NewsFeedItemTypeAdapter(jsonElementAdapter, newsFeedArticleAdapter, newsFeedAdAdapter).nullSafe();
}
private static class NewsFeedItemTypeAdapter extends TypeAdapter<NewsFeedItem> {
private final TypeAdapter<JsonElement> jsonElementAdapter;
private final TypeAdapter<NewsFeedArticle> newsFeedArticleAdapter;
private final TypeAdapter<NewsFeedAd> newsFeedAdAdapter;
NewsFeedItemTypeAdapter(TypeAdapter<JsonElement> jsonElementAdapter,
TypeAdapter<NewsFeedArticle> newsFeedArticleAdapter,
TypeAdapter<NewsFeedAd> newsFeedAdAdapter) {
this.jsonElementAdapter = jsonElementAdapter;
this.newsFeedArticleAdapter = newsFeedArticleAdapter;
this.newsFeedAdAdapter = newsFeedAdAdapter;
}
#Override
public void write(JsonWriter out, NewsFeedItem value) throws IOException {
if (value.getClass().isAssignableFrom(NewsFeedArticle.class)) {
newsFeedArticleAdapter.write(out, (NewsFeedArticle) value);
} else if (value.getClass().isAssignableFrom(NewsFeedAd.class)) {
newsFeedAdAdapter.write(out, (NewsFeedAd) value);
}
}
#Override
public NewsFeedItem read(JsonReader in) throws IOException {
JsonObject objectJson = jsonElementAdapter.read(in).getAsJsonObject();
if (objectJson.has("Title")) {
return newsFeedArticleAdapter.fromJsonTree(objectJson);
} else if (objectJson.has("CampaignName")) {
return newsFeedAdAdapter.fromJsonTree(objectJson);
}
return null;
}
}
}
You can then register this with Gson using the following code.
return new GsonBuilder()
.registerTypeAdapterFactory(new NewsFeedItemTypeAdapterFactory())
.create();

Gson custom deserializer for generic types

I have a number of classes that implement a single interface type. I want to write a custom deserializer to be able to handle some special case with the json I have to deserialize. Is this possible with google gson? Here is the sample code I have so far:
Class Type:
public class MyClass implements MyInterface {
.......
}
Deserializer
public class ResponseDeserializer implements JsonDeserializer<MyInterface>
{
private Gson fGson;
public ResponseDeserializer()
{
fGson = new Gson();
}
#Override
public MyInterface deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException
{
String jsonString = json.toString();
if(jsonString.substring(0, 0).equals("["))
{
jsonString = "{ \"parameter\":" + jsonString + "}";
}
return context.deserialize(json, typeOfT);
}
}
register and call fromJson method:
#Override
public <T extends MyInterface> T createResponse(Class<T> responseType)
{
T returnObject = new GsonBuilder().registerTypeAdapter(MyInterface.class, new ResponseDeserializer())
.create().fromJson(getEntityText(), responseType);
return returnObject;
}
thanks for the help in advance

First of all, registerTypeAdapter() is not covariant; if you want to link a TypeAdapter to an interface, you have to use a TypeAdapterFactory. See: How do I implement TypeAdapterFactory in Gson?
Secondly, why do you think that [{...},{...},{...}] is not valid Json? Of course it is:
{
"foo":[
{
"type":"bar"
},
{
"type":"baz"
}
]
}
This is a mapping of key foo an array of objects, with one member variable. Gson would automatically deserialize it with the following POJOs:
public class MyObject {
List<TypedObject> foo;
}
public class TypedObject {
String type;
}
Beyond that, I can't help you more without knowing your specific Json string. This (especially that first link) should be enough to get started, however.

How to serialize a class with an interface?

I have never done much with serialization, but am trying to use Google's gson to serialize a Java object to a file. Here is an example of my issue:
public interface Animal {
public String getName();
}
public class Cat implements Animal {
private String mName = "Cat";
private String mHabbit = "Playing with yarn";
public String getName() {
return mName;
}
public void setName(String pName) {
mName = pName;
}
public String getHabbit() {
return mHabbit;
}
public void setHabbit(String pHabbit) {
mHabbit = pHabbit;
}
}
public class Exhibit {
private String mDescription;
private Animal mAnimal;
public Exhibit() {
mDescription = "This is a public exhibit.";
}
public String getDescription() {
return mDescription;
}
public void setDescription(String pDescription) {
mDescription = pDescription;
}
public Animal getAnimal() {
return mAnimal;
}
public void setAnimal(Animal pAnimal) {
mAnimal = pAnimal;
}
}
public class GsonTest {
public static void main(String[] argv) {
Exhibit exhibit = new Exhibit();
exhibit.setAnimal(new Cat());
Gson gson = new Gson();
String jsonString = gson.toJson(exhibit);
System.out.println(jsonString);
Exhibit deserializedExhibit = gson.fromJson(jsonString, Exhibit.class);
System.out.println(deserializedExhibit);
}
}
So this serializes nicely -- but understandably drops the type information on the Animal:
{"mDescription":"This is a public exhibit.","mAnimal":{"mName":"Cat","mHabbit":"Playing with yarn"}}
This causes real problems for deserialization, though:
Exception in thread "main" java.lang.RuntimeException: No-args constructor for interface com.atg.lp.gson.Animal does not exist. Register an InstanceCreator with Gson for this type to fix this problem.
I get why this is happening, but am having trouble figuring out the proper pattern for dealing with this. I did look in the guide but it didn't address this directly.

Here is a generic solution that works for all cases where only interface is known statically.
Create serialiser/deserialiser:
final class InterfaceAdapter<T> implements JsonSerializer<T>, JsonDeserializer<T> {
public JsonElement serialize(T object, Type interfaceType, JsonSerializationContext context) {
final JsonObject wrapper = new JsonObject();
wrapper.addProperty("type", object.getClass().getName());
wrapper.add("data", context.serialize(object));
return wrapper;
}
public T deserialize(JsonElement elem, Type interfaceType, JsonDeserializationContext context) throws JsonParseException {
final JsonObject wrapper = (JsonObject) elem;
final JsonElement typeName = get(wrapper, "type");
final JsonElement data = get(wrapper, "data");
final Type actualType = typeForName(typeName);
return context.deserialize(data, actualType);
}
private Type typeForName(final JsonElement typeElem) {
try {
return Class.forName(typeElem.getAsString());
} catch (ClassNotFoundException e) {
throw new JsonParseException(e);
}
}
private JsonElement get(final JsonObject wrapper, String memberName) {
final JsonElement elem = wrapper.get(memberName);
if (elem == null) throw new JsonParseException("no '" + memberName + "' member found in what was expected to be an interface wrapper");
return elem;
}
}
make Gson use it for the interface type of your choice:
Gson gson = new GsonBuilder().registerTypeAdapter(Animal.class, new InterfaceAdapter<Animal>())
.create();

Put the animal as transient, it will then not be serialized.
Or you can serialize it yourself by implementing defaultWriteObject(...) and defaultReadObject(...) (I think thats what they were called...)
EDIT See the part about "Writing an Instance Creator" here.
Gson cant deserialize an interface since it doesnt know which implementing class will be used, so you need to provide an instance creator for your Animal and set a default or similar.

#Maciek solution works perfect if the declared type of the member variable is the interface / abstract class. It won't work if the declared type is sub-class / sub-interface / sub-abstract class unless we register them all through registerTypeAdapter(). We can avoid registering one by one with the use of registerTypeHierarchyAdapter, but I realize that it will cause StackOverflowError because of the infinite loop. (Please read reference section below)
In short, my workaround solution looks a bit senseless but it works without StackOverflowError.
#Override
public JsonElement serialize(T object, Type interfaceType, JsonSerializationContext context) {
final JsonObject wrapper = new JsonObject();
wrapper.addProperty("type", object.getClass().getName());
wrapper.add("data", new Gson().toJsonTree(object));
return wrapper;
}
I used another new Gson instance of work as the default serializer / deserializer to avoid infinite loop. The drawback of this solution is you will also lose other TypeAdapter as well, if you have custom serialization for another type and it appears in the object, it will simply fail.
Still, I am hoping for a better solution.
Reference
According to Gson 2.3.1 documentation for JsonSerializationContext and JsonDeserializationContext
Invokes default serialization on the specified object passing the specific type information. It should never be invoked on the element received as a parameter of the JsonSerializer.serialize(Object, Type, JsonSerializationContext) method. Doing so will result in an infinite loop since Gson will in-turn call the custom serializer again.
and
Invokes default deserialization on the specified object. It should never be invoked on the element received as a parameter of the JsonDeserializer.deserialize(JsonElement, Type, JsonDeserializationContext) method. Doing so will result in an infinite loop since Gson will in-turn call the custom deserializer again.
This concludes that below implementation will cause infinite loop and cause StackOverflowError eventually.
#Override
public JsonElement serialize(Animal src, Type typeOfSrc,
JsonSerializationContext context) {
return context.serialize(src);
}

I had the same problem, except my interface was of primitive type (CharSequence) and not JsonObject:
if (elem instanceof JsonPrimitive){
JsonPrimitive primitiveObject = (JsonPrimitive) elem;
Type primitiveType =
primitiveObject.isBoolean() ?Boolean.class :
primitiveObject.isNumber() ? Number.class :
primitiveObject.isString() ? String.class :
String.class;
return context.deserialize(primitiveObject, primitiveType);
}
if (elem instanceof JsonObject){
JsonObject wrapper = (JsonObject) elem;
final JsonElement typeName = get(wrapper, "type");
final JsonElement data = get(wrapper, "data");
final Type actualType = typeForName(typeName);
return context.deserialize(data, actualType);
}