Example usage for com.google.gson TypeAdapter fromJsonTree

Introduction

In this page you can find the example usage for com.google.gson TypeAdapter fromJsonTree.

Prototype

public final T fromJsonTree(JsonElement jsonTree)

Source Link

Document

Converts jsonTree to a Java object.

Usage

From source file:saulmm.avengers.model.rest.CharacterItemAdapterFactory.java

License:Mozilla Public License

@Override
public <T> TypeAdapter<T> create(Gson gson, final TypeToken<T> type) {

    final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
    final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);

    final TypeAdapter<T> customTypeAdapter = new TypeAdapter<T>() {

        @Override//  w  w  w .  j a v  a  2  s  .  c o m
        public void write(JsonWriter out, T value) throws IOException {
            delegate.write(out, value);
        }

        @Override
        public T read(JsonReader in) throws IOException {

            JsonElement jsonElement = elementAdapter.read(in);

            if (type.getRawType() == saulmm.avengers.model.Character.class)
                return adaptJsonToCharacter(jsonElement, type);

            if (type.getRawType() == List.class)
                return adaptJsonToComic(jsonElement, type);

            return delegate.fromJsonTree(jsonElement);
        }

    }.nullSafe();

    return customTypeAdapter;
}

From source file:se.joelpet.android.toyreaderforreddit.gson.typeadapters.RuntimeTypeAdapterFactory.java

License:Apache License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }//from  www  .ja  v a2s  . c om

    final Map<String, TypeAdapter<?>> labelToDelegate = new LinkedHashMap<String, TypeAdapter<?>>();
    final Map<Class<?>, TypeAdapter<?>> subtypeToDelegate = new LinkedHashMap<Class<?>, TypeAdapter<?>>();
    for (Map.Entry<String, Class<?>> entry : labelToSubtype.entrySet()) {
        TypeAdapter<?> delegate = gson.getDelegateAdapter(this, TypeToken.get(entry.getValue()));
        labelToDelegate.put(entry.getKey(), delegate);
        subtypeToDelegate.put(entry.getValue(), delegate);
    }

    return new TypeAdapter<R>() {
        @Override
        public R read(JsonReader in) throws IOException {
            JsonElement jsonElement = Streams.parse(in);
            JsonElement labelJsonElement = jsonElement.getAsJsonObject().remove(typeFieldName);
            if (labelJsonElement == null) {
                throw new JsonParseException("cannot deserialize " + baseType
                        + " because it does not define a field named " + typeFieldName);
            }
            String label = labelJsonElement.getAsString();
            @SuppressWarnings("unchecked") // registration requires that subtype extends T
            TypeAdapter<R> delegate = (TypeAdapter<R>) labelToDelegate.get(label);
            if (delegate == null) {
                throw new JsonParseException("cannot deserialize " + baseType + " subtype named " + label
                        + "; did you forget to register a subtype?");
            }

            // joep: take the "data" jsonElement
            return delegate.fromJsonTree(jsonElement.getAsJsonObject().remove("data"));
        }

        @Override
        public void write(JsonWriter out, R value) throws IOException {
            Class<?> srcType = value.getClass();
            String label = subtypeToLabel.get(srcType);
            @SuppressWarnings("unchecked") // registration requires that subtype extends T
            TypeAdapter<R> delegate = (TypeAdapter<R>) subtypeToDelegate.get(srcType);
            if (delegate == null) {
                throw new JsonParseException(
                        "cannot serialize " + srcType.getName() + "; did you forget to register a subtype?");
            }
            JsonObject jsonObject = delegate.toJsonTree(value).getAsJsonObject();
            if (jsonObject.has(typeFieldName)) {
                throw new JsonParseException("cannot serialize " + srcType.getName()
                        + " because it already defines a field named " + typeFieldName);
            }
            JsonObject clone = new JsonObject();
            clone.add(typeFieldName, new JsonPrimitive(label));
            for (Map.Entry<String, JsonElement> e : jsonObject.entrySet()) {
                clone.add(e.getKey(), e.getValue());
            }
            Streams.write(clone, out);
        }
    };
}

From source file:TestGenerator.ArgumentCache.UniversalArrayTypeAdapter.java

License:Apache License

@Override
public Object read(JsonReader in) throws IOException {
    if (in.peek() == JsonToken.NULL) {
        in.nextNull();//  w ww  .  ja  v a 2s .c  o m
        return null;
    }

    List<E> list = new ArrayList<E>();
    in.beginArray();
    while (in.hasNext()) {
        //            E instance = componentTypeAdapter.read(in); // old code replacing below block
        E instance = null;
        JsonElement je = this.jsonElementAdapter.read(in);
        if (je.isJsonObject() && je.getAsJsonObject().has(UniversalTypeAdapterFactory.class_token)) {
            try {
                Class clazz = Class.forName(
                        je.getAsJsonObject().get(UniversalTypeAdapterFactory.class_token).getAsString());
                TypeAdapter newAdapter = context.getAdapter(clazz);
                instance = (E) newAdapter.fromJsonTree(je);
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        } else {
            instance = componentTypeAdapter.fromJsonTree(je);
        }
        list.add(instance);
    }
    in.endArray();
    Object array = Array.newInstance(componentType, list.size());
    for (int i = 0; i < list.size(); i++) {
        Array.set(array, i, list.get(i));
    }

    return array;
}

From source file:zardoni.matteo.SerializzazioneTimeline.test.RuntimeTypeAdapterFactory.java

License:Apache License

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }//  www . j  a v  a2s  .  co  m

    final Map<String, TypeAdapter<?>> labelToDelegate = new LinkedHashMap<String, TypeAdapter<?>>();
    final Map<Class<?>, TypeAdapter<?>> subtypeToDelegate = new LinkedHashMap<Class<?>, TypeAdapter<?>>();
    for (Map.Entry<String, Class<?>> entry : labelToSubtype.entrySet()) {
        TypeAdapter<?> delegate = gson.getDelegateAdapter(this, TypeToken.get(entry.getValue()));
        labelToDelegate.put(entry.getKey(), delegate);
        subtypeToDelegate.put(entry.getValue(), delegate);
    }

    return (new TypeAdapter<R>() {
        @Override
        public R read(JsonReader in) throws IOException {
            JsonElement jsonElement = Streams.parse(in);
            JsonElement labelJsonElement = jsonElement.getAsJsonObject().remove(typeFieldName);
            if (labelJsonElement == null) {
                throw new JsonParseException("cannot deserialize " + baseType
                        + " because it does not define a field named " + typeFieldName);
            }
            String label = labelJsonElement.getAsString();
            @SuppressWarnings("unchecked") // registration requires that subtype extends T
            TypeAdapter<R> delegate = (TypeAdapter<R>) labelToDelegate.get(label);
            if (delegate == null) {
                throw new JsonParseException("cannot deserialize " + baseType + " subtype named " + label
                        + "; did you forget to register a subtype?");
            }
            return delegate.fromJsonTree(jsonElement);
        }

        @Override
        public void write(JsonWriter out, R value) throws IOException {
            Class<?> srcType = value.getClass();
            String label = subtypeToLabel.get(srcType);
            @SuppressWarnings("unchecked") // registration requires that subtype extends T
            TypeAdapter<R> delegate = (TypeAdapter<R>) subtypeToDelegate.get(srcType);
            if (delegate == null) {
                throw new JsonParseException(
                        "cannot serialize " + srcType.getName() + "; did you forget to register a subtype?");
            }
            JsonObject jsonObject = delegate.toJsonTree(value).getAsJsonObject();
            if (jsonObject.has(typeFieldName)) {
                throw new JsonParseException("cannot serialize " + srcType.getName()
                        + " because it already defines a field named " + typeFieldName);
            }
            JsonObject clone = new JsonObject();
            clone.add(typeFieldName, new JsonPrimitive(label));
            for (Map.Entry<String, JsonElement> e : jsonObject.entrySet()) {
                clone.add(e.getKey(), e.getValue());
            }
            Streams.write(clone, out);
        }
    }).nullSafe();
}