Examples with TypeAdapter com.google.gson.TypeAdapter used on opensource projects

Example 21 with TypeAdapter

use of com.google.gson.TypeAdapter in project edx-app-android by edx.

the class RuntimeTypeAdapterFactory method create.

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }
    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();
            // registration requires that subtype extends T
            @SuppressWarnings("unchecked") 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);
            // registration requires that subtype extends T
            @SuppressWarnings("unchecked") 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);
        }
    };
}

Example 22 with TypeAdapter

use of com.google.gson.TypeAdapter in project harvest-client by 3AP-AG.

the class ReferenceDtoAdapter method create.

@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
    Class<? super T> rawType = type.getRawType();
    log.trace("Called create with {}", type);
    if (rawType != Reference.class) {
        return null;
    }
    Class<?> elementClass = parseReferenceType(type);
    String simpleName = elementClass.getSimpleName();
    String expectedClassName = simpleName + DTO_SUFFIX;
    try {
        Class<?> dtoClass = Class.forName(BaseReferenceDto.class.getPackage().getName() + "." + expectedClassName);
        log.trace("Got Dto class {}", dtoClass);
        TypeAdapter<?> delegate = gson.getAdapter(dtoClass);
        log.trace("Returning type adapter for {}", type);
        return new TypeAdapter<T>() {

            @Override
            public void write(JsonWriter out, T value) throws IOException {
                if (value == null) {
                    out.nullValue();
                    return;
                }
                Reference reference = (Reference) value;
                out.value(reference.getId());
            }

            @Override
            @SuppressWarnings("unchecked")
            public T read(JsonReader in) throws IOException {
                return (T) delegate.read(in);
            }
        };
    } catch (ClassNotFoundException e) {
        throw new HarvestRuntimeException("Could not find ReferenceDto. Reference<" + simpleName + "> needs a class named " + expectedClassName + " to existing in the same package as ReferenceDto", e);
    }
}

Example 23 with TypeAdapter

use of com.google.gson.TypeAdapter in project zeppelin by apache.

the class RuntimeTypeAdapterFactory method create.

public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
    if (type.getRawType() != baseType) {
        return null;
    }
    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);
            String label = (labelJsonElement == null ? null : labelJsonElement.getAsString());
            // registration requires that subtype extends T
            @SuppressWarnings("unchecked") 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);
            // registration requires that subtype extends T
            @SuppressWarnings("unchecked") 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) && !srcType.getSimpleName().equals("OldInput")) {
                throw new JsonParseException("cannot serialize " + srcType.getName() + " because it already defines a field named " + typeFieldName);
            }
            JsonObject clone = new JsonObject();
            if (!srcType.getSimpleName().equals("OldInput")) {
                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();
}