com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer Java Examples

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Example #1

Source File: DefaultJsonService.java From imagej-server with Apache License 2.0

4 votes

/**
 * Constructs and initializes a JsonService with an {@link ObjectService}.
 * 
 * @param objectService
 */
public DefaultJsonService(final ObjectService objectService) {

	idToObjDeserializer = new UntypedObjectDeserializer(null, null) {

		@Override
		public Object deserialize(JsonParser p, DeserializationContext ctxt)
			throws IOException, JsonProcessingException
		{
			final Object obj = super.deserialize(p, ctxt);
			if (!(obj instanceof String && ((String) obj).startsWith("object:")))
				return obj;
			final String id = (String) obj;
			if (!objectService.contains(id)) {
				throw new JsonMappingException(p, "Object does not exist");
			}
			final ObjectInfo info = objectService.find(id);
			info.updateLastUsed();
			return info.getObject();
		}
	};

	final JsonSerializer<Object> objToIdSerializer =
		new JsonSerializer<Object>()
	{

			@Override
			public void serialize(Object value, JsonGenerator gen,
				SerializerProvider serializers) throws IOException,
				JsonProcessingException
		{
				gen.writeString(objectService.register(value, "DefaultJsonService"));
			}

		};

	final SimpleModule objToIdModule = new SimpleModule();
	objToIdModule.setSerializerModifier(new BeanSerializerModifier() {

		@Override
		public JsonSerializer<?> modifySerializer(SerializationConfig config,
			BeanDescription beanDesc, JsonSerializer<?> serializer)
		{
			if (Mixins.support(beanDesc.getBeanClass())) return serializer;
			// If the serialized class is unknown (i.e. serialized using the general
			// BeanSerializer) or should not be serialized (i.e. complicated class
			// implemented interfaces such as Iterable), would be serialized as an
			// ID.
			if (serializer instanceof BeanSerializer) return objToIdSerializer;
			if (notSerialized(beanDesc.getBeanClass())) return objToIdSerializer;
			return serializer;

		}
	});
	objToIdMapper = new ObjectMapper();
	objToIdMapper.registerModule(objToIdModule);

	// register Jackson MixIns to obtain better json output format for some
	// specific types
	Mixins.registerMixIns(objToIdMapper);
}