gson TypeAdapter that delegates to Jackson ObjectMapper

JacksonGsonTypeAdapter.java

package de.nikos410;

import java.lang.reflect.Type;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

/**
 * Use it like this:
 * 
 * <pre>
 *     gsonBuilder.registerTypeAdapter(MyType.class,
 * 	                   new de.nikos410.JacksonGsonTypeAdapter<>(
 * 		                        jacksonObjectMapper, MyType.class));
 * </pre>
 */
public class JacksonGsonTypeAdapter<T>
		implements JsonSerializer<T>, JsonDeserializer<T> {

	private final ObjectMapper jacksonObjectMapper;
	private final Class<T> typeClass;

	private final Gson gson;

	private JacksonGsonTypeAdapter(ObjectMapper jacksonObjectMapper,
			Class<T> typeClass) {
		this.jacksonObjectMapper = jacksonObjectMapper;
		this.typeClass = typeClass;

		this.gson = new GsonBuilder().create();
	}

	@Override
	public JsonElement serialize(T dto, Type typeOfSrc,
			JsonSerializationContext context) {

		try {
			final String valueAsString =
					jacksonObjectMapper.writeValueAsString(dto);
			return gson.fromJson(valueAsString, JsonObject.class);
		} catch (JsonProcessingException e) {
			throw new IllegalStateException("Could not serialize " + dto, e);
		}
	}

	@Override
	public T deserialize(JsonElement json, Type typeOfT,
			JsonDeserializationContext context) throws JsonParseException {

		try {

			final String valueAsString = gson.toJson(json);
			return jacksonObjectMapper.readValue(valueAsString, typeClass);
		} catch (JsonProcessingException e) {
			throw new JsonParseException(e);
		}
	}
}