praktikum-holons/src/holeg/adapter/AbstractCpsObjectAdapter.java

package holeg.adapter;

import java.lang.reflect.Type;

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.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

import holeg.model.AbstractCanvasObject;
import holeg.model.GroupNode;

public class AbstractCpsObjectAdapter
		implements JsonSerializer<AbstractCanvasObject>, JsonDeserializer<AbstractCanvasObject> {

	@Override
	public JsonElement serialize(AbstractCanvasObject object, Type type, JsonSerializationContext context) {
		JsonObject jsonObject = new JsonObject();
		jsonObject.add("type", new JsonPrimitive(object.getClass().getSimpleName()));
		jsonObject.add("properties", context.serialize(object, object.getClass()));
		if (object instanceof GroupNode)
			jsonObject.add("hash", new JsonPrimitive(object.hashCode()));
		return jsonObject;
	}

	@Override
	public AbstractCanvasObject deserialize(JsonElement ele, Type type, JsonDeserializationContext context)
			throws JsonParseException {
		JsonObject object = ele.getAsJsonObject();
		String typeName = object.get("type").getAsString();
		JsonElement element = object.get("properties");
		try {
			String packageName = AbstractCanvasObject.class.getPackageName() + ".";
			return context.deserialize(element, Class.forName(packageName + typeName));
		} catch (ClassNotFoundException cnfe) {
			throw new JsonParseException("Unknown element type: " + type, cnfe);
		}
	}

}