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

package holeg.adapter;

import com.google.gson.*;
import holeg.model.AbstractCanvasObject;
import holeg.model.Edge;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

public class EdgeDeserializer implements JsonDeserializer<Edge> {
    public Map<Integer, AbstractCanvasObject> idMap= new HashMap<>();



    @Override
    public Edge deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        JsonObject jsonObj = json.getAsJsonObject();
        Edge edge = new Edge(idToCanvasObject(jsonObj.get("idA").getAsInt()),
                idToCanvasObject(jsonObj.get("idB").getAsInt()),
                jsonObj.get("maxCapacity").getAsFloat());
        edge.mode = Edge.EdgeMode.valueOf(jsonObj.get("mode").getAsString());
        return edge;
    }

    private AbstractCanvasObject idToCanvasObject(int id) throws JsonParseException{
        AbstractCanvasObject object = idMap.get(id);
        if(object == null){
            throw new JsonParseException("Cannot find AbstractCanvasObject with id: " + id);
        }
        return object;
    }
}