CODEWITHSUNDEEP
c#jsonunity-game-engine
Olivier Pons
Olivier Pons

Reputation: 15796

Generic array constructor

Here's my code that converts a Json to a class of my own:

JSONArray boats = p["data"]["game"]["start"]["boats"].AsArray;
j.data.game.start.boats = new JsonGameDetailBoat[boats.Count];
for (int i = 0; i < boats.Count; i++) {
    JSONNode boat = boats[i];
    j.data.game.start.boats[i] = new JsonGameDetailBoat {
        name = boat["name"],
        total = boat["total"]
    };
}
JSONArray board = p["data"]["game"]["board"].AsArray;
j.data.game.board = new JsonGameDataCell[board.Count][];
for (int i = 0; i < board.Count; i++) {
    /* almost same code than previous loop */
}

Watch the last lines: I have to make another loop, to make the same thing.

And I'll have to do this 4 more times.

So I'm trying to make a generic that would convert a JSONArray to a custom class, and fetch each properties of as string and read them from the JSON array.

My code looks like this but it doesn't work, and I dont know if it's possible to enumerate the public properties of a class.

public class JSONArrayConverter<T>
{
    public JSONArrayConverter(JSONNode p)
    {
        JSONArray tab = p.AsArray;
        IList<T> result;
        for (int i = 0; i < tab.Count; i++) {
            JSONNode value = tab[i];
            result[i] = new <T>();
        }
    }
}

This code doesn't work, I'm stuck here: result[i] = new <T>();

Upvotes: 0

Views: 94

Answers (1)

rokkerboci
rokkerboci

Reputation: 1167

You can use Reflection

public JSONArrayConverter(JSONNode p)
{
    JSONArray tab = p.AsArray;
    IList<T> result = new List<T>();
    for (int i = 0; i < tab.Count(); i++)
    {
        JSONNode value = tab[i];
        result[i] = (T)Activator.CreateInstance(typeof(T), value);
    }
}

or an interface:

public interface JSONConvertable
{
    void Initialise(JSONNode node);
}

public class JSONArrayConverter<T> where T : JSONConvertable, new()
{
    public JSONArrayConverter(JSONNode p)
    {
        JSONArray tab = p.AsArray;
        IList<T> result = new List<T>();
        for (int i = 0; i < tab.Count(); i++)
        {
            JSONNode value = tab[i];
            result[i] = new T();
            result[i].Initialise(value);
        }
    }
}

EDIT:

Or callback

public JSONArrayConverter(JSONNode p, Func<JSONNode, T> creator)
{
    JSONArray tab = p.AsArray;
    IList<T> result = new List<T>();
    for (int i = 0; i < tab.Count(); i++)
    {
        JSONNode value = tab[i];
        result[i] = creator(value);
    }
}

Upvotes: 2

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