private JSONObject getModel(String format){
		JSONObject models = null, model = null;
		ArrayList<String> keyList = new ArrayList<String>();
		try{
			models = new JSONObject(getModelFileData());

			if(format.equals("random") || format.length() <= 0){
				Iterator<?> keys = models.keys();
				while(keys.hasNext()){
					keyList.add(keys.next().toString());
				}
				String key = keyList.get(new Util().getRandomArrayNumber(keyList.size()));
				model = models.getJSONObject(key);
			}else{
				model = models.getJSONObject(format);
			}
		} catch (JSONException e){
			e.printStackTrace();
		}
		return model;
	}