MVVM for Multi Platforms

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using GeographicRepresentation.Interfaces;
using GeographicRepresentation.Lib.ViewModel;
using GeographicRepresentation.Lib.Model;

namespace GeographicRepresentation.Lib
{
    /// <summary>
    /// This class is used as a connector between the View and the view model. It offers creation of interfaces 
    /// For a specific data
    /// </summary>
    public class InterfacesFactory
    {
        #region Singleton

        static InterfacesFactory m_Instance = null;

        public static InterfacesFactory Instance
        {
            get
            {
                if (m_Instance == null)
                {
                    m_Instance = new InterfacesFactory();
                }
                return m_Instance;
            }
        }

        private InterfacesFactory()
        {
        }    

        #endregion

        public IEditableCityViewModel GetEditableCityViewModelForAdd(Guid countryId)
        {
            return new EditableCityViewModel(new City(),countryId);
        }

        public IEditableCityViewModel GetEditableCityViewModelForEdit(Guid cityId)
        {
            City city = DataManager.Instance.GetCity(cityId);
            return new EditableCityViewModel(city);
        }

        public IEditableCountryViewModel GetEditableCountryViewModelForAdd(Guid continentId)
        {
            return new EditableCountryViewModel(new Country(), continentId);
        }

        public IEditableCountryViewModel GetEditableCountryViewModelForEdit(Guid countryId)
        {
            Country country = DataManager.Instance.GetCountry(countryId);
            return new EditableCountryViewModel(country);
        }

        public IEditableContinentViewModel GetEditableContinentViewModelForAdd()
        {
            return new EditableContinentViewModel(new Continent(), false);
        }

        public IEditableContinentViewModel GetEditableContinentViewModelForEdit(Guid continentId)
        {
            Continent continent = DataManager.Instance.GetContinent(continentId);
            return new EditableContinentViewModel(continent, true);
        }

        public IContinentsListViewModel GetContinentsListViewModel()
        {
            return new ContinentsListViewModel();
        }            
    }

    /// <summary>
    /// The following class is used for setting the timeout interval for asynchronos operations in miliseconds
    /// </summary>
    public class WaitTimeManager
    {
        public static int Interval
        {
            get
            {
                return 5000;
            }
        }
    }
}