using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Markup;

namespace ZeroLevel.WPF
{
    public abstract class BaseConvertor<T>
        : MarkupExtension, IValueConverter
        where T : class, new()
    {
        /// <summary>
        /// Must be implemented in inheritor.
        /// </summary>
        public abstract object Convert(object value, Type targetType, object parameter, CultureInfo culture);

        /// <summary>
        /// Override if needed.
        /// </summary>
        public virtual object ConvertBack(object value, Type targetType, object parameter,
            CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #region MarkupExtension members
        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
        #endregion
    }
}