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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Reflection;
using System.Resources;
using System.Text;
using System.Threading;
/*
* Avec ces deux resx (Strings.en.resx et Strings.resx) :
*
<data name="Blue" xml:space="preserve">
<value>blue</value>
</data>
<data name="Red" xml:space="preserve">
<value>red</value>
</data>
<data name="Sedan" xml:space="preserve">
<value>sedan</value>
</data>
<data name="SportsCar" xml:space="preserve">
<value>sports car</value>
</data>
<data name="This_is_a" xml:space="preserve">
<value>This is a</value>
</data>
<data name="UtilityCar" xml:space="preserve">
<value>utility car</value>
</data>
*
<data name="Blue" xml:space="preserve">
<value>bleue</value>
</data>
<data name="Red" xml:space="preserve">
<value>rouge</value>
</data>
<data name="Sedan" xml:space="preserve">
<value>berline</value>
</data>
<data name="SportsCar" xml:space="preserve">
<value>sportive</value>
</data>
<data name="This_is_a" xml:space="preserve">
<value>Ceci est une</value>
</data>
<data name="UtilityCar" xml:space="preserve">
<value>voiture utilitaire</value>
</data>
*
* ... ce programme affiche sur la sortie de la console :
*
This_is_a UtilityCar Blue.
Ceci est une voiture utilitaire bleue.
Ceci est une voiture utilitaire bleue.
Ceci est une voiture utilitaire bleue.
This_is_a Blue UtilityCar.
This is a blue utility car.
This is a blue utility car.
This is a blue utility car.
This_is_a Red SportsCar.
This is a red sports car.
This is a red sports car.
This is a red sports car.
*
*/
namespace CSharp.LocalizeStrategies
{
public abstract class LocalizeStrategy
{
private static Dictionary<Type, LocalizeStrategy> _strategies = new Dictionary<Type, LocalizeStrategy>();
public static LocalizeStrategy GetInstance<S>() where S : LocalizeStrategy
{
if (!_strategies.ContainsKey(typeof(S)))
_strategies.Add(typeof(S), Activator.CreateInstance<S>());
return _strategies[typeof(S)];
}
public abstract ILocalizer GetLocalizer(params object[] args);
}
public interface ILocalizer
{
LocalizeStrategy Strategy { get; }
string Localize(string token);
string Localize(ILocalizable subject, string token);
}
public abstract class BaseLocalizer : ILocalizer
{
public abstract LocalizeStrategy Strategy { get; }
public abstract string Localize(string token);
public abstract string Localize(ILocalizable subject, string token);
}
public class NullLocalizer : BaseLocalizer
{
private LocalizeStrategy _strategy = null;
public NullLocalizer(LocalizeStrategy strategy)
{
_strategy = strategy;
}
public override LocalizeStrategy Strategy { get { return _strategy; } }
public override string Localize(string token)
{
return token;
}
public override string Localize(ILocalizable subject, string token)
{
return token;
}
}
public class ResourceBasedLocalizer : NullLocalizer
{
private static ResourceManager _resMan = new ResourceManager(typeof(Strings));
public ResourceBasedLocalizer(LocalizeStrategy strategy)
: base(strategy)
{
}
public override string Localize(string token)
{
return _resMan.GetString(token, Thread.CurrentThread.CurrentCulture);
}
}
public class VehicleLocalizer : ResourceBasedLocalizer
{
public VehicleLocalizer(LocalizeStrategy strategy) : base(strategy)
{
}
public override string Localize(ILocalizable subject, string token)
{
return base.Localize(token);
}
}
[AttributeUsage(AttributeTargets.Property, Inherited = true)]
public class LocalizedAttribute : Attribute
{
private string _token = null;
public LocalizedAttribute() : this(String.Empty)
{
}
public LocalizedAttribute(string token)
{
_token = token;
}
public string Token { get { return _token; } }
}
public class AttributeBasedLocalizer : ResourceBasedLocalizer
{
public AttributeBasedLocalizer(LocalizeStrategy strategy)
: base(strategy)
{
}
public override string Localize(ILocalizable subject, string token)
{
string actualToken = token;
PropertyInfo[] props = subject.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty);
foreach (PropertyInfo prop in props)
{
LocalizedAttribute attr = Attribute.GetCustomAttribute(prop, typeof(LocalizedAttribute), true) as LocalizedAttribute;
if (attr.Token == token)
{
actualToken = prop.GetValue(subject, null) as string;
break;
}
}
return base.Localize(actualToken);
}
}
public class ReflectionBasedLocalizer : ResourceBasedLocalizer
{
public ReflectionBasedLocalizer(LocalizeStrategy strategy)
: base(strategy)
{
}
public override string Localize(ILocalizable subject, string token)
{
string actualToken = token;
PropertyInfo prop = subject.GetType().GetProperty(token);
if (prop != null)
actualToken = prop.GetValue(subject, null) as string;
return base.Localize(actualToken);
}
}
public interface ILocalizable
{
}
public abstract class Vehicle : ILocalizable
{
[Localized("Vehicle.Kind")]
public abstract string Kind { get; }
}
public class Car : Vehicle
{
private string _kind = String.Empty;
private string _colour = String.Empty;
public Car(string kind)
{
_kind = kind;
}
public override string Kind { get { return _kind; } }
[Localized("Car.Colour")]
public virtual string Colour { get { return _colour; } set { _colour = value; } }
}
public sealed class ContextFree : LocalizeStrategy
{
public static readonly ILocalizer NullLocalizer = new NullLocalizer(null);
public static readonly ILocalizer ResourceBasedLocalizer = new ResourceBasedLocalizer(null);
public override ILocalizer GetLocalizer(params object[] args)
{
if (args.Length < 1)
return NullLocalizer;
string key = args[0] as string;
switch (key)
{
case "resx":
return ResourceBasedLocalizer;
default:
return NullLocalizer;
}
}
}
public sealed class ByType : LocalizeStrategy
{
private Dictionary<Type, ILocalizer> _localizers = new Dictionary<Type, ILocalizer>();
public ByType()
{
_localizers.Add(typeof(Vehicle), new VehicleLocalizer(this));
}
public override ILocalizer GetLocalizer(params object[] args)
{
ILocalizer localizer = null;
foreach(Type type in _localizers.Keys)
if (type.IsInstanceOfType(args[0]))
{
localizer = _localizers[type];
break;
}
return localizer;
}
}
public sealed class ByAttribute : LocalizeStrategy
{
private static AttributeBasedLocalizer _localizer = null;
public override ILocalizer GetLocalizer(params object[] args)
{
if (_localizer == null)
_localizer = new AttributeBasedLocalizer(this);
return _localizer;
}
}
public sealed class ByReflection : LocalizeStrategy
{
private static ReflectionBasedLocalizer _localizer = null;
public override ILocalizer GetLocalizer(params object[] args)
{
if (_localizer == null)
_localizer = new ReflectionBasedLocalizer(this);
return _localizer;
}
}
class Program
{
private static string Localized(string token, bool doLocalize)
{
ILocalizer localizer = LocalizeStrategy.GetInstance<ContextFree>().GetLocalizer(doLocalize ? "resx" : "null");
return localizer.Localize(token);
}
private static string Localized(string token)
{
return Localized(token, true);
}
private static string NonLocalized(string token)
{
return Localized(token, false);
}
private static string Localized<S>(ILocalizable context, string token) where S : LocalizeStrategy
{
ILocalizer localizer = LocalizeStrategy.GetInstance<S>().GetLocalizer(context);
return localizer.Localize(context, token);
}
private static string Adjectivate(string adjective, string noun, bool prepend)
{
if (prepend)
return String.Concat(adjective, " ", noun);
else
return String.Concat(noun, " ", adjective);
}
private static void ApplyStrategiesOnCar(Car car)
{
bool englishMode = (String.Compare(Thread.CurrentThread.CurrentCulture.TwoLetterISOLanguageName, "en", true) == 0);
Console.WriteLine("{0} {1}.", NonLocalized("This_is_a"), Adjectivate(NonLocalized(car.Colour), NonLocalized(car.Kind), englishMode));
Console.WriteLine("{0} {1}.", Localized("This_is_a"), Adjectivate(Localized<ByType>(car, car.Colour), Localized<ByType>(car, car.Kind), englishMode));
Console.WriteLine("{0} {1}.", Localized("This_is_a"), Adjectivate(Localized<ByAttribute>(car, "Car.Colour"), Localized<ByAttribute>(car, "Vehicle.Kind"), englishMode));
Console.WriteLine("{0} {1}.", Localized("This_is_a"), Adjectivate(Localized<ByReflection>(car, "Colour"), Localized<ByReflection>(car, "Kind"), englishMode));
}
static void Main(string[] args)
{
Car car = new Car("UtilityCar");
car.Colour = "Blue";
ApplyStrategiesOnCar(car);
Console.WriteLine();
Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
ApplyStrategiesOnCar(car);
Console.WriteLine();
car = new Car("SportsCar");
car.Colour = "Red";
ApplyStrategiesOnCar(car);
Console.ReadLine();
}
}
} |
