Xtensive.Orm.Localization 7.0.5

Xtensive.Orm.Localization

Summary

The extension transparently solves a task of application or service localization. This implies that localizable resources are a part of domain model so they are stored in database.

Prerequisites

DataObjects.Net 7.0.x or later (http://dataobjects.net)

Implementation

Implement ILocalizable<TLocalization> on your localizable entities, e.g.:

  [HierarchyRoot]
  public class Page : Entity, ILocalizable<PageLocalization>
  {
    [Field, Key]
    public int Id { get; private set; }

    // Localizable field. Note that it is non-persistent
    public string Title
    {
      get { return Localizations.Current.Title; }
      set { Localizations.Current.Title = value; }
    }

    [Field] // This is a storage of all localizations for Page class
    public LocalizationSet<PageLocalization> Localizations { get; private set; }

    public Page(Session session) : base(session) {}
  }

Define corresponding localizations, e.g.:

  [HierarchyRoot]
  public class PageLocalization : Localization<Page>
  {
    [Field(Length = 100)]
    public string Title { get; set; }

    public PageLocalization(Session session, CultureInfo culture, Page target)
      : base(session, culture, target) {}
  }

Examples of usage

Example #1. Access localizable properties as regular ones, e.g.:

  page.Title = "Welcome";
  string title = page.Title;

Example #2. Mass editing of localizable properties:

  var en = new CultureInfo("en-US");
  var sp = new CultureInfo("es-ES");
  var page = new Page(session);
  page.Localizations[en].Title = "Welcome";
  page.Localizations[sp].Title = "Bienvenido";

Example #3. Value of localizable properties reflects culture of the current Thread, e.g.:

  Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
  string title = page.Title; // title is "Welcome"

  Thread.CurrentThread.CurrentCulture = new CultureInfo("es-ES");
  string title = page.Title; // title is "Bienvenido"

Example #4. Instead of altering CurrentThread, instance of LocalizationScope can be used, e.g.:

  using (new LocalizationScope(new CultureInfo("en-US"))) {
    string title = page.Title; // title is "Welcome"
  }

  using (new LocalizationScope(new CultureInfo("es-ES"))) {
    string title = page.Title; // title is "Bienvenido"
  }

Example #5. LINQ queries that include localizable properties are transparently translated

  Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
  var query = from p in session.Query.All<Page>()
    where p.Title=="Welcome"
    select p;
  Assert.AreEqual(1, query.Count());

  Thread.CurrentThread.CurrentCulture = new CultureInfo("es-ES");
  var query = from p in session.Query.All<Page>()
    where p.Title=="Bienvenido"
    select p;
  Assert.AreEqual(1, query.Count());