/// <summary>
/// Makes the context having the given id the current one.
/// If it doesn't exist, it is created.
/// </summary>
/// <param name="pNewContextId">The new context id.</param>
/// <returns>The new current context.</returns>
public IUserCommandContext SwitchContext(string pNewContextId)
{
if (this.CurrentContext != null && this.CurrentContext.Id == pNewContextId)
{
return(this.CurrentContext);
}
IUserCommandContext lOldContext = this.CurrentContext;
IUserCommandContext lNewContext = this.GetContextById(pNewContextId);
if (lNewContext == null)
{
lNewContext = this.CreateContext(pNewContextId);
}
if (lNewContext == null)
{
// Do not change for a null context.
return(this.CurrentContext);
}
else
{
// Notifying the modification and updating the current context.
this.CurrentContext = lNewContext;
if (this.ContextChanged != null)
{
this.ContextChanged(this, new ContextChangedEventArgs(this, lOldContext, lNewContext));
}
return(this.CurrentContext);
}
}
/// <summary>
/// Creates a context with the given id.
/// </summary>
/// <param name="pId">The id of the new context.</param>
/// <returns>The new context if a context having the same id does not have the same id, null otherwise.</returns>
private IUserCommandContext CreateContext(string pId)
{
if (this.mContextes.ContainsKey(pId) == false)
{
IUserCommandContext lContext = this.CustomCreateContext(pId);
if (lContext != null)
{
this.mContextes[pId] = lContext;
return(lContext);
}
}
return(null);
}
/// <summary>
/// Initializes a new instance of the <see cref="ContextChangedEventArgs"/> class.
/// </summary>
/// <param name="pSession">The parent session.</param>
/// <param name="pOldContext">The old context.</param>
/// <param name="pNewContext">The new context.</param>
public ContextChangedEventArgs(IUserCommandSession pSession, IUserCommandContext pOldContext, IUserCommandContext pNewContext)
{
this.Session = pSession;
this.OldContext = pOldContext;
this.NewContext = pNewContext;
}