/// <summary>
/// The token key, which might be a property of the <paramref name="application"/> object or an
/// application value in the application data.
/// </summary>
/// <param name="application">The application to source data from.</param>
/// <param name="token">The token key.</param>
/// <param name="path">Specifies the path to the token. Defaults to <see langword="null"/>.</param>
/// <returns>The value of the token.</returns>
/// <remarks>Order of precedence: (1) <paramref name="application"/> object; (2) application data.</remarks>
public static object GetTokenValue(this Application application, string token, ApplicationDataPath path = null)
{
object tokenValue;
if (application.TryGetPropertyValue(token, '.', out tokenValue))
{
return tokenValue;
}
// We are going to be be popping items so we should create our own copy of the path.
ApplicationDataPath pathIterator = new ApplicationDataPath(path ?? new ApplicationDataPath());
string tokenPath = pathIterator.ToString(token);
tokenValue = application.ApplicationData.GetValue<object>(tokenPath, null);
while (tokenValue == null && pathIterator.Count != 0)
{
pathIterator.TraverseUp();
tokenPath = pathIterator.ToString(token);
tokenValue = application.ApplicationData.GetValue<object>(tokenPath, null);
}
return tokenValue;
}
public void ReturnsFirstItem()
{
ApplicationDataPath path = new ApplicationDataPath();
path.Append("Foo", 42);
path.Append("Bar", 16);
ApplicationDataPathSegment segment = path.TraverseUp();
Assert.AreEqual(16, segment.Index);
}
public void LeavesObjectInCorrectState()
{
ApplicationDataPath path = new ApplicationDataPath();
path.Append("Foo", 42);
path.Append("Bar", 16);
path.TraverseUp();
Assert.AreEqual(42, path.First().Index);
}