/// <summary>
/// Initializes the delegates that are used to check and accept changes for properties.
/// </summary>
public void PrepareChangeTracking()
{
if (_helper == null)
{
_helper = ChangeTrackingFactory.CreateExtendedBoxedHelper(this);
}
}
/// <summary>
/// Creates an extended boxed helper containing a delegate that will check any of the properties that implement IChangeTracking if they have changed,
/// a delegate that will accept changes for those properties
/// and a method call to make the properties stop listening for changes.
/// </summary>
/// <param name="item">The item.</param>
/// <returns></returns>
public static ExtendedChangeTrackingHelper <object> CreateExtendedBoxedHelper(object item)
{
var type = item.GetType();
var cache = ExtendedBoxedCache;
ExtendedChangeTrackingHelper <object> helper;
if (cache.TryGetValue(type, out helper))
{
return(helper);
}
var properties = GetRelevantProperties(type);
var hasChanges = BoxedHasChangesFor(type, properties);
var acceptChanges = BoxedAcceptChangesFor(type, properties);
var stopChangeTracking = BoxedStopChangeTrackingFor(type, properties);
var changeTrackingHelper = new ExtendedChangeTrackingHelper <object>(hasChanges, acceptChanges, stopChangeTracking);
cache.Add(type, changeTrackingHelper);
return(changeTrackingHelper);
}
/// <summary>
/// Creates an extended helper containing a delegate that will check any of the properties that implement IChangeTracking if they have changed,
/// a delegate that will accept changes for those properties
/// and a method call to make the properties stop listening for changes.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="item">The item.</param>
/// <returns></returns>
public static ExtendedChangeTrackingHelper <T> CreateExtendedHelper <T>(T item)
{
var type = item.GetType();
var cache = ExtendedCache;
object helper;
if (cache.TryGetValue(type, out helper))
{
return((ExtendedChangeTrackingHelper <T>)helper);
}
var properties = GetRelevantProperties(type);
var hasChanges = HasChangesFor <T>(type, properties);
var acceptChanges = AcceptChangesFor <T>(type, properties);
var stopChangeTracking = StopChangeTrackingFor <T>(type, properties);
var changeTrackingHelper = new ExtendedChangeTrackingHelper <T>(hasChanges, acceptChanges, stopChangeTracking);
cache.Add(type, changeTrackingHelper);
return(changeTrackingHelper);
}