/// <summary>
/// Converts the specified object into a instance that implements <see cref="IList"/>.
/// </summary>
/// <param name="list"></param>
/// <returns></returns>
protected internal override IList ConvertToList(ModelReferenceProperty property, object list)
{
if (list == null)
{
return(null);
}
if (list is IList)
{
return((IList)list);
}
if (list is IListSource)
{
return(((IListSource)list).GetList());
}
if (property is ReflectionReferenceProperty)
{
return(null);
}
// Add ICollection<T> support
throw new NotSupportedException("Unable to convert the specified list instance into a valid IList implementation.");
}
public ModelListChangeEvent(ModelInstance instance, ModelReferenceProperty property, IEnumerable <ModelInstance> added, IEnumerable <ModelInstance> removed)
: base(instance)
{
this.Property = property;
this.Added = added.ToArray();
this.AddedIds = this.Added.Select(i => i.Id).ToArray();
this.Removed = removed.ToArray();
this.RemovedIds = this.Removed.Select(i => i.Id).ToArray();
}
public ModelListChangeEvent(ModelInstance instance, ModelReferenceProperty property, IEnumerable<ModelInstance> added, IEnumerable<ModelInstance> removed)
: base(instance)
{
this.Property = property;
this.Added = added.ToArray();
this.AddedIds = this.Added.Select(i => i.Id).ToArray();
this.Removed = removed.ToArray();
this.RemovedIds = this.Removed.Select(i => i.Id).ToArray();
}
internal void Destroy()
{
// Remove reference from parent and child instances
@in.RemoveReference(this);
// Clear field references
this.property = null;
this.@in = null;
this.@out = null;
}
public IModelPropertySource GetSource(ModelInstance root, Func <ModelInstance, ModelReferenceProperty, int, bool> whenNull, Action <ModelInstance, ModelReferenceProperty, int, ModelInstance> whenNotNull)
{
// Return the source type for static paths
if (IsStatic)
{
return(ModelContext.Current.GetModelType(SourceType));
}
//walk the path performing whenNull if an entity is null
//if an entity is null and whenNull returns false
//then exit out of SetValue returning false
foreach (SourceStep step in this.steps.Take(this.steps.Length - 1))
{
ModelReferenceProperty stepProp = (ModelReferenceProperty)step.DeclaringType.Properties[step.Property];
if (stepProp.IsList)
{
ModelInstanceList list = root.GetList(stepProp);
if (list.Count < step.Index + 1 && (whenNull == null || !whenNull(root, stepProp, step.Index)))
{
return(null);
}
var item = list[step.Index];
if (whenNotNull != null)
{
whenNotNull(root, stepProp, step.Index, item);
}
root = item;
}
else
{
if (root.GetReference(stepProp) == null && (whenNull == null || !whenNull(root, stepProp, step.Index)))
{
return(null);
}
else
{
//advance to the next step in the chain.
var child = root.GetReference(step.Property);
if (whenNotNull != null)
{
whenNotNull(root, stepProp, step.Index, child);
}
root = child;
}
}
}
return(root);
}
/// <summary>
/// Creates a new <see cref="ModelReference"/> linking two instances through the specified property.
/// </summary>
/// <param name="property"></param>
/// <param name="in"></param>
/// <param name="out"></param>
internal ModelReference(ModelReferenceProperty property, ModelInstance @in, ModelInstance @out)
{
this.property = property;
this.@in = @in;
this.@out = @out;
}
/// <summary>
/// Ensure the destination instance path is valid when nulls are encountered along the path.
/// </summary>
/// <param name="instance"></param>
/// <param name="property"></param>
/// <param name="index"></param>
bool EnsureDestinationInstance(ModelInstance instance, ModelReferenceProperty property, int index)
{
if (property.IsList)
{
ModelInstanceList list = instance.GetList(property);
for (int i = list.Count; i <= index; i++)
list.Add(property.PropertyType.Create());
}
else
instance.SetReference(property, property.PropertyType.Create());
return true;
}
public ListChangeEventAdapter(ModelInstance instance, ModelReferenceProperty property, INotifyCollectionChanged list)
{
this.instance = instance;
this.property = property;
this.list = list;
}
protected internal override void OnStopTrackingList(ModelInstance instance, ModelReferenceProperty property, IList list)
{
if (list is INotifyCollectionChanged)
{
(new ListChangeEventAdapter(instance, property, (INotifyCollectionChanged)list)).Stop();
}
else
{
base.OnStartTrackingList(instance, property, list);
}
}
protected internal override void OnStopTrackingList(ModelInstance instance, ModelReferenceProperty property, IList list)
{
Provider.GetBaseType().OnStopTrackingList(instance, property, list);
}
protected internal override IList ConvertToList(ModelReferenceProperty property, object list)
{
return(BaseType.ConvertToList(property, list));
}
/// <summary>
/// Gets the serializable representation of a <see cref="ModelInstance"/>.
/// </summary>
/// <param name="property"></param>
/// <param name="instance"></param>
/// <returns></returns>
internal static object GetReference(ModelReferenceProperty property, ModelInstance instance)
{
if (instance == null)
return null;
else if (instance.Type != property.PropertyType)
return new { id = instance.Id, type = JsonConverter.GetJsonReferenceType(instance.Type) };
else
return instance.Id;
}
protected internal override void OnStopTrackingList(ModelInstance instance, ModelReferenceProperty property, IList list)
{
Provider.GetBaseType().OnStopTrackingList(instance, property, list);
}
protected internal override IList ConvertToList(ModelReferenceProperty property, object list)
{
return BaseType.ConvertToList(property, list);
}
internal ModelInstanceList(ModelInstance owner, ModelReferenceProperty property)
{
this.owner = owner;
this.property = property;
}
