private void Update(object newValue, NodeIndex index, bool sendNotification)
{
if (index == NodeIndex.Empty)
{
throw new ArgumentException("index cannot be empty.");
}
var oldValue = Retrieve(index);
ItemChangeEventArgs itemArgs = null;
if (sendNotification)
{
itemArgs = new ItemChangeEventArgs(this, index, ContentChangeType.CollectionUpdate, oldValue, newValue);
NotifyItemChanging(itemArgs);
}
var collectionDescriptor = Descriptor as CollectionDescriptor;
var dictionaryDescriptor = Descriptor as DictionaryDescriptor;
if (collectionDescriptor != null)
{
collectionDescriptor.SetValue(Value, index.Int, newValue);
}
else if (dictionaryDescriptor != null)
{
dictionaryDescriptor.SetValue(Value, index.Value, newValue);
}
else
{
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
UpdateReferences();
if (sendNotification)
{
NotifyItemChanged(itemArgs);
}
}
/// <summary> /// Updates this content from one of its member. /// </summary> /// <param name="newValue">The new value for this content.</param> /// <param name="index">new index of the value to update.</param> /// <remarks> /// This method is intended to update a boxed content when one of its member changes. /// It allows to properly update boxed structs. /// </remarks> protected internal abstract void UpdateFromMember(object newValue, NodeIndex index);
/// <inheritdoc/>
public virtual object Retrieve(NodeIndex index)
{
return(Content.Retrieve(Value, index, Descriptor));
}
/// <inheritdoc/>
public void Update(object newValue, NodeIndex index)
{
Update(newValue, index, true);
}
/// <summary>
/// Indicates whether the target node of the item corresponding to the given index in the collection contained in the given node should be visited or not.
/// </summary>
/// <param name="collectionNode">The node to evaluate.</param>
/// <param name="index">The index of the item to evaluate.</param>
/// <returns>True if the node of the item corresponding to the given index in the collection contained in the given node should be visited, false otherwise.</returns>
/// <remarks>This method is invoked only when the given <see cref="IObjectNode"/> contains a collection with items being references.</remarks>
protected internal virtual bool ShouldVisitTargetItem([NotNull] IObjectNode collectionNode, NodeIndex index)
{
if (collectionNode == null)
{
throw new ArgumentNullException(nameof(collectionNode));
}
var target = collectionNode.IndexedTarget(index);
return(!visitedNodes.Contains(target));
}
public static GraphNodePath From(IGraphNode root, [NotNull] MemberPath memberPath, out NodeIndex index)
{
if (memberPath == null)
{
throw new ArgumentNullException(nameof(memberPath));
}
var result = new GraphNodePath(root);
index = NodeIndex.Empty;
var memberPathItems = memberPath.Decompose();
for (int i = 0; i < memberPathItems.Count; i++)
{
var memberPathItem = memberPathItems[i];
bool lastItem = i == memberPathItems.Count - 1;
if (memberPathItem.MemberDescriptor != null)
{
result.PushMember(memberPathItem.MemberDescriptor.Name);
}
else if (memberPathItem.GetIndex() != null)
{
var localIndex = new NodeIndex(memberPathItem.GetIndex());
if (lastItem)
{
// If last item, we directly return the index rather than add it to the path
index = localIndex;
}
else
{
result.PushIndex(localIndex);
}
}
// Don't apply Target on last item
if (!lastItem)
{
// If this is a reference, add a target element to the path
var node = result.GetNode();
var objectReference = (node as IMemberNode)?.TargetReference;
if (objectReference?.TargetNode != null)
{
result.PushTarget();
}
}
}
return(result);
}
public static NodePathElement CreateIndex(NodeIndex index)
{
return(new NodePathElement(index));
}
protected virtual bool ShouldVisitTargetItem(IObjectNode collectionNode, NodeIndex index)
{
return(true);
}
public void PushIndex(NodeIndex index) => PushElement(index, ElementType.Index);
protected internal override bool ShouldVisitTargetItem(IObjectNode collectionNode, NodeIndex index)
{
return(linker.ShouldVisitTargetItem(collectionNode, index) && base.ShouldVisitTargetItem(collectionNode, index));
}
internal void SetOwnerContent(IGraphNode ownerNode, NodeIndex index)
{
boxedStructureOwner = (GraphNodeBase)ownerNode;
boxedStructureOwnerIndex = index;
}
protected internal override void UpdateFromMember(object newValue, NodeIndex index)
{
Update(newValue, index, true);
}
internal DynamicIndexedNode(IGraphNode node, NodeIndex index)
: base(node)
{
this.index = index;
}
protected static bool UpdateCollection([NotNull] IObjectNode node, object value, NodeIndex index)
{
if (IsIndexExisting(node, index))
{
node.Update(value, index);
return(true);
}
if (IsIndexValid(node, index))
{
node.Add(value, index);
return(true);
}
return(false);
}
