protected override void ExecuteSync(IContentNode content, Index index, object parameter)
{
var value = content.Retrieve(index);
var collectionDescriptor = (CollectionDescriptor)TypeDescriptorFactory.Default.Find(value.GetType());
object itemToAdd;
// First, check if parameter is an AbstractNodeEntry
var abstractNodeEntry = parameter as AbstractNodeEntry;
if (abstractNodeEntry != null)
{
itemToAdd = abstractNodeEntry.GenerateValue(null);
}
// Otherwise, assume it's an object
else
{
var elementType = collectionDescriptor.ElementType;
itemToAdd = parameter ?? (IsReferenceType(elementType) ? null : ObjectFactoryRegistry.NewInstance(elementType));
}
if (index.IsEmpty)
{
content.Add(itemToAdd);
}
else
{
// Handle collections in collections
// TODO: this is not working on the observable node side
var collectionNode = content.ItemReferences[index].TargetNode;
collectionNode.Add(itemToAdd);
}
}
protected override ObjectReference FindTargetReference(IContentNode sourceNode, IContentNode targetNode, ObjectReference sourceReference)
{
if (sourceReference.Index.IsEmpty)
{
return(targetNode.TargetReference);
}
// Special case for objects that are identifiable: the object must be linked to the base only if it has the same id
if (sourceReference.ObjectValue != null)
{
if (sourceReference.Index.IsEmpty)
{
return(targetNode.TargetReference);
}
var sourceAssetNode = (IAssetNode)sourceNode;
if ((sourceAssetNode as AssetMemberNode)?.IsNonIdentifiableCollectionContent ?? false)
{
return(null);
}
// Enumerable reference: we look for an object with the same id
var targetReference = targetNode.ItemReferences;
var sourceIds = CollectionItemIdHelper.GetCollectionItemIds(sourceNode.Retrieve());
var targetIds = CollectionItemIdHelper.GetCollectionItemIds(targetNode.Retrieve());
var itemId = sourceIds[sourceReference.Index.Value];
var targetKey = targetIds.GetKey(itemId);
return(targetReference.FirstOrDefault(x => Equals(x.Index.Value, targetKey)));
}
// Not identifiable - default applies
return(base.FindTargetReference(sourceNode, targetNode, sourceReference));
}
internal void Refresh(IContentNode ownerNode, NodeContainer nodeContainer, Index index)
{
var objectValue = ownerNode.Retrieve(index);
var boxedTarget = TargetNode as BoxedContent;
if (boxedTarget != null && objectValue?.GetType() == TargetNode.Type)
{
// If we are boxing a struct, and the targeted type didn't change, we reuse the same nodes and just overwrite the struct value.
boxedTarget.UpdateFromOwner(objectValue);
// But we still need to refresh inner references!
foreach (var member in TargetNode.Members.Where(x => x.IsReference))
{
nodeContainer?.UpdateReferences(member);
}
}
else if (TargetNode?.Value != objectValue)
{
// This call will recursively update the references.
var target = SetTarget(objectValue, nodeContainer);
if (target != null)
{
var boxedContent = target as BoxedContent;
boxedContent?.SetOwnerContent(ownerNode, index);
}
}
// This reference is not orphan anymore.
orphanObject = null;
}
/// <summary>
/// Tests the validity of a node that is a member of an object.
/// </summary>
/// <param name="containerNode">The node of the container of this member.</param>
/// <param name="memberNode">The memeber node to validate.</param>
/// <param name="container">The value represented by the container node.</param>
/// <param name="member">The value of the member represented by the member node.</param>
/// <param name="memberName">The name of the member to validate.</param>
/// <param name="isReference">Indicate whether the member node is expected to contain a reference to the value it represents.</param>
public static void TestMemberNode(IContentNode containerNode, IContentNode memberNode, object container, object member, string memberName, bool isReference)
{
if (containerNode == null)
{
throw new ArgumentNullException(nameof(containerNode));
}
if (memberNode == null)
{
throw new ArgumentNullException(nameof(memberNode));
}
if (container == null)
{
throw new ArgumentNullException(nameof(container));
}
// Check that the content is of the expected type.
Assert.AreEqual(typeof(MemberContent), memberNode.GetType());
// A node with a MemberContent should have the same name that the member in the container.
Assert.AreEqual(memberName, ((IMemberNode)memberNode).Name);
// A node with a MemberContent should have its container as parent.
Assert.AreEqual(containerNode, ((IMemberNode)memberNode).Parent);
// A node with a MemberContent should have the member value as value of its content.
Assert.AreEqual(member, memberNode.Retrieve());
// A node with a primitive MemberContent should not contain a reference.
Assert.AreEqual(isReference, memberNode.IsReference);
}
/// <summary>
/// Tests the validity of a node that is an object that is a collection
/// </summary>
/// <param name="node">The node to validate.</param>
/// <param name="obj">The value represented by this node.</param>
/// <param name="isReference">Indicate whether the node is expected to contain an enumerable reference to the collection items.</param>
public static void TestCollectionObjectContentNode(IContentNode node, object obj, bool isReference)
{
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
// Check that the content is of the expected type.
Assert.IsInstanceOf <ObjectContent>(node);
// A node with an ObjectContent should have the related object as value of its content.
Assert.AreEqual(obj, node.Retrieve());
if (isReference)
{
// A node with an ObjectContent representing a collection of reference types should contain an enumerable reference.
Assert.AreEqual(true, node.IsReference);
Assert.Null(node.TargetReference);
Assert.NotNull(node.ItemReferences);
}
else
{
// A node with an ObjectContent representing a collection of primitive or struct types should not contain a refernce.
Assert.AreEqual(false, node.IsReference);
}
// A node with an ObjectContent representing a collection should not have any child.
Assert.AreEqual(0, ((IObjectNode)node).Members.Count);
}
protected static bool IsIndexExisting(IContentNode node, Index index)
{
if (node.IsReference)
{
var reference = node.ItemReferences;
if (reference?.HasIndex(index) ?? false)
{
return(true);
}
}
else
{
var value = node.Retrieve();
var collectionDescriptor = node.Descriptor as CollectionDescriptor;
if (collectionDescriptor != null && index.IsInt && index.Int >= 0 && index.Int < collectionDescriptor.GetCollectionCount(value))
{
return(true);
}
var dictionaryDescriptor = node.Descriptor as DictionaryDescriptor;
if (dictionaryDescriptor != null && dictionaryDescriptor.KeyType.IsInstanceOfType(index.Value) && dictionaryDescriptor.ContainsKey(value, index.Value))
{
return(true);
}
}
return(false);
}
private static void AssertCollection(IContentNode content, params string[] items)
{
for (var i = 0; i < items.Length; i++)
{
var item = items[i];
Assert.AreEqual(item, content.Retrieve(new Index(i)));
}
}
protected override void ExecuteSync(IContentNode content, Index index, object parameter)
{
var indices = (Tuple <int, int>)parameter;
var sourceIndex = new Index(indices.Item1);
var targetIndex = new Index(indices.Item2);
var value = content.Retrieve(sourceIndex);
content.Remove(value, sourceIndex);
content.Add(value, targetIndex);
}
protected override void ExecuteSync(IContentNode content, Index index, object parameter)
{
var oldName = index;
var renamedObject = content.Retrieve(oldName);
content.Remove(renamedObject, oldName);
var newName = AddPrimitiveKeyCommand.GenerateStringKey(content.Value, content.Descriptor, (string)parameter);
content.Add(renamedObject, newName);
}
/// <summary>
/// Sets the value of the model content associated to this <see cref="GraphNodeViewModel"/>. The value is actually modified only if the new value is different from the previous value.
/// </summary>
/// <returns><c>True</c> if the value has been modified, <c>false</c> otherwise.</returns>
protected virtual bool SetModelContentValue(IContentNode node, object newValue)
{
var oldValue = node.Retrieve(Index);
if (!Equals(oldValue, newValue))
{
node.Update(newValue, Index);
return(true);
}
return(false);
}
protected override void ExecuteSync(IContentNode content, Index index, object parameter)
{
var value = content.Retrieve(index);
var dictionaryDescriptor = (DictionaryDescriptor)TypeDescriptorFactory.Default.Find(value.GetType());
var newKey = dictionaryDescriptor.KeyType != typeof(string) ? new Index(Activator.CreateInstance(dictionaryDescriptor.KeyType)) : GenerateStringKey(value, dictionaryDescriptor, parameter as string);
object newItem = null;
if (!IsReferenceType(dictionaryDescriptor.ValueType))
{
newItem = CreateInstance(dictionaryDescriptor.ValueType);
}
content.Add(newItem, newKey);
}
private static void VerifyListenerEvent(MemberNodeChangeEventArgs e, IContentNode contentOwner, ContentChangeType type, Index index, object oldValue, object newValue, bool changeApplied)
{
Assert.NotNull(e);
Assert.NotNull(contentOwner);
Assert.AreEqual(type, e.ChangeType);
Assert.AreEqual(contentOwner, e.Member);
Assert.AreEqual(index, e.Index);
Assert.AreEqual(newValue, e.NewValue);
Assert.AreEqual(oldValue, e.OldValue);
if (type == ContentChangeType.ValueChange)
{
Assert.AreEqual(changeApplied ? newValue : oldValue, contentOwner.Retrieve(index));
}
}
public override Task Execute(IContentNode content, Index index, object parameter)
{
var hasIndex = content.Indices == null || content.Indices.Contains(index);
var currentValue = hasIndex ? content.Retrieve(index) : (content.Type.IsValueType ? Activator.CreateInstance(content.Type) : null);
var newValue = ChangeValue(currentValue, parameter);
if (hasIndex)
{
if (!Equals(newValue, currentValue))
{
content.Update(newValue, index);
}
}
else
{
content.Add(newValue, index);
}
return(Task.FromResult(0));
}
/// <summary>
/// Tests the validity of a node that is an object that is not a collection
/// </summary>
/// <param name="node">The node to validate.</param>
/// <param name="obj">The value represented by this node.</param>
/// <param name="childCount">The number of members expected in the node.</param>
public static void TestNonCollectionObjectNode(IContentNode node, object obj, int childCount)
{
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
// Check that the content is of the expected type.
Assert.IsInstanceOf <ObjectContent>(node);
// A node with an ObjectContent should have the related object as value of its content.
Assert.AreEqual(obj, node.Retrieve());
// A node with an ObjectContent should not contain a reference if it does not represent a collection.
Assert.AreEqual(false, node.IsReference);
// Check that we have the expected number of children.
Assert.AreEqual(childCount, ((IObjectNode)node).Members.Count);
}
protected override void ExecuteSync(IContentNode content, Index index, object parameter)
{
var item = content.Retrieve(index);
content.Remove(item, index);
}
public void Refresh(IContentNode ownerNode, NodeContainer nodeContainer)
{
var newObjectValue = ownerNode.Value;
if (!(newObjectValue is IEnumerable))
{
throw new ArgumentException(@"The object is not an IEnumerable", nameof(newObjectValue));
}
ObjectValue = newObjectValue;
var newReferences = new HybridDictionary <Index, ObjectReference>();
if (IsDictionary)
{
foreach (var item in (IEnumerable)ObjectValue)
{
var key = GetKey(item);
var value = (ObjectReference)Reference.CreateReference(GetValue(item), ElementType, key);
newReferences.Add(key, value);
}
}
else
{
var i = 0;
foreach (var item in (IEnumerable)ObjectValue)
{
var key = new Index(i);
var value = (ObjectReference)Reference.CreateReference(item, ElementType, key);
newReferences.Add(key, value);
++i;
}
}
// The reference need to be updated if it has never been initialized, if the number of items is different, or if any index or any value is different.
var needUpdate = items == null || newReferences.Count != items.Count || !AreItemsEqual(items, newReferences);
if (needUpdate)
{
// We create a mapping values of the old list of references to their corresponding target node. We use a list because we can have multiple times the same target in items.
var oldReferenceMapping = new List <KeyValuePair <object, ObjectReference> >();
if (items != null)
{
var existingIndices = ContentNode.GetIndices(ownerNode).ToList();
foreach (var item in items)
{
var boxedTarget = item.Value.TargetNode as BoxedContent;
// For collection of struct, we need to update the target nodes first so equity comparer will work. Careful tho, we need to skip removed items!
if (boxedTarget != null && existingIndices.Contains(item.Key))
{
// If we are boxing a struct, we reuse the same nodes if they are type-compatible and just overwrite the struct value.
var value = ownerNode.Retrieve(item.Key);
if (value?.GetType() == item.Value.TargetNode?.Type)
{
boxedTarget.UpdateFromOwner(ownerNode.Retrieve(item.Key));
}
}
if (item.Value.ObjectValue != null)
{
oldReferenceMapping.Add(new KeyValuePair <object, ObjectReference>(item.Value.ObjectValue, item.Value));
}
}
}
foreach (var newReference in newReferences)
{
if (newReference.Value.ObjectValue != null)
{
var found = false;
var i = 0;
foreach (var item in oldReferenceMapping)
{
if (Equals(newReference.Value.ObjectValue, item.Key))
{
// If this value was already present in the old list of reference, just use the same target node in the new list.
newReference.Value.SetTarget(item.Value.TargetNode);
// Remove consumed existing reference so if there is a second entry with the same "key", it will be the other reference that will be used.
oldReferenceMapping.RemoveAt(i);
found = true;
break;
}
++i;
}
if (!found)
{
// Otherwise, do a full update that will properly initialize the new reference.
newReference.Value.Refresh(ownerNode, nodeContainer, newReference.Key);
}
}
}
items = newReferences;
// Remark: this works because both KeyCollection and List implements IReadOnlyCollection. Any internal change to HybridDictionary might break this!
Indices = (IReadOnlyCollection <Index>)newReferences.Keys;
}
}
/// <summary>
/// Retrieve the value of the model content associated to this <see cref="GraphNodeViewModel"/>.
/// </summary>
/// <returns>The value of the model content associated to this <see cref="GraphNodeViewModel"/>.</returns>
protected object GetModelContentValue()
{
return(SourceNode.Retrieve(Index));
}