internal static void VerifyCollectionIsNotNull(IDirectedConnectedNodeCollection <T> collection)
{
if (collection == null)
{
throw new ArgumentNullException("collection", "Operation is not valid on a null set of nodes.");
}
}
void IDirectedConnectedNode <T> .AddToCollection(IDirectedConnectedNodeCollection <T> newParentCollection)
{
Helpers <T> .Verify_AddToCollection_ConditionsAreSatisfied(this, newParentCollection);
var typedCollection = TypedHelpers.GetCollectionAsValidType <PointerDCNC <T>, T>(newParentCollection);
typedCollection.InternalAddNodeRequest(this);
this.InternalSetParentCollectionRequest(typedCollection);
}
internal static void VerifyAtLeastOneNodeIsInCollection(
IDirectedConnectedNode <T> firstNode,
IDirectedConnectedNode <T> secondNode,
IDirectedConnectedNodeCollection <T> collection)
{
if (NodeIsNotInCollection(firstNode, collection) && NodeIsNotInCollection(secondNode, collection))
{
throw new InvalidOperationException("Cannot report on connection between two nodes not in collection.");
}
}
public void InputOfWrongTypeThrows()
{
var arrayCollection = IDCNCFactory.NewArrayCollection <int>();
IDirectedConnectedNodeCollection <int> deTypedArrayCollection = arrayCollection;
Assert.Throws <InvalidCastException>(
() => TypedHelpers.GetCollectionAsValidType <PointerDCNC <int>, int>(deTypedArrayCollection));
var pointerCollection = IDCNCFactory.NewPointerCollection <string>();
IDirectedConnectedNodeCollection <string> deTypedPointerCollection = pointerCollection;
Assert.Throws <InvalidCastException>(
() => TypedHelpers.GetCollectionAsValidType <ArrayDCNC <string>, string>(deTypedPointerCollection));
}
public void OutputIsOfExpectedType()
{
var arrayCollection = IDCNCFactory.NewArrayCollection <int>();
IDirectedConnectedNodeCollection <int> deTypedArrayCollection = arrayCollection;
var hopefullyArrayOutput = TypedHelpers.GetCollectionAsValidType <ArrayDCNC <int>, int>(deTypedArrayCollection);
Assert.IsTrue(hopefullyArrayOutput is ArrayDCNC <int>);
var pointerCollection = IDCNCFactory.NewPointerCollection <string>();
IDirectedConnectedNodeCollection <string> deTypedPointerCollection = pointerCollection;
var hopefullyPointerOutput = TypedHelpers.GetCollectionAsValidType <PointerDCNC <string>, string>(deTypedPointerCollection);
Assert.IsTrue(hopefullyPointerOutput is PointerDCNC <string>);
}
internal static S GetCollectionAsValidType <S, T>(IDirectedConnectedNodeCollection <T> collection) where S : class, IDirectedConnectedNodeCollection <T>
{
if (collection == null)
{
return(null);
}
var typedCollection = collection as S;
if (typedCollection == null)
{
throw new InvalidCastException($"Given collection is not a '{typeof(S)}' collection. Collection Type is actually: '{collection.GetType()}'");
}
return(typedCollection);
}
private static bool NodeIsNotInCollection(IDirectedConnectedNode <T> node, IDirectedConnectedNodeCollection <T> collection)
{
return(node.ParentCollection != collection);
}
internal static void VerifyNodeIsInCollection(IDirectedConnectedNode <T> node, IDirectedConnectedNodeCollection <T> collection)
{
if (NodeIsNotInCollection(node, collection))
{
throw new InvalidOperationException("Operation is not valid on a node in a different Collection.");
}
}
internal static bool CheckNodesHaveConnectionConditions(IDirectedConnectedNode <T> firstNode, IDirectedConnectedNode <T> secondNode, IDirectedConnectedNodeCollection <T> collection)
{
if (firstNode == null || secondNode == null)
{
return(true);
}
VerifyAtLeastOneNodeIsInCollection(firstNode, secondNode, collection);
if (NodeIsNotInCollection(firstNode, collection) || NodeIsNotInCollection(secondNode, collection))
{
return(true);
}
return(false);
}
internal static bool CheckWhether_RemoveNode_IsNeeded(IDirectedConnectedNode <T> node, IDirectedConnectedNodeCollection <T> collection)
{
return(node == null || NodeIsNotInCollection(node, collection));
}
internal static void Verify_AddToCollection_ConditionsAreSatisfied(IDirectedConnectedNode <T> node, IDirectedConnectedNodeCollection <T> collection)
{
VerifyCollectionIsNotNull(collection);
VerifyNodeIsNotInAnyCollection(node);
}
internal static void Verify_ConnectNodes_ConditionsAreSatisfied(IDirectedConnectedNode <T> firstNode, IDirectedConnectedNode <T> secondNode, IDirectedConnectedNodeCollection <T> collection)
{
VerifyNodeIsNotNull(firstNode);
VerifyNodeIsNotNull(secondNode);
VerifyNodeIsInCollection(firstNode, collection);
VerifyNodeIsInCollection(secondNode, collection);
VerifyNodesAreNotTheSameNode(firstNode, secondNode);
}
internal static void Verify_GetNodesConnected_ConditionsAreSatisfied(IDirectedConnectedNode <T> node, IDirectedConnectedNodeCollection <T> collection)
{
VerifyNodeIsNotNull(node);
VerifyNodeIsInCollection(node, collection);
}