/// <summary>
/// Get the T value(s) from the given set of Quads;
/// Returns the original items.
/// </summary>
public static IReadOnlyList <Quad> Get <T>(this IEnumerable <Quad> self,
out T[] result) where T : notnull
{
TypeMustNotBeANode.Verify <T>();
var ro = self.Ro();
result = ro.Get <T>().ToArray();
return(ro);
}
/// <summary>Quads where Object is of Type</summary>
/// <exception cref="TypeMustNotBeANode"></exception>
public static IEnumerable <Quad> IsType <T1, T2>(this IEnumerable <Quad> self,
Func <Node, bool>?orPredicate = null)
where T1 : notnull where T2 : notnull
{
TypeMustNotBeANode.Verify <T1>();
TypeMustNotBeANode.Verify <T2>();
return(self.Where(x => x.Object is Node <T1> ||
x.Object is Node <T2> ||
orPredicate != null && orPredicate(x.Object)));
}
/// <inheritdoc />
public Node <T> New <T>(T value) where T : notnull
{
TypeMustNotBeANode.Verify <T>();
//Uri not supported.
if (value is Uri)
{
throw new UriObjectNodeNotSupported();
}
//Try native object equality.
var found = _nodes
.FirstOrDefault(x =>
x is Node <T> v &&
v.Value.Equals(value));
if (found != null)
{
return((Node <T>)found);
}
//Find a Node map to use.
var nodeMap = _nodeMaps
.OfType <NodeMap <T> >()
.FirstOrDefault(x => !(x is TypedLiteralMap)) ??
AddNodeType(new ObjectNodeMap <T>());
//Create temporary.
var tempNode = nodeMap.Create(value);
//again try match
if (tempNode.ValueString != null)
{
found = _nodes
.FirstOrDefault(x =>
x.ValueType == tempNode.ValueType &&
x.ValueStringHash == tempNode.ValueStringHash &&
x.ValueString == tempNode.ValueString);
if (found != null)
{
return((Node <T>)found);
}
}
//New
_nodes.Add(tempNode);
return(tempNode);
}
/// <summary>
/// Try convert node to typed node.
/// </summary>
/// <exception cref="TypeMustNotBeANode"></exception>
public static Node <T>?As <T>(this Node node) where T : notnull
{
TypeMustNotBeANode.Verify <T>();
return(node as Node <T>);
}