private GraphNodePath PushElement(object elementValue, ElementType type)
{
var result = Clone(RootNode, false);
switch (type)
{
case ElementType.Member:
var name = elementValue as string;
if (name == null)
{
throw new ArgumentException("The value must be a non-null string when type is ElementType.Member.");
}
result.path.Add(NodePathElement.CreateMember(name));
return(result);
case ElementType.Target:
if (elementValue != null)
{
throw new ArgumentException("The value must be null when type is ElementType.Target.");
}
result.path.Add(NodePathElement.CreateTarget());
return(result);
case ElementType.Index:
if (!(elementValue is Index))
{
throw new ArgumentException("The value must be an Index when type is ElementType.Index.");
}
result.path.Add(NodePathElement.CreateIndex((Index)elementValue));
return(result);
default:
throw new ArgumentOutOfRangeException(nameof(type));
}
}
private void PushElement(object elementValue, ElementType type)
{
switch (type)
{
case ElementType.Member:
var name = elementValue as string;
if (name == null)
{
throw new ArgumentException("The value must be a non-null string when type is ElementType.Member.");
}
path.Add(NodePathElement.CreateMember(name));
break;
case ElementType.Target:
if (elementValue != null)
{
throw new ArgumentException("The value must be null when type is ElementType.Target.");
}
path.Add(NodePathElement.CreateTarget());
break;
case ElementType.Index:
if (!(elementValue is NodeIndex))
{
throw new ArgumentException("The value must be an Index when type is ElementType.Index.");
}
path.Add(NodePathElement.CreateIndex((NodeIndex)elementValue));
break;
default:
throw new ArgumentOutOfRangeException(nameof(type));
}
}