public bool Check(Data data)
{
var firstArgument = _firstArgumentSelector.SelectData(data);
var secondArgument = _secondArgumentSelector.SelectData(data);
IComparer comparer = new Comparer(CultureInfo.CurrentCulture);
int compareResult = comparer.Compare(firstArgument, secondArgument);
return _checkComparisonResult(compareResult);
}
public object ExtractSingleValue(Data root, IEnumerable<string> path)
{
Contract.Requires(root != null);
Contract.Requires(path != null);
var currentNode = root;
foreach (var pathElement in path)
{
if (!(currentNode is DataNode))
return DataNotFound.Instance;
var node = (DataNode) currentNode;
var selectedNodes = node.Children.Where(c => Equals(c.Name, pathElement));
if (selectedNodes.Count() > 1)
throw new Exception("Data is ambiguous");
if (!selectedNodes.Any())
return DataNotFound.Instance;
currentNode = selectedNodes.Single();
}
if (currentNode is DataAttribute) return ((DataAttribute) currentNode).GetValue();
return currentNode;
}