public static Category Deserialize(string xml)
{
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.LoadXml(xml);
XmlElement rootElement = xmlDocument.DocumentElement;
if (rootElement == null)
{
throw new ArgumentException("Xml structure is corrupted or incorrect");
}
var nodes = rootElement.ChildNodes;
AssociativeTable <BaseElement, List <int> > table = new AssociativeTable <BaseElement, List <int> >();
foreach (XmlElement node in nodes)
{
XmlElement element = (XmlElement)node.GetElementsByTagName("Element")[0];
BaseElement baseElement = BaseElement.Deserialize(element);
List <int> childIndexList = new List <int>();
table.Add(baseElement, childIndexList);
XmlNodeList relationXmlList = node.GetElementsByTagName("relation");
foreach (XmlElement relationNode in relationXmlList)
{
string attrVal = relationNode.GetAttribute("index");
int relativeIndex = Int32.Parse(attrVal);
childIndexList.Add(relativeIndex);
}
}
// Restoring relation tree
foreach (var pair in table)
{
BaseElement baseElement = pair.Val1;
List <int> relations = pair.Val2;
if (baseElement is Category category)
{
foreach (var relationIndex in relations)
{
var relationPair = table[relationIndex];
category.Add(relationPair.Val1);
}
}
}
return(table[0].Val1 as Category);
}
public static string Serialize(Category rootCategory)
{
AssociativeTable <BaseElement, List <BaseElement> > linkTable = new AssociativeTable <BaseElement, List <BaseElement> >();
FillLinkTable(linkTable, rootCategory);
XmlDocument xmlDocument = new XmlDocument();
XmlDeclaration xmlDeclaration = xmlDocument.CreateXmlDeclaration("1.0", "UTF-8", null);
XmlElement root = xmlDocument.DocumentElement;
xmlDocument.InsertBefore(xmlDeclaration, root);
XmlElement rootElement = xmlDocument.CreateElement(string.Empty, "Owc-interactive-learning", string.Empty);
xmlDocument.AppendChild(rootElement);
int i = 0;
foreach (var element in linkTable)
{
Debug.WriteLine("Processing: " + element.Val1.Name);
XmlElement node = xmlDocument.CreateElement("node");
node.SetAttribute("index", i.ToString());
rootElement.AppendChild(node);
XmlElement serialized = element.Val1.SerializeToXml(xmlDocument);
node.AppendChild(serialized);
foreach (var relation in element.Val2)
{
XmlElement childIndexElement = xmlDocument.CreateElement("relation");
BaseElement child = relation;
int index = linkTable.GetKeyIndex(child);
childIndexElement.SetAttribute("index", index.ToString());
node.AppendChild(childIndexElement);
}
i++;
}
StringWriter stringWriter = new StringWriter();
XmlTextWriter xmlTextWriter = new XmlTextWriter(stringWriter);
xmlDocument.PreserveWhitespace = true;
xmlDocument.WriteTo(xmlTextWriter);
return(stringWriter.ToString());
}
private static void FillLinkTable(AssociativeTable <BaseElement, List <BaseElement> > linkTable, BaseElement current)
{
if (!linkTable.IsKeyInTable(current))
{
linkTable.Add(current, new List <BaseElement>());
}
if (current is Category category)
{
foreach (var child in category)
{
linkTable[current].Add(child);
FillLinkTable(linkTable, child);
}
}
}
