/// <summary>
/// Used by CompressXML
/// </summary>
/// <param name="entities">Map of attribute to entity name</param>
/// <param name="singletons">Output: List of single use attributes to 'uncompress'</param>
/// <param name="doc"></param>
/// <param name="el"></param>
/// <param name="idx">Number that is incremented to provide new entity names</param>
private static void RecCompXML(Hashtable entities, Hashtable singletons, XmlDocument doc, XmlElement el, ref int idx)
{
var keys = new ArrayList();
foreach (XmlAttribute att in el.Attributes)
{
keys.Add(att.Name);
}
foreach (string s in keys)
{
var val = el.Attributes[s].Value;
if (val.Length > 30)
{
string entname;
if (entities[val] == null)
{
idx++;
entname = "E" + idx.ToString();
entities[val] = entname;
singletons[val] = new EntitySingleton()
{
Element = el, AttributeName = s
};
}
else
{
entname = (string)entities[val];
singletons.Remove(val);
}
var attr = doc.CreateAttribute(s);
attr.AppendChild(doc.CreateEntityReference(entname));
el.SetAttributeNode(attr);
}
}
foreach (XmlNode ch in el.ChildNodes)
{
if (ch.GetType() == typeof(XmlElement))
{
RecCompXML(entities, singletons, doc, (XmlElement)ch, ref idx);
}
}
}
/// <summary>
/// Used by CompressXML
/// </summary>
/// <param name="counts">Map of attribute to number of occurrences -- could be used to improve algorithm</param>
/// <param name="entities">Map of attribute to entity name</param>
/// <param name="doc"></param>
/// <param name="el"></param>
/// <param name="idx">Number that is incremented to provide new entity names</param>
private static void RecCompXML(Hashtable entities, Hashtable singletons, XmlDocument doc, XmlElement el, ref int idx)
{
ArrayList keys = new ArrayList();
foreach(XmlAttribute att in el.Attributes)
{
keys.Add(att.Name);
}
foreach(string s in keys)
{
string val = el.Attributes[s].Value;
if (val.Length > 30)
{
string entname;
if(entities[val] == null)
{
idx += 1;
entname = "E"+idx.ToString();
entities[val] = entname;
singletons[val] = new EntitySingleton() { Element = el, AttributeName = s };
}
else
{
entname = (string)entities[val];
singletons.Remove(val);
}
XmlAttribute attr = doc.CreateAttribute(s);
attr.AppendChild(doc.CreateEntityReference(entname));
el.SetAttributeNode(attr);
}
}
foreach(XmlNode ch in el.ChildNodes)
{
if (ch.GetType() == typeof(XmlElement))
RecCompXML(entities, singletons, doc, (XmlElement)ch, ref idx);
}
}
