/// <summary>
/// Creates an <see cref="Catalog"/> instance from the definition held in
/// the indicated URL. If the file has been requested previously then the
/// cached object is returned.
/// </summary>
/// <param name="url">The catalog's URI.</param>
/// <param name="validate">Determines if the catalog should be validated.</param>
/// <returns>The <see cref="Catalog"/> instance created from the URL.</returns>
public static Catalog Find(String url, bool validate)
{
if (catalogs.ContainsKey(url))
{
return(catalogs [url]);
}
Catalog catalog = null;
XmlReader reader = new XmlTextReader(url);
Stack <GroupEntry> stack = new Stack <GroupEntry> ();
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
String localName = reader.LocalName;
if (localName.Equals("catalog"))
{
String prefer = reader.GetAttribute("prefer");
String xmlbase = reader.GetAttribute("xml:base");
stack.Push((catalog = new Catalog(url, prefer, xmlbase)).Definition);
}
else if (localName.Equals("group"))
{
String prefer = reader.GetAttribute("prefer");
String xmlbase = reader.GetAttribute("xml:base");
stack.Push(catalog.Definition.AddGroup(prefer, xmlbase));
}
else
{
GroupEntry group = stack.Peek();
if (localName.Equals("public"))
{
String publicId = reader.GetAttribute("publicId");
String uri = reader.GetAttribute("uri");
String xmlbase = reader.GetAttribute("xml:base");
group.AddPublic(publicId, uri, xmlbase);
}
else if (localName.Equals("system"))
{
String systemId = reader.GetAttribute("systemId");
String uri = reader.GetAttribute("uri");
String xmlbase = reader.GetAttribute("xml:base");
group.AddSystem(systemId, uri, xmlbase);
}
else if (localName.Equals("rewriteSystem"))
{
String startString = reader.GetAttribute("systemIdStartString");
String rewritePrefix = reader.GetAttribute("rewritePrefix");
group.AddRewriteSystem(startString, rewritePrefix);
}
else if (localName.Equals("delegatePublic"))
{
String startString = reader.GetAttribute("publicIdStartString");
String file = reader.GetAttribute("catalog");
String xmlbase = reader.GetAttribute("xml:base");
group.AddDelegatePublic(startString, file, xmlbase);
}
else if (localName.Equals("delegateSystem"))
{
String startString = reader.GetAttribute("systemIdStartString");
String file = reader.GetAttribute("catalog");
String xmlbase = reader.GetAttribute("xml:base");
group.AddDelegateSystem(startString, file, xmlbase);
}
else if (localName.Equals("uri"))
{
String name = reader.GetAttribute("name");
String uri = reader.GetAttribute("uri");
String xmlbase = reader.GetAttribute("xml:base");
group.AddUri(name, uri, xmlbase);
}
else if (localName.Equals("rewriteUri"))
{
String startString = reader.GetAttribute("uriStartString");
String rewritePrefix = reader.GetAttribute("rewritePrefix");
group.AddRewriteUri(startString, rewritePrefix);
}
else if (localName.Equals("delegateUri"))
{
String startString = reader.GetAttribute("uriStartString");
String file = reader.GetAttribute("catalog");
String xmlbase = reader.GetAttribute("xml:base");
group.AddDelegateUri(startString, file, xmlbase);
}
else if (localName.Equals("nextCatalog"))
{
String file = reader.GetAttribute("catalog");
String xmlbase = reader.GetAttribute("xml:base");
group.AddNextCatalog(file, xmlbase);
}
else
{
throw new Exception("Unexpected element tag in XML catalog file");
}
}
}
else if (reader.NodeType == XmlNodeType.EndElement)
{
String localName = reader.LocalName;
if (localName.Equals("catalog") || localName.Equals("group"))
{
stack.Pop();
}
}
}
reader.Close();
return(catalogs [url] = catalog);
}
