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//
// XmlNamespaceManager.cs
//
// Author:
// Jason Diamond (jason@injektilo.org)
//
// (C) 2001 Jason Diamond http://injektilo.org/
//
using System.Collections;
namespace System.Xml
{
public class XmlNamespaceManager : IEnumerable
{
#region Fields
private XmlNameTable nameTable;
private NamespaceScope currentScope;
#endregion
#region Constructor
public XmlNamespaceManager (XmlNameTable nameTable)
{
this.nameTable = nameTable;
nameTable.Add ("xmlns");
nameTable.Add ("xml");
nameTable.Add (String.Empty);
nameTable.Add ("http://www.w3.org/2000/xmlns/");
nameTable.Add ("http://www.w3.org/XML/1998/namespace");
PushScope ();
}
#endregion
#region Properties
public virtual string DefaultNamespace {
get { return LookupNamespace (String.Empty); }
}
public XmlNameTable NameTable {
get { return nameTable; }
}
#endregion
#region Methods
public virtual void AddNamespace (string prefix, string uri)
{
if (prefix == null)
throw new ArgumentNullException ("prefix", "Value cannot be null.");
if (uri == null)
throw new ArgumentNullException ("uri", "Value cannot be null.");
if (prefix.Length > 2 && prefix.Substring (0, 3).ToLower () == "xml")
throw new ArgumentException ("Prefixes beginning with \"xml\" (regardless of whether the characters are uppercase, lowercase, or some combination thereof) are reserved for use by XML.", "prefix");
if (currentScope.Namespaces == null)
currentScope.Namespaces = new Hashtable ();
currentScope.Namespaces.Add (nameTable.Add (prefix), nameTable.Add (uri));
}
[MonoTODO]
public virtual IEnumerator GetEnumerator ()
{
throw new NotImplementedException ();
}
public virtual bool HasNamespace (string prefix)
{
return currentScope != null && currentScope.Namespaces != null && currentScope.Namespaces.Contains (prefix);
}
public virtual string LookupNamespace (string prefix)
{
NamespaceScope scope = currentScope;
while (scope != null) {
if (scope.Namespaces != null && scope.Namespaces.Contains (prefix))
return scope.Namespaces[prefix] as string;
scope = scope.Next;
}
switch (prefix) {
case "xmlns":
return nameTable.Get ("http://www.w3.org/2000/xmlns/");
case "xml":
return nameTable.Get ("http://www.w3.org/XML/1998/namespace");
case "":
return nameTable.Get (String.Empty);
}
return null;
}
public virtual string LookupPrefix (string uri)
{
if (uri == null)
return null;
NamespaceScope scope = currentScope;
while (scope != null)
{
if (scope.Namespaces != null && scope.Namespaces.ContainsValue (uri)) {
foreach (DictionaryEntry entry in scope.Namespaces) {
if (entry.Value.ToString() == uri)
return nameTable.Get (entry.Key as string) as string;
}
}
scope = scope.Next;
}
return String.Empty;
}
public virtual bool PopScope ()
{
if (currentScope != null)
currentScope = currentScope.Next;
return currentScope != null;
}
public virtual void PushScope ()
{
NamespaceScope newScope = new NamespaceScope ();
newScope.Next = currentScope;
currentScope = newScope;
}
[MonoTODO]
public virtual void RemoveNamespace (string prefix, string uri)
{
throw new NotImplementedException ();
}
#endregion
}
internal class NamespaceScope
{
internal NamespaceScope Next;
internal Hashtable Namespaces;
}
}
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