// (C) 2002 Kral Ferch
//
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
using System;
using System.Collections;
namespace System.Xml
{
- public class XmlNodeListChildren : XmlNodeList
+ internal class XmlNodeListChildren : XmlNodeList
{
#region Enumerator
- ///////////////////////////////////////////////////////////////////////
- //
- // Enumerator
- //
- ///////////////////////////////////////////////////////////////////////
+
private class Enumerator : IEnumerator
{
+ XmlNode parent;
XmlLinkedNode currentChild;
- XmlLinkedNode lastChild;
+ bool passedLastNode;
- internal Enumerator (XmlLinkedNode lastChild)
+ internal Enumerator (XmlNode parent)
{
currentChild = null;
- this.lastChild = lastChild;
+ this.parent = parent;
+ passedLastNode = false;
}
public virtual object Current {
get {
+ if ((currentChild == null) ||
+ (parent.LastLinkedChild == null) ||
+ (passedLastNode == true))
+ throw new InvalidOperationException();
+
return currentChild;
}
}
public virtual bool MoveNext()
{
- bool passedEndOfCollection = Object.ReferenceEquals(currentChild, lastChild);
+ bool movedNext = true;
- if (currentChild == null) {
- currentChild = lastChild;
+ if (parent.LastLinkedChild == null) {
+ movedNext = false;
+ }
+ else if (currentChild == null) {
+ currentChild = parent.LastLinkedChild.NextLinkedSibling;
+ }
+ else {
+ if (Object.ReferenceEquals(currentChild, parent.LastLinkedChild)) {
+ movedNext = false;
+ passedLastNode = true;
+ }
+ else {
+ currentChild = currentChild.NextLinkedSibling;
+ }
}
- currentChild = currentChild.NextLinkedSibling;
-
- return passedEndOfCollection;
+ return movedNext;
}
public virtual void Reset()
#endregion
#region Fields
- ///////////////////////////////////////////////////////////////////////
- //
- // Fields
- //
- ///////////////////////////////////////////////////////////////////////
- XmlLinkedNode lastChild;
+ XmlNode parent;
#endregion
#region Constructors
- ///////////////////////////////////////////////////////////////////////
- //
- // Constructors
- //
- ///////////////////////////////////////////////////////////////////////
-
- public XmlNodeListChildren(XmlLinkedNode lastChild)
+ public XmlNodeListChildren(XmlNode parent)
{
- this.lastChild = lastChild;
+ this.parent = parent;
}
#endregion
#region Properties
- ///////////////////////////////////////////////////////////////////////
- //
- // Properties
- //
- ///////////////////////////////////////////////////////////////////////
public override int Count {
get {
int count = 0;
- if (lastChild != null) {
- XmlLinkedNode currentChild = lastChild.NextLinkedSibling;
+ if (parent.LastLinkedChild != null) {
+ XmlLinkedNode currentChild = parent.LastLinkedChild.NextLinkedSibling;
count = 1;
- while (!Object.ReferenceEquals(currentChild, lastChild)) {
+ while (!Object.ReferenceEquals(currentChild, parent.LastLinkedChild)) {
currentChild = currentChild.NextLinkedSibling;
count++;
}
#endregion
#region Methods
- ///////////////////////////////////////////////////////////////////////
- //
- // Methods
- //
- ///////////////////////////////////////////////////////////////////////
public override IEnumerator GetEnumerator ()
{
- return new Enumerator(lastChild);
+ return new Enumerator(parent);
}
public override XmlNode Item (int index)
{
XmlNode requestedNode = null;
+ // Return null if index is out of range. by DOM design.
+ if (Count <= index)
+ return null;
+
// Instead of checking for && index < Count which has to walk
// the whole list to get a count, we'll just keep a count since
// we have to walk the list anyways to get to index.
- if ((index >= 0) && (lastChild != null)) {
- XmlLinkedNode currentChild = lastChild.NextLinkedSibling;
+ if ((index >= 0) && (parent.LastLinkedChild != null)) {
+ XmlLinkedNode currentChild = parent.LastLinkedChild.NextLinkedSibling;
int count = 0;
- while ((count < index) && !Object.ReferenceEquals(currentChild, lastChild))
+ while ((count < index) && !Object.ReferenceEquals(currentChild, parent.LastLinkedChild))
{
currentChild = currentChild.NextLinkedSibling;
count++;
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