XPathNodeList.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / Dom / XPathNodeList.cs / 1 / XPathNodeList.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace System.Xml { 
    using System.Xml.XPath;
    using System.Diagnostics; 
    using System.Collections;
    using System.Collections.Generic;

    internal class XPathNodeList: XmlNodeList { 
        List list;
        XPathNodeIterator nodeIterator; 
        bool done; 

        public XPathNodeList(XPathNodeIterator nodeIterator) { 
            this.nodeIterator = nodeIterator;
            this.list = new List();
            this.done = false;
        } 

        public override int Count { 
            get { 
                if (! done) {
                    ReadUntil(Int32.MaxValue); 
                }
                return list.Count;
            }
        } 

        private static readonly object[] nullparams = {}; 
 
        private XmlNode GetNode(XPathNavigator n) {
            IHasXmlNode iHasNode = (IHasXmlNode) n; 
            return iHasNode.GetNode();
        }

        internal int ReadUntil(int index) { 
            int count = list.Count;
            while (! done && count <= index) { 
                if (nodeIterator.MoveNext()) { 
                    XmlNode n = GetNode(nodeIterator.Current);
                    if (n != null) { 
                        list.Add(n);
                        count++;
                    }
                } else { 
                    done = true;
                    break; 
                } 
            }
            return count; 
        }

        public override XmlNode Item(int index) {
            if (list.Count <= index) { 
                ReadUntil(index);
            } 
            if (index < 0 || list.Count <= index) { 
                return null;
            } 
            return list[index];
        }

        public override IEnumerator GetEnumerator() { 
            return new XmlNodeListEnumerator(this);
        } 
    } 

    internal class XmlNodeListEnumerator : IEnumerator { 
        XPathNodeList list;
        int index;
        bool valid;
 
        public XmlNodeListEnumerator(XPathNodeList list) {
            this.list = list; 
            this.index = -1; 
            this.valid = false;
        } 

        public void Reset() {
            index = -1;
        } 

        public bool MoveNext() { 
            index++; 
            int count = list.ReadUntil(index + 1);   // read past for delete-node case
            if (count - 1 < index) { 
                return false;
            }
            valid = (list[index] != null);
            return valid; 
        }
 
       public object Current { 
            get {
                if (valid) { 
                    return list[index];
                }
                return null;
            } 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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