XmlILIndex.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / Runtime / XmlILIndex.cs / 1305376 / XmlILIndex.cs
                        

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

namespace System.Xml.Xsl.Runtime {
 
    /// 
    /// This class manages nodes from one input document, indexed by key value(s). 
    ///  
    [EditorBrowsable(EditorBrowsableState.Never)]
    public sealed class XmlILIndex { 
        private Dictionary table;

        /// 
        /// This constructor is internal so that external users cannot construct it (and therefore we do not have to test it separately). 
        /// 
        internal XmlILIndex() { 
            this.table = new Dictionary(); 
        }
 
        /// 
        /// Add a node indexed by the specified key value.
        /// 
        public void Add(string key, XPathNavigator navigator) { 
            XmlQueryNodeSequence seq;
 
            if (!this.table.TryGetValue(key, out seq)) { 
                // Create a new sequence and add it to the index
                seq = new XmlQueryNodeSequence(); 
                seq.AddClone(navigator);
                this.table.Add(key, seq);
            }
            else { 
                // The nodes are guaranteed to be added in document order with possible duplicates.
                // Add node to the existing sequence if it differs from the last one. 
                Debug.Assert(navigator.ComparePosition(seq[seq.Count - 1]) >= 0, "Index nodes must be added in document order"); 
                if (!navigator.IsSamePosition(seq[seq.Count - 1])) {
                    seq.AddClone(navigator); 
                }
            }
        }
 
        /// 
        /// Lookup a sequence of nodes that are indexed by the specified key value. 
        /// Return a non-null empty sequence, if there are no nodes associated with the key. 
        /// 
        public XmlQueryNodeSequence Lookup(string key) { 
            XmlQueryNodeSequence seq;

            if (!this.table.TryGetValue(key, out seq))
                seq = new XmlQueryNodeSequence(); 

            return seq; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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