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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Data / XmlDataCollection.cs / 1 / XmlDataCollection.cs
//---------------------------------------------------------------------------- // //// Copyright (C) 2003 by Microsoft Corporation. All rights reserved. // // // // Description: Data collection produced by an XmlDataProvider // // Specs: [....]/connecteddata/M5%20Specs/IDataCollection.mht // //--------------------------------------------------------------------------- using System.Xml; using System.Collections.ObjectModel; using System.Collections.Specialized; using System.Windows.Data; using System.Windows.Markup; namespace MS.Internal.Data { ////// Implementation of a data collection based on ArrayList, /// implementing INotifyCollectionChanged to notify listeners /// when items get added, removed or the whole list is refreshed. /// internal class XmlDataCollection : ReadOnlyObservableCollection{ //----------------------------------------------------- // // Constructors // //----------------------------------------------------- /// /// Initializes a new instance of XmlDataCollection that is empty and has the specified initial capacity. /// /// Parent Xml Data Source internal XmlDataCollection(XmlDataProvider xmlDataProvider) : base(new ObservableCollection()) { _xds = xmlDataProvider; } //------------------------------------------------------ // // Internal Properties // //----------------------------------------------------- /// /// XmlNamespaceManager property, XmlNamespaceManager used for executing XPath queries. /// internal XmlNamespaceManager XmlNamespaceManager { get { if (_nsMgr == null && _xds != null) _nsMgr = _xds.XmlNamespaceManager; return _nsMgr; } set { _nsMgr = value; } } internal XmlDataProvider ParentXmlDataProvider { get { return _xds; } } //------------------------------------------------------ // // Internal Methods // //------------------------------------------------------ // return true if the counts are different or the identity of the nodes have changed internal bool CollectionHasChanged(XmlNodeList nodes) { int count = this.Count; if (count != nodes.Count) return true; for (int i = 0; i < count; ++i) { if (this[i] != nodes[i]) return true; } return false; } // Update the collection using new query results internal void SynchronizeCollection(XmlNodeList nodes) { if (nodes == null) { Items.Clear(); return; } int i = 0, j; while (i < this.Count && i < nodes.Count) { if (this[i] != nodes[i]) { // starting after current node, see if the old node is still in the new list. for (j = i + 1; j < nodes.Count; ++j) { if (this[i] == nodes[j]) { break; } } if (j < nodes.Count) { // the node from existing collection is found at [j] in the new collection; // this means the node(s) [i ~ j-1] in new collection should be inserted. while (i < j) { Items.Insert(i, nodes[i]); ++i; } ++i; // advance to next node } else { // the node from existing collection is no longer in // the new collection, delete it. Items.RemoveAt(i); // do not advance to the next node } } else { // nodes are the same; advance to the next node. ++i; } } // Remove any extra nodes left over in the old collection while (i < this.Count) { Items.RemoveAt(i); } // Add any extra new nodes from the new collection while (i < nodes.Count) { Items.Insert(i, nodes[i]); ++i; } } private XmlDataProvider _xds; private XmlNamespaceManager _nsMgr; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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