Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / UnionExpr.cs / 1 / UnionExpr.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace MS.Internal.Xml.XPath { using System; using System.Xml; using System.Xml.XPath; using System.Diagnostics; using System.Xml.Xsl; internal sealed class UnionExpr : Query { internal Query qy1, qy2; private bool advance1, advance2; private XPathNavigator currentNode; private XPathNavigator nextNode; public UnionExpr(Query query1, Query query2) { this.qy1 = query1; this.qy2 = query2; this.advance1 = true; this.advance2 = true; } private UnionExpr(UnionExpr other) : base(other) { this.qy1 = Clone(other.qy1); this.qy2 = Clone(other.qy2); this.advance1 = other.advance1; this.advance2 = other.advance2; this.currentNode = Clone(other.currentNode); this.nextNode = Clone(other.nextNode); } public override void Reset() { qy1.Reset(); qy2.Reset(); advance1 = true; advance2 = true; nextNode = null; } public override void SetXsltContext(XsltContext xsltContext) { qy1.SetXsltContext(xsltContext); qy2.SetXsltContext(xsltContext); } public override object Evaluate(XPathNodeIterator context) { qy1.Evaluate(context); qy2.Evaluate(context); advance1 = true; advance2 = true; nextNode = null; base.ResetCount(); return this; } private XPathNavigator ProcessSamePosition(XPathNavigator result){ currentNode = result; advance1 = advance2 = true; return result; } private XPathNavigator ProcessBeforePosition(XPathNavigator res1, XPathNavigator res2){ nextNode = res2; advance2 = false; advance1 = true; currentNode = res1; return res1; } private XPathNavigator ProcessAfterPosition(XPathNavigator res1, XPathNavigator res2){ nextNode = res1; advance1 = false; advance2 = true; currentNode = res2; return res2; } public override XPathNavigator Advance() { XPathNavigator res1, res2; XmlNodeOrder order = 0; if (advance1) { res1 = qy1.Advance(); } else { res1 = nextNode; } if (advance2) { res2 = qy2.Advance(); } else { res2 = nextNode; } if (res1 != null && res2 != null) { order = CompareNodes(res1, res2); } else if (res2 == null) { advance1 = true; advance2 = false; currentNode = res1; nextNode = null; return res1; } else { advance1 = false; advance2 = true; currentNode = res2; nextNode = null; return res2; } if (order == XmlNodeOrder.Before) { return ProcessBeforePosition(res1, res2); } else if (order == XmlNodeOrder.After) { return ProcessAfterPosition(res1, res2); } else { // BugBug. In case of Unknown we sorting as the same. return ProcessSamePosition(res1); } } public override XPathNavigator MatchNode(XPathNavigator xsltContext) { if (xsltContext != null) { XPathNavigator result = qy1.MatchNode(xsltContext); if (result != null) { return result; } return qy2.MatchNode(xsltContext); } return null; } public override XPathResultType StaticType { get { return XPathResultType.NodeSet; } } public override XPathNodeIterator Clone() { return new UnionExpr(this); } public override XPathNavigator Current { get { return currentNode; } } public override int CurrentPosition { get { throw new InvalidOperationException(); } } public override void PrintQuery(XmlWriter w) { w.WriteStartElement(this.GetType().Name); if (qy1 != null) { qy1.PrintQuery(w); } if (qy2 != null) { qy2.PrintQuery(w); } w.WriteEndElement(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SelectingProviderEventArgs.cs
- Helper.cs
- Options.cs
- BinaryWriter.cs
- StaticContext.cs
- StringFunctions.cs
- StrokeNode.cs
- InfoCardMasterKey.cs
- TimeSpanValidator.cs
- HandlerBase.cs
- ProtectedProviderSettings.cs
- GeometryModel3D.cs
- InvalidDataException.cs
- PropertyValueChangedEvent.cs
- DataSourceControl.cs
- RightsManagementLicense.cs
- HttpContext.cs
- PersonalizableTypeEntry.cs
- CharacterHit.cs
- RoutedEventArgs.cs
- EventLogPermissionEntryCollection.cs
- BulletedList.cs
- SizeFConverter.cs
- SchemaNames.cs
- EntityClassGenerator.cs
- ProxyManager.cs
- XmlNodeList.cs
- SqlOuterApplyReducer.cs
- ToolStripItemImageRenderEventArgs.cs
- PasswordBoxAutomationPeer.cs
- SelectedCellsChangedEventArgs.cs
- FillErrorEventArgs.cs
- OutputCacheSettings.cs
- SimpleWebHandlerParser.cs
- BamlVersionHeader.cs
- BamlResourceContent.cs
- WinFormsComponentEditor.cs
- DataBoundLiteralControl.cs
- MinimizableAttributeTypeConverter.cs
- TextRunProperties.cs
- TableDetailsRow.cs
- Substitution.cs
- ByteStreamGeometryContext.cs
- LeftCellWrapper.cs
- FontSource.cs
- MSAANativeProvider.cs
- RepeatButtonAutomationPeer.cs
- SelectionItemProviderWrapper.cs
- TagPrefixInfo.cs
- ConstructorExpr.cs
- BitmapSourceSafeMILHandle.cs
- ExpressionParser.cs
- UnmanagedMarshal.cs
- EventManager.cs
- RoleBoolean.cs
- EntityDataReader.cs
- SiteMapPathDesigner.cs
- RichTextBox.cs
- BooleanStorage.cs
- Win32NamedPipes.cs
- TableLayoutRowStyleCollection.cs
- XmlWriterDelegator.cs
- SMSvcHost.cs
- TableStyle.cs
- WinInetCache.cs
- InitializingNewItemEventArgs.cs
- Track.cs
- StorageTypeMapping.cs
- EntityParameter.cs
- SchemaTableColumn.cs
- ThicknessAnimationBase.cs
- CodeCatchClause.cs
- EntityClassGenerator.cs
- SimpleWorkerRequest.cs
- CodeStatementCollection.cs
- SessionEndingEventArgs.cs
- ComplexTypeEmitter.cs
- TabControl.cs
- invalidudtexception.cs
- KeyPressEvent.cs
- FrameworkElementFactory.cs
- XPathNavigatorKeyComparer.cs
- TableCellAutomationPeer.cs
- DelimitedListTraceListener.cs
- SmiMetaData.cs
- TextDataBindingHandler.cs
- DeflateEmulationStream.cs
- Viewport2DVisual3D.cs
- ChannelSinkStacks.cs
- HandlerBase.cs
- PathGradientBrush.cs
- CustomGrammar.cs
- FixedNode.cs
- TimeSpan.cs
- ModuleBuilder.cs
- CriticalFileToken.cs
- StringFunctions.cs
- CatalogUtil.cs
- PopupRootAutomationPeer.cs
- WpfWebRequestHelper.cs