Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / XPath / Internal / UnionExpr.cs / 1305376 / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CalendarButtonAutomationPeer.cs
- TextTreeNode.cs
- PrinterUnitConvert.cs
- SplineKeyFrames.cs
- MemberPath.cs
- SmtpReplyReader.cs
- SessionIDManager.cs
- DirectionalLight.cs
- UpdatableGenericsFeature.cs
- CodeChecksumPragma.cs
- InfoCardArgumentException.cs
- SqlClientMetaDataCollectionNames.cs
- NetworkInterface.cs
- X509AudioLogo.cs
- WebControlsSection.cs
- ToolStripLocationCancelEventArgs.cs
- ZoneLinkButton.cs
- ErasingStroke.cs
- WorkflowServiceHostFactory.cs
- PointAnimationUsingKeyFrames.cs
- WCFServiceClientProxyGenerator.cs
- BitArray.cs
- X509Chain.cs
- QueryCorrelationInitializer.cs
- NotificationContext.cs
- ControlUtil.cs
- MsmqReceiveParameters.cs
- OverlappedAsyncResult.cs
- ConfigurationSettings.cs
- UrlMappingsSection.cs
- XmlAggregates.cs
- ListItemParagraph.cs
- ChtmlTextWriter.cs
- CompilationUtil.cs
- ApplicationBuildProvider.cs
- ToolTipAutomationPeer.cs
- TreeNodeCollection.cs
- Vertex.cs
- GeometryHitTestParameters.cs
- DbDataAdapter.cs
- InvalidOperationException.cs
- BitmapMetadataBlob.cs
- FormViewPageEventArgs.cs
- PropertyTab.cs
- IdnElement.cs
- SSmlParser.cs
- RunWorkerCompletedEventArgs.cs
- SqlDataSourceCommandEventArgs.cs
- SizeConverter.cs
- SystemWebExtensionsSectionGroup.cs
- XmlSchemaInclude.cs
- XmlSubtreeReader.cs
- Stopwatch.cs
- EncryptedPackage.cs
- WebMessageEncodingBindingElement.cs
- XmlSchemaAnyAttribute.cs
- SqlTransaction.cs
- Control.cs
- SafeFileMappingHandle.cs
- ClientConfigurationSystem.cs
- DefaultEventAttribute.cs
- RowUpdatedEventArgs.cs
- CacheRequest.cs
- CompensateDesigner.cs
- AssemblyHash.cs
- TemplateKeyConverter.cs
- Queue.cs
- DigitShape.cs
- SessionEndingCancelEventArgs.cs
- SortQuery.cs
- SqlDataSourceConfigureFilterForm.cs
- UriExt.cs
- FunctionCommandText.cs
- DrawingContext.cs
- EventLog.cs
- ContentIterators.cs
- sqlcontext.cs
- Condition.cs
- Popup.cs
- DefaultHttpHandler.cs
- VisualStates.cs
- FrameworkRichTextComposition.cs
- CommandManager.cs
- SessionPageStatePersister.cs
- FacetChecker.cs
- SessionSwitchEventArgs.cs
- TransformerConfigurationWizardBase.cs
- XPathException.cs
- WebSysDisplayNameAttribute.cs
- SamlAuthorityBinding.cs
- PageHandlerFactory.cs
- OleStrCAMarshaler.cs
- ResXResourceReader.cs
- ExpressionNode.cs
- FileDataSource.cs
- DataServiceStreamResponse.cs
- XmlReaderDelegator.cs
- BamlReader.cs
- TextTrailingWordEllipsis.cs
- HttpRuntimeSection.cs