Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / Xml / System / Xml / XPath / Internal / precedingquery.cs / 1 / precedingquery.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.Collections.Generic; using StackNav = ClonableStack; // Algorithm: // Input assumption: qyInput is in DocOrder. // Preceding of a sequence of nodes will be preceding of last node in DocOrder in that sequence. // Because qyInput is in DO last input is last node in DO. -- "last" // If last node is attribute or namespace move last to it element. // Push this last node and all its ancestors into the ancestorStk. The root node will be the top-most element on the stack. // Create descendent iterator from the root. -- "workIterator" // Advancing workIterator we meet all nodes from the ancestorStk in stack order. Nodes in ancestorStk do no belong to the // the 'preceding' axis and must be ignored. // Last node in ancestorStk is a centinel node; when we pop it from ancestorStk, we should stop iterations. internal sealed class PrecedingQuery : BaseAxisQuery { private XPathNodeIterator workIterator; private StackNav ancestorStk; public PrecedingQuery(Query qyInput, string name, string prefix, XPathNodeType typeTest) : base(qyInput, name, prefix, typeTest) { ancestorStk = new StackNav(); } private PrecedingQuery(PrecedingQuery other) : base(other) { this.workIterator = Clone(other.workIterator); this.ancestorStk = other.ancestorStk.Clone(); } public override void Reset() { workIterator = null; ancestorStk.Clear(); base.Reset(); } public override XPathNavigator Advance() { if (workIterator == null) { XPathNavigator last; { XPathNavigator input = qyInput.Advance(); if (input == null) { return null; } last = input.Clone(); do { last.MoveTo(input); } while ((input = qyInput.Advance()) != null); if (last.NodeType == XPathNodeType.Attribute || last.NodeType == XPathNodeType.Namespace) { last.MoveToParent(); } } // Fill ancestorStk : do { ancestorStk.Push(last.Clone()); } while (last.MoveToParent()); // Create workIterator : // last.MoveToRoot(); We are on root already workIterator = last.SelectDescendants(XPathNodeType.All, true); } while (workIterator.MoveNext()) { currentNode = workIterator.Current; if (currentNode.IsSamePosition(ancestorStk.Peek())) { ancestorStk.Pop(); if (ancestorStk.Count == 0) { currentNode = null; workIterator = null; Debug.Assert(qyInput.Advance() == null, "we read all qyInput.Advance() already"); return null; } continue; } if (matches(currentNode)) { position++; return currentNode; } } Debug.Fail("Algorithm error: we missed the centinel node"); return null; } public override XPathNodeIterator Clone() { return new PrecedingQuery(this); } public override QueryProps Properties { get { return base.Properties | QueryProps.Reverse; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // 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.Collections.Generic; using StackNav = ClonableStack; // Algorithm: // Input assumption: qyInput is in DocOrder. // Preceding of a sequence of nodes will be preceding of last node in DocOrder in that sequence. // Because qyInput is in DO last input is last node in DO. -- "last" // If last node is attribute or namespace move last to it element. // Push this last node and all its ancestors into the ancestorStk. The root node will be the top-most element on the stack. // Create descendent iterator from the root. -- "workIterator" // Advancing workIterator we meet all nodes from the ancestorStk in stack order. Nodes in ancestorStk do no belong to the // the 'preceding' axis and must be ignored. // Last node in ancestorStk is a centinel node; when we pop it from ancestorStk, we should stop iterations. internal sealed class PrecedingQuery : BaseAxisQuery { private XPathNodeIterator workIterator; private StackNav ancestorStk; public PrecedingQuery(Query qyInput, string name, string prefix, XPathNodeType typeTest) : base(qyInput, name, prefix, typeTest) { ancestorStk = new StackNav(); } private PrecedingQuery(PrecedingQuery other) : base(other) { this.workIterator = Clone(other.workIterator); this.ancestorStk = other.ancestorStk.Clone(); } public override void Reset() { workIterator = null; ancestorStk.Clear(); base.Reset(); } public override XPathNavigator Advance() { if (workIterator == null) { XPathNavigator last; { XPathNavigator input = qyInput.Advance(); if (input == null) { return null; } last = input.Clone(); do { last.MoveTo(input); } while ((input = qyInput.Advance()) != null); if (last.NodeType == XPathNodeType.Attribute || last.NodeType == XPathNodeType.Namespace) { last.MoveToParent(); } } // Fill ancestorStk : do { ancestorStk.Push(last.Clone()); } while (last.MoveToParent()); // Create workIterator : // last.MoveToRoot(); We are on root already workIterator = last.SelectDescendants(XPathNodeType.All, true); } while (workIterator.MoveNext()) { currentNode = workIterator.Current; if (currentNode.IsSamePosition(ancestorStk.Peek())) { ancestorStk.Pop(); if (ancestorStk.Count == 0) { currentNode = null; workIterator = null; Debug.Assert(qyInput.Advance() == null, "we read all qyInput.Advance() already"); return null; } continue; } if (matches(currentNode)) { position++; return currentNode; } } Debug.Fail("Algorithm error: we missed the centinel node"); return null; } public override XPathNodeIterator Clone() { return new PrecedingQuery(this); } public override QueryProps Properties { get { return base.Properties | QueryProps.Reverse; } } } } // 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
- DataRow.cs
- BuildDependencySet.cs
- TextFormatterImp.cs
- DependencyPropertyAttribute.cs
- Variable.cs
- ObjectListItem.cs
- StateItem.cs
- CustomAttribute.cs
- WmpBitmapEncoder.cs
- SqlCommandBuilder.cs
- GenericTextProperties.cs
- InkCanvasInnerCanvas.cs
- HMACSHA1.cs
- MailWebEventProvider.cs
- RelationshipConverter.cs
- TableRowsCollectionEditor.cs
- BasicBrowserDialog.cs
- PresentationAppDomainManager.cs
- HtmlLink.cs
- UniqueEventHelper.cs
- EdmToObjectNamespaceMap.cs
- XmlReader.cs
- COMException.cs
- TemplateControlParser.cs
- LineServices.cs
- SmtpNtlmAuthenticationModule.cs
- RuntimeConfigurationRecord.cs
- SystemInformation.cs
- Thumb.cs
- LineSegment.cs
- DataQuery.cs
- XPathSelectionIterator.cs
- SudsWriter.cs
- SQLInt16Storage.cs
- Comparer.cs
- ModifiableIteratorCollection.cs
- EventWaitHandle.cs
- SmiEventSink_Default.cs
- Int32Animation.cs
- MaterialCollection.cs
- VariableBinder.cs
- UIInitializationException.cs
- DistributedTransactionPermission.cs
- RayHitTestParameters.cs
- WindowsPrincipal.cs
- FileSecurity.cs
- ConsoleCancelEventArgs.cs
- _Win32.cs
- DescendentsWalker.cs
- MruCache.cs
- SqlGatherConsumedAliases.cs
- TextSyndicationContentKindHelper.cs
- XmlSchemaExporter.cs
- WebBaseEventKeyComparer.cs
- SpotLight.cs
- SecurityTokenProviderContainer.cs
- Menu.cs
- BasicExpandProvider.cs
- AssemblySettingAttributes.cs
- HttpSessionStateWrapper.cs
- RawUIStateInputReport.cs
- Helper.cs
- UnaryNode.cs
- ComplexPropertyEntry.cs
- DataGridViewSelectedCellsAccessibleObject.cs
- PropertyGridCommands.cs
- MessageQueueCriteria.cs
- ExpressionBuilderContext.cs
- ParallelTimeline.cs
- DecimalMinMaxAggregationOperator.cs
- SpecialNameAttribute.cs
- GenericWebPart.cs
- ToolStripHighContrastRenderer.cs
- ConfigurationStrings.cs
- RectangleConverter.cs
- MetadataItem_Static.cs
- XmlNamespaceMappingCollection.cs
- ExplicitDiscriminatorMap.cs
- SmtpFailedRecipientsException.cs
- OdbcFactory.cs
- WindowsToolbar.cs
- GorillaCodec.cs
- GcHandle.cs
- listitem.cs
- MoveSizeWinEventHandler.cs
- OrderingExpression.cs
- MenuStrip.cs
- GridViewRowCollection.cs
- RegularExpressionValidator.cs
- LineGeometry.cs
- BitmapSource.cs
- WebColorConverter.cs
- TableItemProviderWrapper.cs
- SspiNegotiationTokenAuthenticator.cs
- NativeMethods.cs
- ContentWrapperAttribute.cs
- GroupItem.cs
- MarkerProperties.cs
- DirectoryNotFoundException.cs
- GenericTypeParameterBuilder.cs