Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / NewXml / RegionIterator.cs / 1 / RegionIterator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace System.Xml { using System; using System.Data; using System.Diagnostics; using System.Text; internal abstract class BaseRegionIterator : BaseTreeIterator { internal BaseRegionIterator( DataSetMapper mapper ) : base( mapper ) { } } // Iterates over non-attribute nodes internal sealed class RegionIterator : BaseRegionIterator { private XmlBoundElement rowElement; private XmlNode currentNode; internal RegionIterator( XmlBoundElement rowElement ) : base( ((XmlDataDocument)(rowElement.OwnerDocument)).Mapper ) { Debug.Assert( rowElement != null && rowElement.Row != null ); this.rowElement = rowElement; this.currentNode = rowElement; } internal override void Reset() { currentNode = rowElement; } internal override XmlNode CurrentNode { get { return currentNode; } } internal override bool Next() { XmlNode nextNode; ElementState oldState = rowElement.ElementState; // We do not want to cause any foliation w/ this iterator or use this iterator once the region was defoliated Debug.Assert( oldState != ElementState.None ); // Try to move to the first child nextNode = currentNode.FirstChild; // No children, try next sibling if ( nextNode != null ) { currentNode = nextNode; // If we have been defoliated, we should have stayed that way Debug.Assert( (oldState == ElementState.Defoliated) ? (rowElement.ElementState == ElementState.Defoliated) : true ); // Rollback foliation rowElement.ElementState = oldState; return true; } return NextRight(); } internal override bool NextRight() { // Make sure we do not get past the rowElement if we call NextRight on a just initialized iterator and rowElement has no children if ( currentNode == rowElement ) { currentNode = null; return false; } ElementState oldState = rowElement.ElementState; // We do not want to cause any foliation w/ this iterator or use this iterator once the region was defoliated Debug.Assert( oldState != ElementState.None ); XmlNode nextNode = currentNode.NextSibling; if ( nextNode != null ) { currentNode = nextNode; // If we have been defoliated, we should have stayed that way Debug.Assert( (oldState == ElementState.Defoliated) ? (rowElement.ElementState == ElementState.Defoliated) : true ); // Rollback foliation rowElement.ElementState = oldState; return true; } // No next sibling, try the first sibling of from the parent chain nextNode = currentNode; while ( nextNode != rowElement && nextNode.NextSibling == null ) nextNode = nextNode.ParentNode; if ( nextNode == rowElement ) { currentNode = null; // If we have been defoliated, we should have stayed that way Debug.Assert( (oldState == ElementState.Defoliated) ? (rowElement.ElementState == ElementState.Defoliated) : true ); // Rollback foliation rowElement.ElementState = oldState; return false; } currentNode = nextNode.NextSibling; Debug.Assert( currentNode != null ); // If we have been defoliated, we should have stayed that way Debug.Assert( (oldState == ElementState.Defoliated) ? (rowElement.ElementState == ElementState.Defoliated) : true ); // Rollback foliation rowElement.ElementState = oldState; return true; } // Get the initial text value for the current node. You should be positioned on the node (element) for // which to get the initial text value, not on the text node. internal bool NextInitialTextLikeNodes( out String value ) { Debug.Assert( this.CurrentNode != null ); Debug.Assert( this.CurrentNode.NodeType == XmlNodeType.Element ); #if DEBUG // It's not OK to try to read the initial text value for sub-regions, because we do not know how to revert their initial state if ( this.CurrentNode.NodeType == XmlNodeType.Element && mapper.GetTableSchemaForElement( (XmlElement)(this.CurrentNode) ) != null ) { if ( this.CurrentNode != rowElement ) Debug.Assert( false ); } #endif ElementState oldState = rowElement.ElementState; // We do not want to cause any foliation w/ this iterator or use this iterator once the region was defoliated Debug.Assert( oldState != ElementState.None ); XmlNode n = this.CurrentNode.FirstChild; value = GetInitialTextFromNodes( ref n ); if ( n == null ) { // If we have been defoliated, we should have stayed that way Debug.Assert( (oldState == ElementState.Defoliated) ? (rowElement.ElementState == ElementState.Defoliated) : true ); // Rollback eventual foliation rowElement.ElementState = oldState; return NextRight(); } Debug.Assert( ! XmlDataDocument.IsTextLikeNode( n ) ); currentNode = n; // If we have been defoliated, we should have stayed that way Debug.Assert( (oldState == ElementState.Defoliated) ? (rowElement.ElementState == ElementState.Defoliated) : true ); // Rollback eventual foliation rowElement.ElementState = oldState; return true; } private static string GetInitialTextFromNodes( ref XmlNode n ) { string value = null; if ( n != null ) { // don't consider whitespace while ( n.NodeType == XmlNodeType.Whitespace ) { n = n.NextSibling; if ( n == null ) return String.Empty; } if ( XmlDataDocument.IsTextLikeNode( n ) && (n.NextSibling == null || ! XmlDataDocument.IsTextLikeNode( n.NextSibling )) ) { // don't use string builder if only one text node exists value = n.Value; n = n.NextSibling; } else { StringBuilder sb = new StringBuilder(); while ( n != null && XmlDataDocument.IsTextLikeNode( n ) ) { // Ignore non-significant whitespace nodes if ( n.NodeType != XmlNodeType.Whitespace ) sb.Append( n.Value ); n = n.NextSibling; } value = sb.ToString(); } } if ( value == null ) value = String.Empty; return value; } } } // 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
- ToolboxItemWrapper.cs
- DataGridViewComboBoxColumnDesigner.cs
- ToolTip.cs
- VectorKeyFrameCollection.cs
- CompilerWrapper.cs
- CfgParser.cs
- SettingsPropertyValueCollection.cs
- SoapIgnoreAttribute.cs
- TabItem.cs
- InvokePatternIdentifiers.cs
- Activation.cs
- sqlser.cs
- WorkflowApplicationUnhandledExceptionEventArgs.cs
- BamlBinaryReader.cs
- MultilineStringConverter.cs
- Operator.cs
- SecurityContextSecurityTokenResolver.cs
- TextBoxDesigner.cs
- ChtmlMobileTextWriter.cs
- CommandEventArgs.cs
- shaperfactoryquerycachekey.cs
- XmlSerializationReader.cs
- WindowsPen.cs
- ColorMap.cs
- TreeIterators.cs
- QuotedPrintableStream.cs
- InfoCardRSAPKCS1KeyExchangeFormatter.cs
- BinaryFormatter.cs
- X509Certificate.cs
- mediaeventshelper.cs
- RadioButtonRenderer.cs
- DrawingGroup.cs
- EventLogger.cs
- ConfigXmlElement.cs
- XmlSchemaValidator.cs
- SafeRegistryHandle.cs
- InvokeProviderWrapper.cs
- IISUnsafeMethods.cs
- JsonGlobals.cs
- CompiledRegexRunnerFactory.cs
- DocumentGridContextMenu.cs
- NameTable.cs
- EntityContainerAssociationSetEnd.cs
- LinqToSqlWrapper.cs
- SamlDelegatingWriter.cs
- EntityViewGenerator.cs
- ZoneIdentityPermission.cs
- ParagraphVisual.cs
- BadImageFormatException.cs
- XmlnsCache.cs
- ConfigurationFileMap.cs
- EntryIndex.cs
- BindingCompleteEventArgs.cs
- OleDbInfoMessageEvent.cs
- DataKeyCollection.cs
- GeneralTransform3D.cs
- ConsumerConnectionPointCollection.cs
- ThemeDirectoryCompiler.cs
- Button.cs
- Queue.cs
- DnsCache.cs
- CodeRemoveEventStatement.cs
- ToolStripSeparatorRenderEventArgs.cs
- BufferModesCollection.cs
- DataGridViewCellValueEventArgs.cs
- PropertyMappingExceptionEventArgs.cs
- FrameworkElementFactoryMarkupObject.cs
- RIPEMD160.cs
- RSAPKCS1KeyExchangeDeformatter.cs
- KeyEventArgs.cs
- Helper.cs
- DoubleUtil.cs
- ThreadPoolTaskScheduler.cs
- XPathSelectionIterator.cs
- SafeHandles.cs
- TrackPoint.cs
- UIntPtr.cs
- Compress.cs
- ZoneMembershipCondition.cs
- TableSectionStyle.cs
- LocalValueEnumerator.cs
- documentsequencetextview.cs
- InfoCardRequestException.cs
- FactoryMaker.cs
- CharacterShapingProperties.cs
- MatrixTransform3D.cs
- TextEditorSelection.cs
- WebPartCatalogAddVerb.cs
- DelayedRegex.cs
- SmiSettersStream.cs
- JapaneseCalendar.cs
- DataGridViewRow.cs
- Activation.cs
- DataFormat.cs
- HttpContextServiceHost.cs
- OdbcCommandBuilder.cs
- ToolStripRendererSwitcher.cs
- mediapermission.cs
- CallbackHandler.cs
- AuthenticationConfig.cs