Code:
/ FX-1434 / FX-1434 / 1.0 / 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.
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