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/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / XmlDocumentSchema.cs / 1 / XmlDocumentSchema.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.Design { using System.Collections; using System.Collections.Specialized; using System.Diagnostics; using System.Xml; using System.Xml.XPath; ////// A class to expose hierarchical schema from an XmlDocument object. /// This is used by data source designers to enable data-bound to /// traverse their schema at design time. /// [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] public sealed class XmlDocumentSchema : IDataSourceSchema { private OrderedDictionary _rootSchema; private IDataSourceViewSchema[] _viewSchemas; private bool _includeSpecialSchema; public XmlDocumentSchema(XmlDocument xmlDocument, string xPath) : this(xmlDocument, xPath, false) { } internal XmlDocumentSchema(XmlDocument xmlDocument, string xPath, bool includeSpecialSchema) { if (xmlDocument == null) { throw new ArgumentNullException("xmlDocument"); } _includeSpecialSchema = includeSpecialSchema; _rootSchema = new OrderedDictionary(); // Get a list of all element nodes in document order and add them // to the schema hierarchy XPathNavigator nav = xmlDocument.CreateNavigator(); if (!String.IsNullOrEmpty(xPath)) { // If there is an XPath, go through each XPath result and add its descendants XPathNodeIterator xPathIterator = nav.Select(xPath); while (xPathIterator.MoveNext()) { XPathNodeIterator childIterator = xPathIterator.Current.SelectDescendants(XPathNodeType.Element, true); while (childIterator.MoveNext()) { Debug.Assert(childIterator.Current.NodeType == XPathNodeType.Element); AddSchemaElement(childIterator.Current, xPathIterator.Current); } } } else { // If there is no XPath, just go through the root's descendants XPathNodeIterator childIterator = nav.SelectDescendants(XPathNodeType.Element, true); while (childIterator.MoveNext()) { Debug.Assert(childIterator.Current.NodeType == XPathNodeType.Element); AddSchemaElement(childIterator.Current, nav); } } } private void AddSchemaElement(XPathNavigator nav, XPathNavigator rootNav) { // Get list of all ancestors in reverse document order in order // to get a hierarchical path to this element System.Collections.Generic.Listpath = new System.Collections.Generic.List (); XPathNodeIterator parentIterator = nav.SelectAncestors(XPathNodeType.Element, true); while (parentIterator.MoveNext()) { Debug.Assert(parentIterator.Current.NodeType == XPathNodeType.Element); path.Add(parentIterator.Current.Name); if (parentIterator.Current.IsSamePosition(rootNav)) { // Stop if we get to the root of this sub-tree break; } } path.Reverse(); Debug.Assert(path.Count > 0, "Expected path to contain at least one entry (the node itself!)"); // Find the location in the schema where the attributes of this element belong OrderedDictionary schemaLevel = _rootSchema; Pair nodeEntry = null; foreach (string pathPart in path) { nodeEntry = schemaLevel[pathPart] as Pair; if (nodeEntry == null) { // Demand-create an entry for this type of node if it is not found nodeEntry = new Pair(new OrderedDictionary() /* list of child node types */, new ArrayList() /* list of attributes */); // Add this type of child node to the current parent type we are at schemaLevel.Add(pathPart, nodeEntry); } // Advance one level deeper schemaLevel = (OrderedDictionary)nodeEntry.First; } Debug.Assert(nodeEntry != null, "Did not expect null schema entry - it should be auto-created"); // Add the list of attributes to this type of node AddAttributeList(nav, (ArrayList)nodeEntry.Second); } private void AddAttributeList(XPathNavigator nav, ArrayList attrs) { Debug.Assert(attrs != null); if (!nav.HasAttributes) { return; } bool success = nav.MoveToFirstAttribute(); Debug.Assert(success); // Go through all the attributes and add new ones to the list do { if (!attrs.Contains(nav.Name)) { attrs.Add(nav.Name); } } while (nav.MoveToNextAttribute()); success = nav.MoveToParent(); Debug.Assert(success); } public IDataSourceViewSchema[] GetViews() { if (_viewSchemas == null) { _viewSchemas = new IDataSourceViewSchema[_rootSchema.Count]; int i = 0; foreach (DictionaryEntry de in _rootSchema) { _viewSchemas[i] = new XmlDocumentViewSchema((string)de.Key, (Pair)de.Value, _includeSpecialSchema); i++; } } return _viewSchemas; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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