Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / Cache / XPathDocumentIterator.cs / 1 / XPathDocumentIterator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.Xml; using System.Xml.XPath; using System.Diagnostics; namespace MS.Internal.Xml.Cache { ////// Base internal class of all XPathDocument XPathNodeIterator implementations. /// internal abstract class XPathDocumentBaseIterator : XPathNodeIterator { protected XPathDocumentNavigator ctxt; protected int pos; ////// Create a new iterator that is initially positioned on the "ctxt" node. /// protected XPathDocumentBaseIterator(XPathDocumentNavigator ctxt) { this.ctxt = new XPathDocumentNavigator(ctxt); } ////// Create a new iterator that is a copy of "iter". /// protected XPathDocumentBaseIterator(XPathDocumentBaseIterator iter) { this.ctxt = new XPathDocumentNavigator(iter.ctxt); this.pos = iter.pos; } ////// Return the current navigator. /// public override XPathNavigator Current { get { return this.ctxt; } } ////// Return the iterator's current position. /// public override int CurrentPosition { get { return this.pos; } } } ////// Iterate over all element children with a particular QName. /// internal class XPathDocumentElementChildIterator : XPathDocumentBaseIterator { private string localName, namespaceUri; ////// Create an iterator that ranges over all element children of "parent" having the specified QName. /// public XPathDocumentElementChildIterator(XPathDocumentNavigator parent, string name, string namespaceURI) : base(parent) { if (namespaceURI == null) throw new ArgumentNullException("namespaceURI"); this.localName = parent.NameTable.Get(name); this.namespaceUri = namespaceURI; } ////// Create a new iterator that is a copy of "iter". /// public XPathDocumentElementChildIterator(XPathDocumentElementChildIterator iter) : base(iter) { this.localName = iter.localName; this.namespaceUri = iter.namespaceUri; } ////// Create a copy of this iterator. /// public override XPathNodeIterator Clone() { return new XPathDocumentElementChildIterator(this); } ////// Position the iterator to the next matching child. /// public override bool MoveNext() { if (this.pos == 0) { if (!this.ctxt.MoveToChild(this.localName, this.namespaceUri)) return false; } else { if (!this.ctxt.MoveToNext(this.localName, this.namespaceUri)) return false; } this.pos++; return true; } } ////// Iterate over all content children with a particular XPathNodeType. /// internal class XPathDocumentKindChildIterator : XPathDocumentBaseIterator { private XPathNodeType typ; ////// Create an iterator that ranges over all content children of "parent" having the specified XPathNodeType. /// public XPathDocumentKindChildIterator(XPathDocumentNavigator parent, XPathNodeType typ) : base(parent) { this.typ = typ; } ////// Create a new iterator that is a copy of "iter". /// public XPathDocumentKindChildIterator(XPathDocumentKindChildIterator iter) : base(iter) { this.typ = iter.typ; } ////// Create a copy of this iterator. /// public override XPathNodeIterator Clone() { return new XPathDocumentKindChildIterator(this); } ////// Position the iterator to the next descendant. /// public override bool MoveNext() { if (this.pos == 0) { if (!this.ctxt.MoveToChild(this.typ)) return false; } else { if (!this.ctxt.MoveToNext(this.typ)) return false; } this.pos++; return true; } } ////// Iterate over all element descendants with a particular QName. /// internal class XPathDocumentElementDescendantIterator : XPathDocumentBaseIterator { private XPathDocumentNavigator end; private string localName, namespaceUri; private bool matchSelf; ////// Create an iterator that ranges over all element descendants of "root" having the specified QName. /// public XPathDocumentElementDescendantIterator(XPathDocumentNavigator root, string name, string namespaceURI, bool matchSelf) : base(root) { if (namespaceURI == null) throw new ArgumentNullException("namespaceURI"); this.localName = root.NameTable.Get(name); this.namespaceUri = namespaceURI; this.matchSelf = matchSelf; // Find the next non-descendant node that follows "root" in document order if (root.NodeType != XPathNodeType.Root) { this.end = new XPathDocumentNavigator(root); this.end.MoveToNonDescendant(); } } ////// Create a new iterator that is a copy of "iter". /// public XPathDocumentElementDescendantIterator(XPathDocumentElementDescendantIterator iter) : base(iter) { this.end = iter.end; this.localName = iter.localName; this.namespaceUri = iter.namespaceUri; this.matchSelf = iter.matchSelf; } ////// Create a copy of this iterator. /// public override XPathNodeIterator Clone() { return new XPathDocumentElementDescendantIterator(this); } ////// Position the iterator to the next descendant. /// public override bool MoveNext() { if (this.matchSelf) { this.matchSelf = false; if (this.ctxt.IsElementMatch(this.localName, this.namespaceUri)) { this.pos++; return true; } } if (!this.ctxt.MoveToFollowing(this.localName, this.namespaceUri, this.end)) return false; this.pos++; return true; } } ////// Iterate over all content descendants with a particular XPathNodeType. /// internal class XPathDocumentKindDescendantIterator : XPathDocumentBaseIterator { private XPathDocumentNavigator end; private XPathNodeType typ; private bool matchSelf; ////// Create an iterator that ranges over all content descendants of "root" having the specified XPathNodeType. /// public XPathDocumentKindDescendantIterator(XPathDocumentNavigator root, XPathNodeType typ, bool matchSelf) : base(root) { this.typ = typ; this.matchSelf = matchSelf; // Find the next non-descendant node that follows "root" in document order if (root.NodeType != XPathNodeType.Root) { this.end = new XPathDocumentNavigator(root); this.end.MoveToNonDescendant(); } } ////// Create a new iterator that is a copy of "iter". /// public XPathDocumentKindDescendantIterator(XPathDocumentKindDescendantIterator iter) : base(iter) { this.end = iter.end; this.typ = iter.typ; this.matchSelf = iter.matchSelf; } ////// Create a copy of this iterator. /// public override XPathNodeIterator Clone() { return new XPathDocumentKindDescendantIterator(this); } ////// Position the iterator to the next descendant. /// public override bool MoveNext() { if (this.matchSelf) { this.matchSelf = false; if (this.ctxt.IsKindMatch(this.typ)) { this.pos++; return true; } } if (!this.ctxt.MoveToFollowing(this.typ, this.end)) return false; this.pos++; return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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