119 lines
2.6 KiB
C#
119 lines
2.6 KiB
C#
//
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// System.Xml.XPath.XPathNodeIterator
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//
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// Author:
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// Jason Diamond (jason@injektilo.org)
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//
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// (C) 2002 Jason Diamond http://injektilo.org/
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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namespace System.Xml.XPath
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{
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public abstract class XPathNodeIterator : ICloneable, IEnumerable
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{
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private int _count = -1;
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#region Constructor
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protected XPathNodeIterator ()
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{
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}
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#endregion
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#region Properties
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public virtual int Count
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{
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get
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{
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if (_count == -1)
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{
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// compute and cache the count
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XPathNodeIterator tmp = Clone ();
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while (tmp.MoveNext ())
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;
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_count = tmp.CurrentPosition;
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}
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return _count;
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}
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}
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public abstract XPathNavigator Current { get; }
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public abstract int CurrentPosition { get; }
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#endregion
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#region Methods
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public abstract XPathNodeIterator Clone ();
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object ICloneable.Clone ()
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{
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return Clone ();
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}
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public virtual IEnumerator GetEnumerator ()
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{
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return new XPathNodeIteratorEnumerator (this);
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}
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public abstract bool MoveNext ();
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#endregion
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struct XPathNodeIteratorEnumerator : IEnumerator
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{
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XPathNodeIterator source;
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XPathNavigator current;
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public XPathNodeIteratorEnumerator (XPathNodeIterator source)
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{
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this.source = source.Clone ();
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current = null;
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}
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public bool MoveNext ()
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{
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if (!source.MoveNext ())
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return false;
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current = source.Current.Clone ();
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return true;
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}
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public object Current {
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get { return current; }
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}
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public void Reset ()
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{
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throw new NotSupportedException ();
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}
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}
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}
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}
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