XmlIteratorNodeList.cs :  » 2.6.4-mono-.net-core » System.Xml » System » Xml » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Xml 
System.Xml » System » Xml » XmlIteratorNodeList.cs
//
// System.Xml.XmlIteratorNodeList
//
// Author:
//  Atsushi Enomoto <atsushi@ximian.com>
//
// (C) 2006 Novell Inc.
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Collections;
using System.Xml.XPath;

namespace System.Xml{
  internal class XmlIteratorNodeList : XmlNodeList
  {
    XPathNodeIterator source;
    XPathNodeIterator iterator;
    ArrayList list;
    bool finished;

    #region Constructors

    public XmlIteratorNodeList (XPathNodeIterator iter)
    {
      source = iter;
      iterator = iter.Clone ();
      list = new ArrayList ();
    }

    #endregion

    #region Properties

    public override int Count {
      get {
/*
        // The performance on Count depends on the 
        // iterator which is actually used. In some
        // iterators, getting iterator.Count is much
        // faster.

        // With (current) implementation in general,
        // those iterators that requires sorting is
        // likely to have already-computed arrays, so
        // for them getting Count does not impact on
        // performance.
        
        // But by default, getting iterator.Count means
        // it internally iterates all the nodes. That
        // might result in duplicate iteration (so
        // ineffective). So here I decided that it
        // just collects all the nodes to the list.

        if (!finished) {
          BaseIterator iter = iterator as BaseIterator;
          if (iter != null && iter.ReverseAxis || iter is SlashIterator)
            return iter.Count;

          while (iterator.MoveNext ())
            list.Add (((IHasXmlNode) iterator.Current).GetNode ());
          finished = true;
        }
        return list.Count;
*/
        // anyways such code that uses
        // XmlNodeList.Count already gives up 
        // performance. Also, storing things in the
        // list causes extra memory consumption.
        return iterator.Count;
      }
    }

    #endregion

    #region Methods

    public override IEnumerator GetEnumerator ()
    {
      if (finished)
        return list.GetEnumerator ();
      else
        return new XPathNodeIteratorNodeListIterator (source);
//        return new XPathNodeIteratorNodeListIterator2 (this);
    }

    public override XmlNode Item (int index)
    {
      if (index < 0)
        return null;
      if (index < list.Count)
        return (XmlNode) list [index];
      index++;
      while (iterator.CurrentPosition < index) {
        if (!iterator.MoveNext ()) {
          finished = true;
          return null;
        }
        list.Add (((IHasXmlNode) iterator.Current).GetNode ());
      }
      return (XmlNode) list [index - 1];
    }

    #endregion

    class XPathNodeIteratorNodeListIterator : IEnumerator
    {
      XPathNodeIterator iter;
      XPathNodeIterator source;
      public XPathNodeIteratorNodeListIterator (XPathNodeIterator source)
      {
        this.source = source;
        Reset ();
      }

      public bool MoveNext ()
      {
        return iter.MoveNext ();
      }

      public object Current {
        get { return ((IHasXmlNode) iter.Current).GetNode (); }
      }

      public void Reset ()
      {
        iter = source.Clone ();
      }
    }

    /*
    class XPathNodeIteratorNodeListIterator2 : IEnumerator
    {
      int current = -1;
      XmlIteratorNodeList source;

      public XPathNodeIteratorNodeListIterator2 (XmlIteratorNodeList source)
      {
        this.source = source;
      }

      public bool MoveNext ()
      {
        return source [++current] != null;
      }

      public object Current {
        get { return source [current]; }
      }

      public void Reset ()
      {
        current = -1;
      }
    }
    */
  }
}
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