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Viewing changes to contrib/Sharpen/Sharpen/EnumeratorWrapper.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2011-06-27 17:03:13 UTC
  • mto: (1.8.1 upstream)
  • mto: This revision was merged to the branch mainline in revision 54.
  • Revision ID: james.westby@ubuntu.com-20110627170313-6cvz3s19x6e9hqe9
Import upstream version 2.5.92+dfsg

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contrib/Sharpen/Sharpen/EnumeratorWrapper.cs
 
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namespace Sharpen
 
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{
 
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        using System;
 
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        using System.Collections.Generic;
 
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        internal class EnumeratorWrapper<T> : Iterator<T>
 
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        {
 
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                object collection;
 
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                IEnumerator<T> e;
 
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                T lastVal;
 
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                bool more;
 
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                bool copied;
 
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                public EnumeratorWrapper (object collection, IEnumerator<T> e)
 
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                {
 
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                        this.e = e;
 
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                        this.collection = collection;
 
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                        this.more = e.MoveNext ();
 
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                }
 
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                public override bool HasNext ()
 
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                {
 
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                        return this.more;
 
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                }
 
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                public override T Next ()
 
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                {
 
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                        if (!more)
 
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                                throw new NoSuchElementException ();
 
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                        lastVal = e.Current;
 
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                        more = e.MoveNext ();
 
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                        return lastVal;
 
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                }
 
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                public override void Remove ()
 
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                {
 
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                        ICollection<T> col = this.collection as ICollection<T>;
 
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                        if (col == null) {
 
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                                throw new NotSupportedException ();
 
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                        }
 
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                        if (more && !copied) {
 
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                                // Read the remaining elements, since the current enumerator
 
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                                // will be invalid after removing the element
 
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                                List<T> remaining = new List<T> ();
 
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                                do {
 
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                                        remaining.Add (e.Current);
 
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                                } while (e.MoveNext ());
 
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                                e = remaining.GetEnumerator ();
 
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                                e.MoveNext ();
 
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                                copied = true;
 
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                        }
 
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                        col.Remove (lastVal);
 
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                }
 
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        }
 
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}