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/* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com */
using System;
using System.Collections;
using Db4objects.Db4o.Internal.Btree;
namespace Db4objects.Db4o.Internal.Btree
{
public abstract class AbstractBTreeRangeIterator : IEnumerator
{
private readonly BTreeRangeSingle _range;
private BTreePointer _cursor;
private BTreePointer _current;
public AbstractBTreeRangeIterator(BTreeRangeSingle range)
{
_range = range;
_cursor = range.First();
}
public virtual bool MoveNext()
{
if (ReachedEnd(_cursor))
{
_current = null;
return false;
}
_current = _cursor;
_cursor = _cursor.Next();
return true;
}
public virtual void Reset()
{
_cursor = _range.First();
}
protected virtual BTreePointer CurrentPointer()
{
if (null == _current)
{
throw new InvalidOperationException();
}
return _current;
}
private bool ReachedEnd(BTreePointer cursor)
{
if (cursor == null)
{
return true;
}
if (_range.End() == null)
{
return false;
}
return _range.End().Equals(cursor);
}
public abstract object Current
{
get;
}
}
}
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