/* Copyright (C) 2008 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "Engine.h"
#include "WalkDeferred.h"

WalkDeferred::WalkDeferred(DeferredIndex *deferredIdx, Transaction *transaction, int flags, IndexKey *lower, IndexKey *upper) 
	: IndexWalker(deferredIdx->index, transaction, flags)
{
	deferredIndex = deferredIdx;
	walker.initialize(deferredIndex, lower, flags);
	node = NULL;
}

WalkDeferred::~WalkDeferred(void)
{
	deferredIndex->release();
}

Record* WalkDeferred::getNext(bool lockForUpdate)
{
	for (;;)
		{
		node = walker.next();
		
		if (!node)
			{
			currentRecord = NULL;
			return NULL;
			}

		key = node->key;
		keyLength = node->keyLength;
		recordNumber = node->recordNumber;
		
		if ( (currentRecord = getValidatedRecord(recordNumber, lockForUpdate)) )
			return currentRecord;
		}
}
