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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* 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; either version 2 of the License, or *
* (at your option) any later version. *
* *
* 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., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include <util/functions.h>
#include "kclosestnodessearch.h"
#include "pack.h"
using namespace bt;
using namespace KNetwork;
namespace dht
{
typedef std::map<dht::Key,KBucketEntry>::iterator KNSitr;
KClosestNodesSearch::KClosestNodesSearch(const dht::Key & key,Uint32 max_entries)
: key(key),max_entries(max_entries)
{}
KClosestNodesSearch::~KClosestNodesSearch()
{}
void KClosestNodesSearch::tryInsert(const KBucketEntry & e)
{
// calculate distance between key and e
dht::Key d = dht::Key::distance(key,e.getID());
if (emap.size() < max_entries)
{
// room in the map so just insert
emap.insert(std::make_pair(d,e));
}
else
{
// now find the max distance
// seeing that the last element of the map has also
// the biggest distance to key (std::map is sorted on the distance)
// we just take the last
const dht::Key & max = emap.rbegin()->first;
if (d < max)
{
// insert if d is smaller then max
emap.insert(std::make_pair(d,e));
// erase the old max value
emap.erase(max);
}
}
}
void KClosestNodesSearch::pack(QByteArray & ba)
{
// make sure we do not writ to much
Uint32 max_items = ba.size() / 26;
Uint32 j = 0;
KNSitr i = emap.begin();
while (i != emap.end() && j < max_items)
{
PackBucketEntry(i->second,ba,j*26);
i++;
j++;
i++;
}
}
}
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