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/**
*
* This file is part of Tulip (www.tulip-software.org)
*
* Authors: David Auber and the Tulip development Team
* from LaBRI, University of Bordeaux
*
* Tulip is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* Tulip 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.
*
*/
#include <stack>
#include "NodeMetric.h"
PLUGIN(NodeMetric)
using namespace std;
using namespace tlp;
//====================================================================
NodeMetric::NodeMetric(const tlp::PluginContext* context):DoubleAlgorithm(context) {
}
// structure below is used to implement dfs loop
struct dfsStruct {
node current;
Iterator<node>* outNodes;
double res;
dfsStruct(node n, Iterator<node>* nodes):
current(n), outNodes(nodes), res(1.0) {}
};
//=======================================================================
// original recursive algorithm
/*double NodeMetric::getNodeValue(const tlp::node n) {
if (result->getNodeValue(n)!=0)
return result->getNodeValue(n);
double res = 1;
node _n;
forEach(_n, graph->getOutNodes(n))
res += getNodeValue(_n);
result->setNodeValue(n, res);
return res;
}*/
//=======================================================================
double NodeMetric::getNodeValue(tlp::node current) {
double value = result->getNodeValue(current);
if (value != 0.0)
return value;
// dfs loop
stack<dfsStruct> dfsLevels;
Iterator<node>* outNodes = graph->getOutNodes(current);
dfsStruct dfsParams(current, outNodes);
double res = 1.0;
dfsLevels.push(dfsParams);
while(!dfsLevels.empty()) {
while (outNodes->hasNext()) {
node neighbour = outNodes->next();
value = result->getNodeValue(neighbour);
// compute res
if (value != 0.0)
res += value;
else {
// store res for current
dfsLevels.top().res = res;
// push new dfsParams on stack
current = dfsParams.current = neighbour;
outNodes = dfsParams.outNodes = graph->getOutNodes(neighbour);
res = dfsParams.res = 1.0;
dfsLevels.push(dfsParams);
// and go deeper
break;
}
}
if (outNodes->hasNext())
// new dfsParams has been pushed on stack
continue;
// save current res
result->setNodeValue(current, res);
// unstack current dfsParams
delete outNodes;
dfsLevels.pop();
if (dfsLevels.empty())
break;
// get dfsParams on top of dfsLevels
dfsParams = dfsLevels.top();
current = dfsParams.current;
outNodes = dfsParams.outNodes;
// update new current res if any
dfsParams.res += res;
res = dfsParams.res;
}
return res;
}
//====================================================================
bool NodeMetric::run() {
result->setAllEdgeValue(0);
result->setAllNodeValue(0);
node _n;
forEach(_n, graph->getNodes())
result->setNodeValue(_n,getNodeValue(_n));
return true;
}
//====================================================================
bool NodeMetric::check(std::string &erreurMsg) {
if (AcyclicTest::isAcyclic(graph)) {
erreurMsg="";
return true;
}
else {
erreurMsg="The graph must be acyclic.";
return false;
}
}
//====================================================================
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