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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 1 and Inria Bordeaux - Sud Ouest
*
* 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"
DOUBLEPLUGINOFGROUP(NodeMetric,"Node","David Auber","20/12/1999","Alpha","1.0","Tree");
using namespace std;
using namespace tlp;
//====================================================================
NodeMetric::NodeMetric(const tlp::PropertyContext &context):DoubleAlgorithm(context)
{}
// structure below is used to implement dfs loop
struct dfsStruct {
node current;
Iterator<node>* outNodes;
double result;
dfsStruct() {}
dfsStruct(node n, Iterator<node>* nodes):
current(n), outNodes(nodes), result(1.0) {}
};
//=======================================================================
// original recursive algorithm
/*double NodeMetric::getNodeValue(const tlp::node n) {
if (doubleResult->getNodeValue(n)!=0)
return doubleResult->getNodeValue(n);
double result = 1;
node _n;
forEach(_n, graph->getOutNodes(n))
result += getNodeValue(_n);
doubleResult->setNodeValue(n, result);
return result;
}*/
//=======================================================================
double NodeMetric::getNodeValue(tlp::node current) {
double value = doubleResult->getNodeValue(current);
if (value != 0.0)
return value;
// dfs loop
stack<dfsStruct> dfsLevels;
Iterator<node>* outNodes = graph->getOutNodes(current);
dfsStruct dfsParams(current, outNodes);
double result = 1.0;
dfsLevels.push(dfsParams);
while(!dfsLevels.empty()) {
while (outNodes->hasNext()) {
node neighbour = outNodes->next();
value = doubleResult->getNodeValue(neighbour);
// compute result
if (value != 0.0)
result += value;
else {
// store result for current
dfsLevels.top().result = result;
// push new dfsParams on stack
current = dfsParams.current = neighbour;
outNodes = dfsParams.outNodes = graph->getOutNodes(neighbour);
result = dfsParams.result = 1.0;
dfsLevels.push(dfsParams);
// and go deeper
break;
}
}
if (outNodes->hasNext())
// new dfsParams has been pushed on stack
continue;
// save current result
doubleResult->setNodeValue(current, result);
// 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 result if any
dfsParams.result += result;
result = dfsParams.result;
}
return result;
}
//====================================================================
bool NodeMetric::run() {
doubleResult->setAllEdgeValue(0);
doubleResult->setAllNodeValue(0);
node n;
forEach(n, graph->getNodes()) {
doubleResult->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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