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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 "PathLengthMetric.h"
DOUBLEPLUGINOFGROUP(PathLengthMetric,"Path Length","David Auber","15/02/2001","Alpha","1.0","Tree");
using namespace std;
using namespace tlp;
//=======================================
PathLengthMetric::PathLengthMetric(const tlp::PropertyContext &context):DoubleAlgorithm(context) {
// Leaf metric needed
addDependency<DoubleAlgorithm>("Leaf", "1.0");
}
// 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(0.0) {}
};
//=======================================
// original recursive algorithm
/*double PathLengthMetric::getNodeValue(const tlp::node n) {
if (graph->outdeg(n)==0) return 0.0;
if (doubleResult->getNodeValue(n) > 0.1)
return doubleResult->getNodeValue(n);
double result=0;
node child;
forEach(child, graph->getOutNodes(n)) {
result += getNodeValue(child);
}
result += leafMetric->getNodeValue(n);
doubleResult->setNodeValue(n, result);
return result;
}*/
//=======================================================================
double PathLengthMetric::getNodeValue(tlp::node current) {
if (graph->outdeg(current) == 0) return 0.0;
double value = doubleResult->getNodeValue(current);
if (value > 0.1)
return value;
// dfs loop
stack<dfsStruct> dfsLevels;
Iterator<node>* outNodes = graph->getOutNodes(current);
dfsStruct dfsParams(current, outNodes);
double result = 0.0;
dfsLevels.push(dfsParams);
while(!dfsLevels.empty()) {
while (outNodes->hasNext()) {
node neighbour = outNodes->next();
value = doubleResult->getNodeValue(neighbour);
// compute result
if (value > 0.1)
result += value;
else {
outNodes = graph->getOutNodes(neighbour);
if (outNodes->hasNext()) {
// store result for current
dfsLevels.top().result = result;
// push new dfsParams on stack
current = dfsParams.current = neighbour;
dfsParams.outNodes = outNodes;
result = dfsParams.result = 0.0;
dfsLevels.push(dfsParams);
// and go deeper
break;
}
else {
delete outNodes;
outNodes = dfsParams.outNodes;
}
}
}
if (outNodes->hasNext())
// new dfsParams has been pushed on stack
continue;
result += leafMetric->getNodeValue(current);
// 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 PathLengthMetric::run() {
doubleResult->setAllNodeValue(0);
doubleResult->setAllEdgeValue(0);
leafMetric = new DoubleProperty(graph);
string erreurMsg;
if (!graph->computeProperty("Leaf", leafMetric, erreurMsg)) {
cerr << erreurMsg << endl;
return false;
}
node _n;
forEach(_n, graph->getNodes())
getNodeValue(_n);
delete leafMetric;
return true;
}
//=======================================
bool PathLengthMetric::check(std::string &erreurMsg) {
if (AcyclicTest::isAcyclic(graph))
return true;
else {
erreurMsg="The Graph must be acyclic";
return false;
}
}
//=======================================
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