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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.
*
*/
#ifndef TULIP_ACYCLICITY_TEST_H
#define TULIP_ACYCLICITY_TEST_H
#include <vector>
#include <tulip/Observable.h>
#include <tulip/MutableContainer.h>
#include <tulip/Graph.h>
namespace tlp {
class BooleanProperty;
/**
* @ingroup Checks
*
* @brief Stores all the added information on self loops.
*
* Self loops are removed by adding two nodes and three edges.
*
* These are stores here, along with the old self looping edge.
*
* From Wikipedia: "A directed acyclic graph (DAG), is a directed graph with no directed cycles."
**/
struct SelfLoops {
public:
SelfLoops(node n1,node n2,edge e1, edge e2,edge e3,edge old):
n1(n1),n2(n2),e1(e1),e2(e2),e3(e3),old(old) {
}
node n1,n2;
edge e1,e2,e3,old;
};
/**
* @ingroup Checks
*
* @brief This class provides tests for acyclicity on a graph.
* Results are cached in a map of graphs and result.
* This class observes the graphs that have been tested to remove the result from this graph if it is modified.
* This forces the use of the singleton pattern instead of simply using static functions/members.
**/
class TLP_SCOPE AcyclicTest : private Observable {
public:
/**
* @brief Checks whether the graph is acyclic or not.
* The result is cached so subsequent calls are in O(1).
*
* @param graph The graph on which to perform the acyclicity test.
* @return bool True if the graph is acyclic, false otherwise.
**/
static bool isAcyclic(const Graph *graph);
/**
* @brief Makes the graph acyclic by removing edges.
*
* @param graph The graph to make acyclic.
* @param reversed The edges that were reversed during the process.
* @param selfLoops Sets of two nodes and three edges that were added in stead of self loops.
* @return void
**/
static void makeAcyclic(Graph* graph, std::vector<edge> &reversed, std::vector<tlp::SelfLoops> &selfLoops);
/**
* @brief Returns whether the graph is acyclic.
* Collection of obstruction edges takes a bit of time, as iteration over the graph must continue even when it has been found cyclic.
*
* @param graph the graph to test for acyclicity
* @param obstructionEdges If not null, will be filled with edges that cause the graph to be cyclic. Defaults to 0.
* @return bool
**/
static bool acyclicTest(const Graph * graph, std::vector<edge> *obstructionEdges = NULL);
private:
AcyclicTest();
/**
* @brief Singleton instance of this class.
**/
static AcyclicTest * instance;
/**
* @brief Stored results for graphs. When a graph is updated, its entry is removed from the hashmap.
**/
TLP_HASH_MAP<const Graph*, bool> resultsBuffer;
//override of Observable::treatEvent to remove the cached result for a graph if it is modified.
virtual void treatEvent(const Event&);
};
}
#endif //TULIP_ACYCLICITY_TEST_H
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