matrixgraph.h

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*                  This file is part of the program                         */
/*          GCG --- Generic Column Generation                                */
/*                  a Dantzig-Wolfe decomposition based extension            */
/*                  of the branch-cut-and-price framework                    */
/*         SCIP --- Solving Constraint Integer Programs                      */
/*                                                                           */
/* Copyright (C) 2010-2021 Operations Research, RWTH Aachen University       */
/*                         Zuse Institute Berlin (ZIB)                       */
/*                                                                           */
/* This program 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.                    */
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/* 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 Lesser General Public License for more details.                       */
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/* You should have received a copy of the GNU Lesser General Public License  */
/* along with this program; if not, write to the Free Software               */
/* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.*/
/*                                                                           */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
/**@file   matrixgraph.h
 * @brief  miscellaneous matrixgraph methods for structure detection
 * @author Martin Bergner
 * @author Annika Thome
 */
 
/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
 
 
#ifndef GCG_MATRIXGRAPH_H_
#define GCG_MATRIXGRAPH_H_
#include "objscip/objscip.h"
#include "tclique/tclique.h"
#include "weights.h"
#include "pub_decomp.h"
#include "bridge.h"
#include "graph_interface.h"
#include "class_partialdecomp.h"
#include "class_detprobdata.h"
#include <exception>
#include <vector>
#include <string>
 
namespace gcg {
 
template <class T>
class MatrixGraph {
public:
   std::string name;
protected:
   SCIP* scip_;
   int nconss;
   int nvars;
   int dummynodes;
   Weights weights;
   GraphInterface *graphiface;
   int nnonzeroes;
 
public:
   /** Constructor */
   MatrixGraph(
      SCIP*                 scip,              /**< SCIP data structure */
      Weights               w                  /**< weights for the given graph */
   );
 
   /** Destructor */
   virtual ~MatrixGraph();
 
   /** writes the graph to the given file.
    *  The format is graph dependent
    */
   virtual SCIP_RETCODE writeToFile(
      int                fd,                 /**< file descriptor where the graph should be written to */
      SCIP_Bool          writeweights        /**< whether to write weights */
      )
   {
      SCIP_CALL(graphiface->writeToFile(fd, writeweights) );
      return SCIP_OKAY;
   }
 
 
   virtual SCIP_RETCODE createDecompFromPartition(
      DEC_DECOMP**       decomp              /**< decomposition structure to generate */
   )
   {
      return SCIP_ERROR;
   }
 
 
 
   /** amplifies a partialdec by dint of a graph created with open constraints and open variables of the partialdec */
   virtual SCIP_RETCODE createPartialdecFromPartition(
      PARTIALDECOMP*      oldpartialdec,            /**< partialdec which should be amplifies */
      PARTIALDECOMP**     firstpartialdec,          /**< pointer to buffer the new partialdec amplified by dint of the graph */
      PARTIALDECOMP**     secondpartialdec,         /**< pinter to buffer the new partialdec whose border is amplified by dint of the graph */
      DETPROBDATA*        detprobdata               /**< detection process information and data */
      )
   {
      return SCIP_ERROR;
   }
 
   /**
    * reads the partition from the given file.
    * The format is graph dependent. The default is a file with one line for each node a
    */
   virtual SCIP_RETCODE readPartition(
      const char*        filename            /**< filename where the partition is stored */
   )
   {
      SCIP_CALL( graphiface->readPartition(filename) );
      return SCIP_OKAY;
   }
 
   /** set the number of dummy nodes */
   void setDummynodes(int dummynodes_)
   {
      dummynodes = dummynodes_;
   }
 
   int getDummynodes() const
   {
      return dummynodes;
   }
 
   /** return a partition of the nodes */
   virtual std::vector<int> getPartition()
   {
      return graphiface->getPartition();
   }
 
   virtual SCIP_RETCODE createFromMatrix(
      SCIP_CONS**           conss,              /**< constraints for which graph should be created */
      SCIP_VAR**            vars,               /**< variables for which graph should be created */
      int                   nconss_,             /**< number of constraints */
      int                   nvars_               /**< number of variables */
      ) { return SCIP_ERROR; }
 
   /** creates a graph with open constraints and open variables of the partialdec */
   virtual SCIP_RETCODE createFromPartialMatrix(
      DETPROBDATA*           detprobdata,
      PARTIALDECOMP*               partialdec
      ) { return SCIP_ERROR; }
 
 
   virtual int getNNonzeroes() const
   {
      return nnonzeroes;
   }
};
 
}
 
#endif