159 lines
3.1 KiB
C
159 lines
3.1 KiB
C
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/*
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This file is part of SECONDO.
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Copyright (C) 2011, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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2012, July Simone Jandt
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1. Includes
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*/
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#ifndef PQMANAGEMENT_H
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#define PQMANAGEMENT_H
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#include <ostream>
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#include "../../Tools/Flob/DbArray.h"
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#include "../../Tools/Flob/DBATree.h"
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#include "JTreeElement.h"
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namespace jnetwork{
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/*
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1 class ~PQManagement~
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Manages the priority queue and the visited sections within shortest path search
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resp. network distance computation. It consists of two DbArrays to avoid
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main memory limitations. The first DbArray contains the visited Junctions and
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the second DbArray the priority queue. The two DbArrays are connected by the
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pqindex value stored in the first one for each pqentry. If the junction is not
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longer in the priority queue this indexentry is set to -1.
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*/
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class PQManagement
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{
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/*
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1.1 public Methods of class ~PQManagement~
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*/
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public:
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/*
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1.1.1 Constructors and Deconstructors
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*/
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PQManagement();
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~PQManagement();
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/*
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1.1.1 Insert
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Inserts the JPQEntry in the priority queue if the end junction of the new entry
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has not been used before, respectively if it is still in the priority queue and
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the new distance is smaller than the old one.
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Otherwise we ignore the new values.
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*/
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void Insert(const JPQEntry& e);
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/*
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1.1.1 GetAndDeleteMin
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Returns the priority queue entry with the smallest priority value and removes
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it from the priority queue.
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*/
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JPQEntry* GetAndDeleteMin();
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/*
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1.1.1 IsEmpty
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Returns true if pq is empty false elsewhere.
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*/
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bool IsEmpty() const;
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inline int Size() const{
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return sizePQ;
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}
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/*
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1.1.1 InsertJunctionVisited
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Inserts the given Junction as visited junction without inserting it into pqueue.
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Used to mark junctions visited which are used in initialization phase of the
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priority queue, and therefore do not become members of priority queue
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themselves.
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*/
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void InsertJunctionAsVisited(const JPQEntry juncE);
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/*
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1.1.1 Destroy
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Marks the DbArrays to be removable from harddisk on delete.
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*/
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void Destroy();
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/*
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1.1.1 Print
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*/
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std::ostream& Print(std::ostream& os) const;
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/*
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1.1 Private definitions of class ~PQManagement~
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*/
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private:
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/*
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1.1.1 Attributes
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*/
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dbatree::DBATree<VisitedJunction, VisitedJunctionComparator> visited;
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DbArray<JPQEntry> pq;
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int sizePQ;
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void blowUp(int index);
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void sink(int index);
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};
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} // end of namespace jnetwork
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/*
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1 Overload output operator
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*/
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std::ostream& operator<<(std::ostream& os, const jnetwork::PQManagement& dir);
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#endif // PQMANAGEMENT_H
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