qgschunklist_p.h

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/***************************************************************************
  qgschunklist_p.h
  --------------------------------------
  Date                 : July 2017
  Copyright            : (C) 2017 by Martin Dobias
  Email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSCHUNKLIST_P_H
#define QGSCHUNKLIST_P_H


//
//  W A R N I N G
//  -------------
//
// This file is not part of the QGIS API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//

class QgsChunkNode;

struct QgsChunkListEntry
{
  QgsChunkListEntry( QgsChunkNode *node )
    : chunk( node )
  {
  }

  QgsChunkListEntry *prev = nullptr;
  QgsChunkListEntry *next = nullptr;
  QgsChunkNode *chunk;   
};


class QgsChunkList
{
  public:
    QgsChunkList() = default;

    int trueCount() const;
    int count() const { return mCount; }

    QgsChunkListEntry *first() const { return mHead; }
    QgsChunkListEntry *last() const { return mTail; }
    bool isEmpty() const;

    void insertEntry( QgsChunkListEntry *entry, QgsChunkListEntry *next );

    void takeEntry( QgsChunkListEntry *entry );
    QgsChunkListEntry *takeFirst();
    QgsChunkListEntry *takeLast();

    void insertFirst( QgsChunkListEntry *entry );
    void insertLast( QgsChunkListEntry *entry );

  private:
    QgsChunkListEntry *mHead = nullptr;
    QgsChunkListEntry *mTail = nullptr;
    int mCount = 0;
};


#endif // QGSCHUNKLIST_P_H