projectionlist.c

数据挖掘经典的hierarchial clustering algorithm

/*
  ========================================================================
  DEVise Data Visualization Software
  (c) Copyright 1992-1996
  By the DEVise Development Group
  Madison, Wisconsin
  All Rights Reserved.
  ========================================================================

  Under no circumstances is this software to be copied, distributed,
  or altered in any way without prior permission from the DEVise
  Development Group.
*/

/*
  Implementation of ProjectionList class.
 */

/*
  $Id: ProjectionList.c,v 1.1 1996/06/17 19:14:56 wenger Exp $

  $Log: ProjectionList.c,v $
  Revision 1.1  1996/06/17 19:14:56  wenger
  Somehow the ProjectionList stuff never got committed before -- committing
  it now.

 */

#define _ProjectionList_c_

#include <stdio.h>

#include "ProjectionList.h"


#if !defined(lint) && defined(RCSID)
static char             rcsid[] = "$RCSfile: ProjectionList.c,v $ $Revision: 1.1 $ $State: Exp $";
#endif

static char *   srcFile = __FILE__;

/*------------------------------------------------------------------------------
 * function: ProjectionList::ProjectionList
 * ProjectionList constructor.
 */
ProjectionList::ProjectionList()
{
        _projCount = 0;
        _projList.proj.attrCount = 0;
        _projList.proj.attrList = NULL;
        _projList.next = NULL;
        _currentNodeP = NULL;
        _lastNodeP = &_projList;
}

/*------------------------------------------------------------------------------
 * function: ProjectionList::~ProjectionList
 * ProjectionList destructor.
 */
ProjectionList::~ProjectionList()
{
        ProjListNode *  nodeP = _projList.next;
        ProjListNode *  nextP;

        while (nodeP != NULL)
        {
                nextP = nodeP->next;
                delete nodeP->proj.attrList;
                delete nodeP;
                nodeP = nextP;
        }
}

/*------------------------------------------------------------------------------
 * function: ProjectionList::AddProjection
 * Adds a new projection to the projection list.
 */
DevStatus
ProjectionList::AddProjection(Projection &proj)
{
        DevStatus       result = StatusOk;
        ProjListNode *  nodeP = new ProjListNode;

        nodeP->proj.attrCount = proj.attrCount;
        nodeP->proj.attrList = proj.attrList;

        nodeP->next = NULL;
        _lastNodeP->next = nodeP;
        _lastNodeP = nodeP;

        _projCount++;

        return result;
}

/*------------------------------------------------------------------------------
 * function: ProjectionList::GetFirstProj
 * Gets the first projection in the projection list.
 */
Projection *
ProjectionList::GetFirstProj()
{
        _currentNodeP = _projList.next;

        return &_currentNodeP->proj;
}

/*------------------------------------------------------------------------------
 * function: ProjectionList::GetNextProj
 * Gets the next projection in the projection list (call GetFirstProj()
 * before calling GetNextProj()).
 */
Projection *
ProjectionList::GetNextProj()
{
        if (_currentNodeP != NULL)
        {
                _currentNodeP = _currentNodeP->next;
        }

        return &_currentNodeP->proj;
}

/*------------------------------------------------------------------------------
 * function: ProjectionList::GetProjCount
 * Gets the number of projections in the list.
 */
int
ProjectionList::GetProjCount()
{
        return _projCount;
}

/*============================================================================*/