src/storage/Index.cxx

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by www.databasecache.com                           *
   3  *   Contact: praba_tuty@databasecache.com                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15   ***************************************************************************/
  16 #include<Index.h>
  17 #include<Allocator.h>
  18 #include<Database.h>
  19 #include<Debug.h>
  20
  21 HashIndex* Index::hIdx = NULL;
  22 TreeIndex* Index::tIdx = NULL;
  23 TrieIndex* Index::iIdx = NULL;
  24 long Index::usageCount = 0;
  25
  26 Index* Index::getIndex(IndexType type)
  27 {
  28     if (type == hashIndex)
  29     {
  30         if (NULL == hIdx) hIdx = new HashIndex();
  31         return hIdx;
  32     }else if (type == treeIndex) {
  33         if (NULL == tIdx) tIdx = new TreeIndex();
  34         return tIdx;
  35     }else if (type == trieIndex) {
  36         if (NULL == iIdx) iIdx = new TrieIndex();
  37         return iIdx;
  38     }
  39     return NULL;
  40 }
  41 void Index::destroy()
  42 {
  43      usageCount--;
  44      if(!usageCount) {
  45         if(!hIdx) { delete hIdx; hIdx=NULL; }
  46         if(!tIdx) { delete tIdx; tIdx=NULL; }
  47         if(!iIdx) { delete tIdx; iIdx=NULL; }
  48      }
  49 }
  50