Source/cmListFileCache.cxx

   1 /*=========================================================================
   2
   3   Program:   Insight Segmentation & Registration Toolkit
   4   Module:    $RCSfile: cmListFileCache.cxx,v $
   5   Language:  C++
   6   Date:      $Date: 2002-04-11 21:02:10 $
   7   Version:   $Revision: 1.5 $
   8
   9   Copyright (c) 2002 Insight Consortium. All rights reserved.
  10   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
  11
  12      This software is distributed WITHOUT ANY WARRANTY; without even
  13      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  14      PURPOSE.  See the above copyright notices for more information.
  15
  16 =========================================================================*/
  17 #include "cmListFileCache.h"
  18 #include "cmSystemTools.h"
  19
  20
  21 cmListFileCache* cmListFileCache::Instance = 0;
  22
  23
  24 cmListFileCache* cmListFileCache::GetInstance()
  25 {
  26   if(!cmListFileCache::Instance)
  27     {
  28     cmListFileCache::Instance = new cmListFileCache;
  29     }
  30   return cmListFileCache::Instance;
  31 }
  32
  33
  34 void cmListFileCache::ClearCache()
  35 {
  36   delete cmListFileCache::Instance;
  37   cmListFileCache::Instance = 0;
  38 }
  39
  40
  41
  42 cmListFile* cmListFileCache::GetFileCache(const char* path)
  43 {
  44   ListFileMap::iterator sl = m_ListFileCache.find(path);
  45   if (sl == m_ListFileCache.end())
  46     {
  47     // if not already in the map, then parse and store the
  48     // file
  49     if(!this->CacheFile(path))
  50       {
  51       return 0;
  52       }
  53     sl = m_ListFileCache.find(path);
  54     if (sl == m_ListFileCache.end())
  55       {
  56       cmSystemTools::Error("Fatal error, in cmListFileCache CacheFile failed",
  57                            path);
  58       return 0;
  59       }
  60     }
  61   cmListFile& ret = sl->second;
  62   if(cmSystemTools::ModifiedTime(path) > ret.m_ModifiedTime )
  63     {
  64     if(!this->CacheFile(path))
  65       {
  66       return 0;
  67       }
  68     else
  69       {
  70       sl = m_ListFileCache.find(path);
  71       return &sl->second;
  72       }
  73     }
  74   return &ret;
  75 }
  76
  77
  78 bool cmListFileCache::CacheFile(const char* path)
  79 {
  80   if(!cmSystemTools::FileExists(path))
  81     {
  82     return false;
  83     }
  84
  85   std::ifstream fin(path);
  86   if(!fin)
  87     {
  88     cmSystemTools::Error("cmListFileCache: error can not open file ", path);
  89     return false;
  90     }
  91   std::string name;
  92   std::vector<std::string> arguments;
  93   cmListFile inFile;
  94   inFile.m_ModifiedTime = cmSystemTools::ModifiedTime(path);
  95   bool parseError;
  96   while ( fin )
  97     {
  98     cmListFileFunction inFunction;
  99     if(cmSystemTools::ParseFunction(fin,
 100                                     inFunction.m_Name,
 101                                     inFunction.m_Arguments,
 102                                     path, parseError))
 103       {
 104       inFile.m_Functions.push_back(inFunction);
 105       }
 106     if (parseError)
 107       {
 108       inFile.m_ModifiedTime = 0;
 109       }
 110     }
 111   m_ListFileCache[path] = inFile;
 112   return true;
 113 }