apt-pkg/pkgrecords.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: pkgrecords.cc,v 1.8 2003/09/02 04:52:16 mdz Exp $
   4 /* ######################################################################
   5
   6    Package Records - Allows access to complete package description records
   7                      directly from the file.
   8
   9    ##################################################################### */
  10                                                                         /*}}}*/
  11 // Include Files                                                        /*{{{*/
  12 #ifdef __GNUG__
  13 #pragma implementation "apt-pkg/pkgrecords.h"
  14 #endif
  15 #include <apt-pkg/pkgrecords.h>
  16 #include <apt-pkg/indexfile.h>
  17 #include <apt-pkg/error.h>
  18 #include <apt-pkg/configuration.h>
  19
  20 #include <apti18n.h>
  21                                                                         /*}}}*/
  22
  23 // Records::pkgRecords - Constructor                                    /*{{{*/
  24 // ---------------------------------------------------------------------
  25 /* This will create the necessary structures to access the status files */
  26 pkgRecords::pkgRecords(pkgCache &Cache) : Cache(Cache), Files(0)
  27 {
  28    Files = new Parser *[Cache.HeaderP->PackageFileCount];
  29    memset(Files,0,sizeof(*Files)*Cache.HeaderP->PackageFileCount);
  30
  31    for (pkgCache::PkgFileIterator I = Cache.FileBegin();
  32         I.end() == false; I++)
  33    {
  34       const pkgIndexFile::Type *Type = pkgIndexFile::Type::GetType(I.IndexType());
  35       if (Type == 0)
  36       {
  37          _error->Error(_("Index file type '%s' is not supported"),I.IndexType());
  38          return;
  39       }
  40
  41       Files[I->ID] = Type->CreatePkgParser(I);
  42       if (Files[I->ID] == 0)
  43          return;
  44    }
  45    // We store that to make sure that the destructor won't segfault,
  46    // even if the Cache object was destructed before this instance.
  47    PackageFileCount = Cache.HeaderP->PackageFileCount;
  48 }
  49                                                                         /*}}}*/
  50 // Records::~pkgRecords - Destructor                                    /*{{{*/
  51 // ---------------------------------------------------------------------
  52 /* */
  53 pkgRecords::~pkgRecords()
  54 {
  55    for (unsigned I = 0; I != PackageFileCount; I++)
  56       delete Files[I];
  57    delete [] Files;
  58 }
  59                                                                         /*}}}*/
  60 // Records::Lookup - Get a parser for the package version file          /*{{{*/
  61 // ---------------------------------------------------------------------
  62 /* */
  63 pkgRecords::Parser &pkgRecords::Lookup(pkgCache::VerFileIterator const &Ver)
  64 {
  65    Files[Ver.File()->ID]->Jump(Ver);
  66    return *Files[Ver.File()->ID];
  67 }
  68                                                                         /*}}}*/
  69 // Records::Lookup - Get a parser for the package description file      /*{{{*/
  70 // ---------------------------------------------------------------------
  71 /* */
  72 pkgRecords::Parser &pkgRecords::Lookup(pkgCache::DescFileIterator const &Desc)
  73 {
  74    Files[Desc.File()->ID]->Jump(Desc);
  75    return *Files[Desc.File()->ID];
  76 }
  77                                                                         /*}}}*/