apt-pkg/pkgsystem.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: pkgsystem.cc,v 1.3 2004/02/27 00:43:16 mdz Exp $
   4 /* ######################################################################
   5
   6    System - Abstraction for running on different systems.
   7
   8    Basic general structure..
   9
  10    ##################################################################### */
  11                                                                         /*}}}*/
  12 // Include Files                                                        /*{{{*/
  13 #include<config.h>
  14
  15 #include <apt-pkg/debsystem.h>
  16 #include <apt-pkg/pkgsystem.h>
  17 #include <apt-pkg/macros.h>
  18
  19 #include <map>
  20 #include <cassert>
  21 #include <cstring>
  22                                                                         /*}}}*/
  23
  24 pkgSystem *_system = 0;
  25 static pkgSystem *SysList[10];
  26 pkgSystem **pkgSystem::GlobalList = SysList;
  27 unsigned long pkgSystem::GlobalListLen = 0;
  28
  29 class APT_HIDDEN pkgSystemPrivate                                       /*{{{*/
  30 {
  31 public:
  32    typedef decltype(pkgCache::Version::ID) idtype;
  33    std::map<idtype,idtype> idmap;
  34    pkgSystemPrivate() {}
  35 };
  36                                                                         /*}}}*/
  37 // System::pkgSystem - Constructor                                      /*{{{*/
  38 // ---------------------------------------------------------------------
  39 /* Add it to the global list.. */
  40 pkgSystem::pkgSystem(char const * const label, pkgVersioningSystem * const vs) :
  41    Label(label), VS(vs), d(new pkgSystemPrivate())
  42 {
  43    assert(GlobalListLen < sizeof(SysList)/sizeof(*SysList));
  44    SysList[GlobalListLen] = this;
  45    ++GlobalListLen;
  46 }
  47                                                                         /*}}}*/
  48 // System::GetSystem - Get the named system                             /*{{{*/
  49 // ---------------------------------------------------------------------
  50 /* */
  51 APT_PURE pkgSystem *pkgSystem::GetSystem(const char *Label)
  52 {
  53    for (unsigned I = 0; I != GlobalListLen; I++)
  54       if (strcmp(SysList[I]->Label,Label) == 0)
  55          return SysList[I];
  56    return 0;
  57 }
  58                                                                         /*}}}*/
  59 bool pkgSystem::MultiArchSupported() const                              /*{{{*/
  60 {
  61    debSystem const * const deb = dynamic_cast<debSystem const *>(this);
  62    if (deb != NULL)
  63       return deb->SupportsMultiArch();
  64    return true;
  65 }
  66                                                                         /*}}}*/
  67 std::vector<std::string> pkgSystem::ArchitecturesSupported() const      /*{{{*/
  68 {
  69    debSystem const * const deb = dynamic_cast<debSystem const *>(this);
  70    if (deb != NULL)
  71       return deb->SupportedArchitectures();
  72    return {};
  73 }
  74                                                                         /*}}}*/
  75 // pkgSystem::Set/GetVersionMapping - for internal/external communcation/*{{{*/
  76 void pkgSystem::SetVersionMapping(map_id_t const in, map_id_t const out)
  77 {
  78    if (in == out)
  79       return;
  80    d->idmap.emplace(in, out);
  81 }
  82 map_id_t pkgSystem::GetVersionMapping(map_id_t const in) const
  83 {
  84    auto const o = d->idmap.find(in);
  85    return (o == d->idmap.end()) ? in : o->second;
  86 }
  87                                                                         /*}}}*/
  88
  89 pkgSystem::~pkgSystem() {}