src/pkg/YQPkgSelMapper.h

   1 /*---------------------------------------------------------------------\
   2 |                                                                      |
   3 |                      __   __    ____ _____ ____                      |
   4 |                      \ \ / /_ _/ ___|_   _|___ \                     |
   5 |                       \ V / _` \___ \ | |   __) |                    |
   6 |                        | | (_| |___) || |  / __/                     |
   7 |                        |_|\__,_|____/ |_| |_____|                    |
   8 |                                                                      |
   9 |                               core system                            |
  10 |                                                        (C) SuSE GmbH |
  11 \----------------------------------------------------------------------/
  12
  13   File:         YQPkgSelMapper.h
  14
  15   Author:       Stefan Hundhammer <sh@suse.de>
  16
  17 /-*/
  18
  19
  20 #ifndef YQPkgSelMapper_h
  21 #define YQPkgSelMapper_h
  22
  23 #include "YQZypp.h"
  24 #include <map>
  25
  26
  27
  28 /**
  29  * Mapping from ZyppPkg to the correspoinding ZyppSel.
  30  *
  31  * All instances of this class share the same cache. The cache remains alive as
  32  * long as any instance of this class exists.
  33  **/
  34 class YQPkgSelMapper
  35 {
  36 public:
  37
  38     /**
  39      * Constructor. Builds a cache, if necessary.
  40      **/
  41     YQPkgSelMapper();
  42
  43     /**
  44      * Destructor. Clears the cache if this was the last YQPkgSelMapper
  45      * (i.e. if refCount() reaches 0)
  46      **/
  47     virtual ~YQPkgSelMapper();
  48
  49     /**
  50      * Find the corresponding ZyppSel to a ZyppPkg.
  51      * Returns 0 if there is no corresponding ZyppSel.
  52      **/
  53
  54     ZyppSel findZyppSel( ZyppPkg pkg );
  55
  56     /**
  57      * Reference count - indicates how many instances of this class are alive
  58      * right now.
  59      **/
  60     static int refCount() { return _refCount; }
  61
  62     /**
  63      * Rebuild the shared cache. This is expensive. Call this only when the
  64      * ZyppPool has changed, i.e. after installation sources were added or
  65      * removed.
  66      *
  67      * Since the cache is shared, this affects all instances of this class.
  68      **/
  69     void rebuildCache();
  70
  71
  72 protected:
  73
  74     typedef std::map<ZyppPkg, ZyppSel>          Cache;
  75     typedef std::pair<ZyppPkg, ZyppSel>         CachePair;
  76     typedef Cache::iterator                     CacheIterator;
  77
  78     static int          _refCount;
  79     static Cache        _cache;
  80 };
  81
  82
  83
  84 #endif // YQPkgSelMapper_h