apt-pkg/orderlist.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Order List - Represents and Manipulates an ordered list of packages.
   6
   7    A list of packages can be ordered by a number of conflicting criteria
   8    each given a specific priority. Each package also has a set of flags
   9    indicating some useful things about it that are derived in the
  10    course of sorting. The pkgPackageManager class uses this class for
  11    all of it's installation ordering needs.
  12
  13    ##################################################################### */
  14                                                                         /*}}}*/
  15 #ifndef PKGLIB_ORDERLIST_H
  16 #define PKGLIB_ORDERLIST_H
  17
  18 #include <apt-pkg/pkgcache.h>
  19 #include <apt-pkg/cacheiterators.h>
  20 #include <apt-pkg/macros.h>
  21
  22 #include <string>
  23
  24 class pkgDepCache;
  25 class pkgOrderList : protected pkgCache::Namespace
  26 {
  27    void * const d;
  28    protected:
  29
  30    pkgDepCache &Cache;
  31    typedef bool (pkgOrderList::*DepFunc)(DepIterator D);
  32
  33    // These are the currently selected ordering functions
  34    DepFunc Primary;
  35    DepFunc Secondary;
  36    DepFunc RevDepends;
  37    DepFunc Remove;
  38
  39    // State
  40    Package **End;
  41    Package **List;
  42    Package **AfterEnd;
  43    std::string *FileList;
  44    DepIterator Loops[20];
  45    int LoopCount;
  46    int Depth;
  47    unsigned short *Flags;
  48    bool Debug;
  49
  50    // Main visit function
  51    APT_DEPRECATED bool VisitNode(PkgIterator Pkg) { return VisitNode(Pkg, "UNKNOWN"); };
  52    bool VisitNode(PkgIterator Pkg, char const* from);
  53    bool VisitDeps(DepFunc F,PkgIterator Pkg);
  54    bool VisitRDeps(DepFunc F,PkgIterator Pkg);
  55    bool VisitRProvides(DepFunc F,VerIterator Ver);
  56    bool VisitProvides(DepIterator Pkg,bool Critical);
  57
  58    // Dependency checking functions.
  59    bool DepUnPackCrit(DepIterator D);
  60    bool DepUnPackPreD(DepIterator D);
  61    bool DepUnPackPre(DepIterator D);
  62    bool DepUnPackDep(DepIterator D);
  63    bool DepConfigure(DepIterator D);
  64    bool DepRemove(DepIterator D);
  65
  66    // Analysis helpers
  67    bool AddLoop(DepIterator D);
  68    bool CheckDep(DepIterator D);
  69    bool DoRun();
  70
  71    // For pre sorting
  72    int OrderCompareA(Package *a, Package *b) APT_PURE;
  73    int OrderCompareB(Package *a, Package *b) APT_PURE;
  74    int FileCmp(PkgIterator A,PkgIterator B) APT_PURE;
  75
  76    public:
  77
  78    typedef Package **iterator;
  79
  80    /* State flags
  81       The Loop flag can be set on a package that is currently being processed by either SmartConfigure or
  82       SmartUnPack. This allows the package manager to tell when a loop has been formed as it will try to
  83       SmartUnPack or SmartConfigure a package with the Loop flag set. It will then either stop (as it knows
  84       that the operation is unnecessary as its already in process), or in the case of the conflicts resolution
  85       in SmartUnPack, use EarlyRemove to resolve the situation.  */
  86    enum Flags {Added = (1 << 0), AddPending = (1 << 1),
  87                Immediate = (1 << 2), Loop = (1 << 3),
  88                UnPacked = (1 << 4), Configured = (1 << 5),
  89                Removed = (1 << 6),        // Early Remove
  90                InList = (1 << 7),
  91                After = (1 << 8),
  92                States = (UnPacked | Configured | Removed)};
  93
  94    // Flag manipulators
  95    inline bool IsFlag(PkgIterator Pkg,unsigned long F) {return (Flags[Pkg->ID] & F) == F;};
  96    inline bool IsFlag(Package *Pkg,unsigned long F) {return (Flags[Pkg->ID] & F) == F;};
  97    void Flag(PkgIterator Pkg,unsigned long State, unsigned long F) {Flags[Pkg->ID] = (Flags[Pkg->ID] & (~F)) | State;};
  98    inline void Flag(PkgIterator Pkg,unsigned long F) {Flags[Pkg->ID] |= F;};
  99    inline void Flag(Package *Pkg,unsigned long F) {Flags[Pkg->ID] |= F;};
 100    // RmFlag removes a flag from a package
 101    inline void RmFlag(Package *Pkg,unsigned long F) {Flags[Pkg->ID] &= ~F;};
 102    // IsNow will return true if the Pkg has been not been either configured or unpacked
 103    inline bool IsNow(PkgIterator Pkg) {return (Flags[Pkg->ID] & (States & (~Removed))) == 0;};
 104    bool IsMissing(PkgIterator Pkg) APT_PURE;
 105    void WipeFlags(unsigned long F);
 106    void SetFileList(std::string *FileList) {this->FileList = FileList;};
 107
 108    // Accessors
 109    inline iterator begin() {return List;};
 110    inline iterator end() {return End;};
 111    inline void push_back(Package *Pkg) {*(End++) = Pkg;};
 112    inline void push_back(PkgIterator Pkg) {*(End++) = Pkg;};
 113    inline void pop_back() {End--;};
 114    inline bool empty() {return End == List;};
 115    inline unsigned int size() {return End - List;};
 116
 117    // Ordering modes
 118    bool OrderCritical();
 119    bool OrderUnpack(std::string *FileList = 0);
 120    bool OrderConfigure();
 121
 122    int Score(PkgIterator Pkg);
 123
 124    explicit pkgOrderList(pkgDepCache *Cache);
 125    virtual ~pkgOrderList();
 126 };
 127
 128 #endif