apt-pkg/cacheiterators.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Cache Iterators - Iterators for navigating the cache structure
   6
   7    The iterators all provides ++,==,!=,->,* and end for their type.
   8    The end function can be used to tell if the list has been fully
   9    traversed.
  10
  11    Unlike STL iterators these contain helper functions to access the data
  12    that is being iterated over. This is because the data structures can't
  13    be formed in a manner that is intuitive to use and also mmapable.
  14
  15    For each variable in the target structure that would need a translation
  16    to be accessed correctly a translating function of the same name is
  17    present in the iterator. If applicable the translating function will
  18    return an iterator.
  19
  20    The DepIterator can iterate over two lists, a list of 'version depends'
  21    or a list of 'package reverse depends'. The type is determined by the
  22    structure passed to the constructor, which should be the structure
  23    that has the depends pointer as a member. The provide iterator has the
  24    same system.
  25
  26    This header is not user includable, please use apt-pkg/pkgcache.h
  27
  28    ##################################################################### */
  29                                                                         /*}}}*/
  30 #ifndef PKGLIB_CACHEITERATORS_H
  31 #define PKGLIB_CACHEITERATORS_H
  32 #include<iterator>
  33
  34 #include<string.h>
  35 // abstract Iterator template                                           /*{{{*/
  36 /* This template provides the very basic iterator methods we
  37    need to have for doing some walk-over-the-cache magic */
  38 template<typename Str, typename Itr> class pkgCache::Iterator :
  39                         public std::iterator<std::forward_iterator_tag, Str> {
  40         protected:
  41         Str *S;
  42         pkgCache *Owner;
  43
  44         /** \brief Returns the Pointer for this struct in the owner
  45          *  The implementation of this method should be pretty short
  46          *  as it will only return the Pointer into the mmap stored
  47          *  in the owner but the name of this pointer is different for
  48          *  each stucture and we want to abstract here at least for the
  49          *  basic methods from the actual structure.
  50          *  \return Pointer to the first structure of this type
  51          */
  52         virtual Str* OwnerPointer() const = 0;
  53
  54         public:
  55         // Iteration
  56         virtual void operator ++(int) = 0;
  57         virtual void operator ++() = 0; // Should be {operator ++(0);};
  58         inline bool end() const {return Owner == 0 || S == OwnerPointer();};
  59
  60         // Comparison
  61         inline bool operator ==(const Itr &B) const {return S == B.S;};
  62         inline bool operator !=(const Itr &B) const {return S != B.S;};
  63
  64         // Accessors
  65         inline Str *operator ->() {return S;};
  66         inline Str const *operator ->() const {return S;};
  67         inline operator Str *() {return S == OwnerPointer() ? 0 : S;};
  68         inline operator Str const *() const {return S == OwnerPointer() ? 0 : S;};
  69         inline Str &operator *() {return *S;};
  70         inline Str const &operator *() const {return *S;};
  71         inline pkgCache *Cache() const {return Owner;};
  72
  73         // Mixed stuff
  74         inline void operator =(const Itr &B) {S = B.S; Owner = B.Owner;};
  75         inline bool IsGood() const { return S && Owner && ! end();};
  76         inline unsigned long Index() const {return S - OwnerPointer();};
  77
  78         void ReMap(void const * const oldMap, void const * const newMap) {
  79                 if (Owner == 0 || S == 0)
  80                         return;
  81                 S += (Str*)(newMap) - (Str*)(oldMap);
  82         }
  83
  84         // Constructors - look out for the variable assigning
  85         inline Iterator() : S(0), Owner(0) {};
  86         inline Iterator(pkgCache &Owner,Str *T = 0) : S(T), Owner(&Owner) {};
  87 };
  88                                                                         /*}}}*/
  89 // Group Iterator                                                       /*{{{*/
  90 /* Packages with the same name are collected in a Group so someone only
  91    interest in package names can iterate easily over the names, so the
  92    different architectures can be treated as of the "same" package
  93    (apt internally treat them as totally different packages) */
  94 class pkgCache::GrpIterator: public Iterator<Group, GrpIterator> {
  95         long HashIndex;
  96
  97         protected:
  98         inline Group* OwnerPointer() const {
  99                 return (Owner != 0) ? Owner->GrpP : 0;
 100         };
 101
 102         public:
 103         // This constructor is the 'begin' constructor, never use it.
 104         inline GrpIterator(pkgCache &Owner) : Iterator<Group, GrpIterator>(Owner), HashIndex(-1) {
 105                 S = OwnerPointer();
 106                 operator ++(0);
 107         };
 108
 109         virtual void operator ++(int);
 110         virtual void operator ++() {operator ++(0);};
 111
 112         inline const char *Name() const {return S->Name == 0?0:Owner->StrP + S->Name;};
 113         inline PkgIterator PackageList() const;
 114         PkgIterator FindPkg(string Arch = "any") const;
 115         /** \brief find the package with the "best" architecture
 116
 117             The best architecture is either the "native" or the first
 118             in the list of Architectures which is not an end-Pointer
 119
 120             \param PreferNonVirtual tries to respond with a non-virtual package
 121                    and only if this fails returns the best virtual package */
 122         PkgIterator FindPreferredPkg(bool const &PreferNonVirtual = true) const;
 123         PkgIterator NextPkg(PkgIterator const &Pkg) const;
 124
 125         // Constructors
 126         inline GrpIterator(pkgCache &Owner, Group *Trg) : Iterator<Group, GrpIterator>(Owner, Trg), HashIndex(0) {
 127                 if (S == 0)
 128                         S = OwnerPointer();
 129         };
 130         inline GrpIterator() : Iterator<Group, GrpIterator>(), HashIndex(0) {};
 131
 132 };
 133                                                                         /*}}}*/
 134 // Package Iterator                                                     /*{{{*/
 135 class pkgCache::PkgIterator: public Iterator<Package, PkgIterator> {
 136         long HashIndex;
 137
 138         protected:
 139         inline Package* OwnerPointer() const {
 140                 return (Owner != 0) ? Owner->PkgP : 0;
 141         };
 142
 143         public:
 144         // This constructor is the 'begin' constructor, never use it.
 145         inline PkgIterator(pkgCache &Owner) : Iterator<Package, PkgIterator>(Owner), HashIndex(-1) {
 146                 S = OwnerPointer();
 147                 operator ++(0);
 148         };
 149
 150         virtual void operator ++(int);
 151         virtual void operator ++() {operator ++(0);};
 152
 153         enum OkState {NeedsNothing,NeedsUnpack,NeedsConfigure};
 154
 155         // Accessors
 156         inline const char *Name() const {return S->Name == 0?0:Owner->StrP + S->Name;};
 157         inline const char *Section() const {return S->Section == 0?0:Owner->StrP + S->Section;};
 158         inline bool Purge() const {return S->CurrentState == pkgCache::State::Purge ||
 159                 (S->CurrentVer == 0 && S->CurrentState == pkgCache::State::NotInstalled);};
 160         inline const char *Arch() const {return S->Arch == 0?0:Owner->StrP + S->Arch;};
 161         inline GrpIterator Group() const { return GrpIterator(*Owner, Owner->GrpP + S->Group);};
 162
 163         inline VerIterator VersionList() const;
 164         inline VerIterator CurrentVer() const;
 165         inline DepIterator RevDependsList() const;
 166         inline PrvIterator ProvidesList() const;
 167         OkState State() const;
 168         const char *CandVersion() const;
 169         const char *CurVersion() const;
 170
 171         //Nice printable representation
 172         friend std::ostream& operator <<(std::ostream& out, PkgIterator i);
 173         std::string FullName(bool const &Pretty = false) const;
 174
 175         // Constructors
 176         inline PkgIterator(pkgCache &Owner,Package *Trg) : Iterator<Package, PkgIterator>(Owner, Trg), HashIndex(0) {
 177                 if (S == 0)
 178                         S = OwnerPointer();
 179         };
 180         inline PkgIterator() : Iterator<Package, PkgIterator>(), HashIndex(0) {};
 181 };
 182                                                                         /*}}}*/
 183 // Version Iterator                                                     /*{{{*/
 184 class pkgCache::VerIterator : public Iterator<Version, VerIterator> {
 185         protected:
 186         inline Version* OwnerPointer() const {
 187                 return (Owner != 0) ? Owner->VerP : 0;
 188         };
 189
 190         public:
 191         // Iteration
 192         void operator ++(int) {if (S != Owner->VerP) S = Owner->VerP + S->NextVer;};
 193         inline void operator ++() {operator ++(0);};
 194
 195         // Comparison
 196         int CompareVer(const VerIterator &B) const;
 197         /** \brief compares two version and returns if they are similar
 198
 199             This method should be used to identify if two pseudo versions are
 200             refering to the same "real" version */
 201         inline bool SimilarVer(const VerIterator &B) const {
 202                 return (B.end() == false && S->Hash == B->Hash && strcmp(VerStr(), B.VerStr()) == 0);
 203         };
 204
 205         // Accessors
 206         inline const char *VerStr() const {return S->VerStr == 0?0:Owner->StrP + S->VerStr;};
 207         inline const char *Section() const {return S->Section == 0?0:Owner->StrP + S->Section;};
 208         inline const char *Arch() const {
 209                 if(S->MultiArch == pkgCache::Version::All)
 210                         return "all";
 211                 return S->ParentPkg == 0?0:Owner->StrP + ParentPkg()->Arch;
 212         };
 213         inline const char *Arch(bool const pseudo) const {
 214                 if(pseudo == false)
 215                         return Arch();
 216                 return S->ParentPkg == 0?0:Owner->StrP + ParentPkg()->Arch;
 217         };
 218         inline PkgIterator ParentPkg() const {return PkgIterator(*Owner,Owner->PkgP + S->ParentPkg);};
 219
 220         inline DescIterator DescriptionList() const;
 221         DescIterator TranslatedDescription() const;
 222         inline DepIterator DependsList() const;
 223         inline PrvIterator ProvidesList() const;
 224         inline VerFileIterator FileList() const;
 225         bool Downloadable() const;
 226         inline const char *PriorityType() const {return Owner->Priority(S->Priority);};
 227         string RelStr() const;
 228
 229         bool Automatic() const;
 230         bool Pseudo() const;
 231         VerFileIterator NewestFile() const;
 232
 233         inline VerIterator(pkgCache &Owner,Version *Trg = 0) : Iterator<Version, VerIterator>(Owner, Trg) {
 234                 if (S == 0)
 235                         S = OwnerPointer();
 236         };
 237         inline VerIterator() : Iterator<Version, VerIterator>() {};
 238 };
 239                                                                         /*}}}*/
 240 // Description Iterator                                                 /*{{{*/
 241 class pkgCache::DescIterator : public Iterator<Description, DescIterator> {
 242         protected:
 243         inline Description* OwnerPointer() const {
 244                 return (Owner != 0) ? Owner->DescP : 0;
 245         };
 246
 247         public:
 248         // Iteration
 249         void operator ++(int) {if (S != Owner->DescP) S = Owner->DescP + S->NextDesc;};
 250         inline void operator ++() {operator ++(0);};
 251
 252         // Comparison
 253         int CompareDesc(const DescIterator &B) const;
 254
 255         // Accessors
 256         inline const char *LanguageCode() const {return Owner->StrP + S->language_code;};
 257         inline const char *md5() const {return Owner->StrP + S->md5sum;};
 258         inline DescFileIterator FileList() const;
 259
 260         inline DescIterator() : Iterator<Description, DescIterator>() {};
 261         inline DescIterator(pkgCache &Owner,Description *Trg = 0) : Iterator<Description, DescIterator>(Owner, Trg) {
 262                 if (S == 0)
 263                         S = Owner.DescP;
 264         };
 265 };
 266                                                                         /*}}}*/
 267 // Dependency iterator                                                  /*{{{*/
 268 class pkgCache::DepIterator : public Iterator<Dependency, DepIterator> {
 269         enum {DepVer, DepRev} Type;
 270
 271         protected:
 272         inline Dependency* OwnerPointer() const {
 273                 return (Owner != 0) ? Owner->DepP : 0;
 274         };
 275
 276         public:
 277         // Iteration
 278         void operator ++(int) {if (S != Owner->DepP) S = Owner->DepP +
 279                 (Type == DepVer ? S->NextDepends : S->NextRevDepends);};
 280         inline void operator ++() {operator ++(0);};
 281
 282         // Accessors
 283         inline const char *TargetVer() const {return S->Version == 0?0:Owner->StrP + S->Version;};
 284         inline PkgIterator TargetPkg() const {return PkgIterator(*Owner,Owner->PkgP + S->Package);};
 285         inline PkgIterator SmartTargetPkg() const {PkgIterator R(*Owner,0);SmartTargetPkg(R);return R;};
 286         inline VerIterator ParentVer() const {return VerIterator(*Owner,Owner->VerP + S->ParentVer);};
 287         inline PkgIterator ParentPkg() const {return PkgIterator(*Owner,Owner->PkgP + Owner->VerP[S->ParentVer].ParentPkg);};
 288         inline bool Reverse() const {return Type == DepRev;};
 289         bool IsCritical() const;
 290         void GlobOr(DepIterator &Start,DepIterator &End);
 291         Version **AllTargets() const;
 292         bool SmartTargetPkg(PkgIterator &Result) const;
 293         inline const char *CompType() const {return Owner->CompType(S->CompareOp);};
 294         inline const char *DepType() const {return Owner->DepType(S->Type);};
 295
 296         //Nice printable representation
 297         friend std::ostream& operator <<(std::ostream& out, DepIterator D);
 298
 299         inline DepIterator(pkgCache &Owner, Dependency *Trg, Version* = 0) :
 300                 Iterator<Dependency, DepIterator>(Owner, Trg), Type(DepVer) {
 301                 if (S == 0)
 302                         S = Owner.DepP;
 303         };
 304         inline DepIterator(pkgCache &Owner, Dependency *Trg, Package*) :
 305                 Iterator<Dependency, DepIterator>(Owner, Trg), Type(DepRev) {
 306                 if (S == 0)
 307                         S = Owner.DepP;
 308         };
 309         inline DepIterator() : Iterator<Dependency, DepIterator>(), Type(DepVer) {};
 310 };
 311                                                                         /*}}}*/
 312 // Provides iterator                                                    /*{{{*/
 313 class pkgCache::PrvIterator : public Iterator<Provides, PrvIterator> {
 314         enum {PrvVer, PrvPkg} Type;
 315
 316         protected:
 317         inline Provides* OwnerPointer() const {
 318                 return (Owner != 0) ? Owner->ProvideP : 0;
 319         };
 320
 321         public:
 322         // Iteration
 323         void operator ++(int) {if (S != Owner->ProvideP) S = Owner->ProvideP +
 324                 (Type == PrvVer?S->NextPkgProv:S->NextProvides);};
 325         inline void operator ++() {operator ++(0);};
 326
 327         // Accessors
 328         inline const char *Name() const {return Owner->StrP + Owner->PkgP[S->ParentPkg].Name;};
 329         inline const char *ProvideVersion() const {return S->ProvideVersion == 0?0:Owner->StrP + S->ProvideVersion;};
 330         inline PkgIterator ParentPkg() const {return PkgIterator(*Owner,Owner->PkgP + S->ParentPkg);};
 331         inline VerIterator OwnerVer() const {return VerIterator(*Owner,Owner->VerP + S->Version);};
 332         inline PkgIterator OwnerPkg() const {return PkgIterator(*Owner,Owner->PkgP + Owner->VerP[S->Version].ParentPkg);};
 333
 334         inline PrvIterator() : Iterator<Provides, PrvIterator>(), Type(PrvVer) {};
 335
 336         inline PrvIterator(pkgCache &Owner, Provides *Trg, Version*) :
 337                 Iterator<Provides, PrvIterator>(Owner, Trg), Type(PrvVer) {
 338                 if (S == 0)
 339                         S = Owner.ProvideP;
 340         };
 341         inline PrvIterator(pkgCache &Owner, Provides *Trg, Package*) :
 342                 Iterator<Provides, PrvIterator>(Owner, Trg), Type(PrvPkg) {
 343                 if (S == 0)
 344                         S = Owner.ProvideP;
 345         };
 346 };
 347                                                                         /*}}}*/
 348 // Package file                                                         /*{{{*/
 349 class pkgCache::PkgFileIterator : public Iterator<PackageFile, PkgFileIterator> {
 350         protected:
 351         inline PackageFile* OwnerPointer() const {
 352                 return (Owner != 0) ? Owner->PkgFileP : 0;
 353         };
 354
 355         public:
 356         // Iteration
 357         void operator ++(int) {if (S != Owner->PkgFileP) S = Owner->PkgFileP + S->NextFile;};
 358         inline void operator ++() {operator ++(0);};
 359
 360         // Accessors
 361         inline const char *FileName() const {return S->FileName == 0?0:Owner->StrP + S->FileName;};
 362         inline const char *Archive() const {return S->Archive == 0?0:Owner->StrP + S->Archive;};
 363         inline const char *Component() const {return S->Component == 0?0:Owner->StrP + S->Component;};
 364         inline const char *Version() const {return S->Version == 0?0:Owner->StrP + S->Version;};
 365         inline const char *Origin() const {return S->Origin == 0?0:Owner->StrP + S->Origin;};
 366         inline const char *Codename() const {return S->Codename ==0?0:Owner->StrP + S->Codename;};
 367         inline const char *Label() const {return S->Label == 0?0:Owner->StrP + S->Label;};
 368         inline const char *Site() const {return S->Site == 0?0:Owner->StrP + S->Site;};
 369         inline const char *Architecture() const {return S->Architecture == 0?0:Owner->StrP + S->Architecture;};
 370         inline const char *IndexType() const {return S->IndexType == 0?0:Owner->StrP + S->IndexType;};
 371
 372         bool IsOk();
 373         string RelStr();
 374
 375         // Constructors
 376         inline PkgFileIterator() : Iterator<PackageFile, PkgFileIterator>() {};
 377         inline PkgFileIterator(pkgCache &Owner) : Iterator<PackageFile, PkgFileIterator>(Owner, Owner.PkgFileP) {};
 378         inline PkgFileIterator(pkgCache &Owner,PackageFile *Trg) : Iterator<PackageFile, PkgFileIterator>(Owner, Trg) {};
 379 };
 380                                                                         /*}}}*/
 381 // Version File                                                         /*{{{*/
 382 class pkgCache::VerFileIterator : public pkgCache::Iterator<VerFile, VerFileIterator> {
 383         protected:
 384         inline VerFile* OwnerPointer() const {
 385                 return (Owner != 0) ? Owner->VerFileP : 0;
 386         };
 387
 388         public:
 389         // Iteration
 390         void operator ++(int) {if (S != Owner->VerFileP) S = Owner->VerFileP + S->NextFile;};
 391         inline void operator ++() {operator ++(0);};
 392
 393         // Accessors
 394         inline PkgFileIterator File() const {return PkgFileIterator(*Owner,S->File + Owner->PkgFileP);};
 395
 396         inline VerFileIterator() : Iterator<VerFile, VerFileIterator>() {};
 397         inline VerFileIterator(pkgCache &Owner,VerFile *Trg) : Iterator<VerFile, VerFileIterator>(Owner, Trg) {};
 398 };
 399                                                                         /*}}}*/
 400 // Description File                                                     /*{{{*/
 401 class pkgCache::DescFileIterator : public Iterator<DescFile, DescFileIterator> {
 402         protected:
 403         inline DescFile* OwnerPointer() const {
 404                 return (Owner != 0) ? Owner->DescFileP : 0;
 405         };
 406
 407         public:
 408         // Iteration
 409         void operator ++(int) {if (S != Owner->DescFileP) S = Owner->DescFileP + S->NextFile;};
 410         inline void operator ++() {operator ++(0);};
 411
 412         // Accessors
 413         inline PkgFileIterator File() const {return PkgFileIterator(*Owner,S->File + Owner->PkgFileP);};
 414
 415         inline DescFileIterator() : Iterator<DescFile, DescFileIterator>() {};
 416         inline DescFileIterator(pkgCache &Owner,DescFile *Trg) : Iterator<DescFile, DescFileIterator>(Owner, Trg) {};
 417 };
 418                                                                         /*}}}*/
 419 // Inlined Begin functions cant be in the class because of order problems /*{{{*/
 420 inline pkgCache::PkgIterator pkgCache::GrpIterator::PackageList() const
 421        {return PkgIterator(*Owner,Owner->PkgP + S->FirstPackage);};
 422 inline pkgCache::VerIterator pkgCache::PkgIterator::VersionList() const
 423        {return VerIterator(*Owner,Owner->VerP + S->VersionList);};
 424 inline pkgCache::VerIterator pkgCache::PkgIterator::CurrentVer() const
 425        {return VerIterator(*Owner,Owner->VerP + S->CurrentVer);};
 426 inline pkgCache::DepIterator pkgCache::PkgIterator::RevDependsList() const
 427        {return DepIterator(*Owner,Owner->DepP + S->RevDepends,S);};
 428 inline pkgCache::PrvIterator pkgCache::PkgIterator::ProvidesList() const
 429        {return PrvIterator(*Owner,Owner->ProvideP + S->ProvidesList,S);};
 430 inline pkgCache::DescIterator pkgCache::VerIterator::DescriptionList() const
 431        {return DescIterator(*Owner,Owner->DescP + S->DescriptionList);};
 432 inline pkgCache::PrvIterator pkgCache::VerIterator::ProvidesList() const
 433        {return PrvIterator(*Owner,Owner->ProvideP + S->ProvidesList,S);};
 434 inline pkgCache::DepIterator pkgCache::VerIterator::DependsList() const
 435        {return DepIterator(*Owner,Owner->DepP + S->DependsList,S);};
 436 inline pkgCache::VerFileIterator pkgCache::VerIterator::FileList() const
 437        {return VerFileIterator(*Owner,Owner->VerFileP + S->FileList);};
 438 inline pkgCache::DescFileIterator pkgCache::DescIterator::FileList() const
 439        {return DescFileIterator(*Owner,Owner->DescFileP + S->FileList);};
 440                                                                         /*}}}*/
 441 #endif