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1// -*- mode: cpp; mode: fold -*-
2// Description /*{{{*/
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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
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23 that has the depends pointer as a member. The provide iterator has the
24 same system.
578bfd0a 25
094a497d 26 This header is not user includable, please use apt-pkg/pkgcache.h
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27
28 ##################################################################### */
29 /*}}}*/
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30#ifndef PKGLIB_CACHEITERATORS_H
31#define PKGLIB_CACHEITERATORS_H
b3fdb998 32#include<iterator>
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33// abstract Iterator template /*{{{*/
34/* This template provides the very basic iterator methods we
5bf15716 35 need to have for doing some walk-over-the-cache magic */
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36template<typename Str, typename Itr> class pkgCache::Iterator :
37 public std::iterator<std::forward_iterator_tag, Str> {
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38 protected:
39 Str *S;
40 pkgCache *Owner;
41
42 /** \brief Returns the Pointer for this struct in the owner
43 * The implementation of this method should be pretty short
44 * as it will only return the Pointer into the mmap stored
45 * in the owner but the name of this pointer is different for
46 * each stucture and we want to abstract here at least for the
47 * basic methods from the actual structure.
48 * \return Pointer to the first structure of this type
49 */
50 virtual Str* OwnerPointer() const = 0;
51
52 public:
53 // Iteration
54 virtual void operator ++(int) = 0;
55 virtual void operator ++() = 0; // Should be {operator ++(0);};
56 inline bool end() const {return Owner == 0 || S == OwnerPointer();};
57
58 // Comparison
59 inline bool operator ==(const Itr &B) const {return S == B.S;};
60 inline bool operator !=(const Itr &B) const {return S != B.S;};
61
62 // Accessors
63 inline Str *operator ->() {return S;};
64 inline Str const *operator ->() const {return S;};
65 inline operator Str *() {return S == OwnerPointer() ? 0 : S;};
66 inline operator Str const *() const {return S == OwnerPointer() ? 0 : S;};
9552aeeb 67 inline Str &operator *() {return *S;};
773e2c1f 68 inline Str const &operator *() const {return *S;};
ffee1c2b 69 inline pkgCache *Cache() const {return Owner;};
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70
71 // Mixed stuff
72 inline void operator =(const Itr &B) {S = B.S; Owner = B.Owner;};
73 inline bool IsGood() const { return S && Owner && ! end();};
74 inline unsigned long Index() const {return S - OwnerPointer();};
75
76 // Constructors - look out for the variable assigning
77 inline Iterator() : S(0), Owner(0) {};
78 inline Iterator(pkgCache &Owner,Str *T = 0) : S(T), Owner(&Owner) {};
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79};
80 /*}}}*/
81// Group Iterator /*{{{*/
82/* Packages with the same name are collected in a Group so someone only
83 interest in package names can iterate easily over the names, so the
84 different architectures can be treated as of the "same" package
85 (apt internally treat them as totally different packages) */
86class pkgCache::GrpIterator: public Iterator<Group, GrpIterator> {
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87 long HashIndex;
88
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89 protected:
90 inline Group* OwnerPointer() const {
91 return Owner->GrpP;
92 };
93
94 public:
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95 // This constructor is the 'begin' constructor, never use it.
96 inline GrpIterator(pkgCache &Owner) : Iterator<Group, GrpIterator>(Owner), HashIndex(-1) {
97 S = OwnerPointer();
98 operator ++(0);
99 };
100
101 virtual void operator ++(int);
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102 virtual void operator ++() {operator ++(0);};
103
104 inline const char *Name() const {return S->Name == 0?0:Owner->StrP + S->Name;};
105 inline PkgIterator PackageList() const;
106 PkgIterator FindPkg(string Arch = "any");
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107 /** \brief find the package with the "best" architecture
108
109 The best architecture is either the "native" or the first
110 in the list of Architectures which is not an end-Pointer */
111 PkgIterator FindPreferredPkg();
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112 PkgIterator NextPkg(PkgIterator const &Pkg);
113
114 // Constructors
25396fb0 115 inline GrpIterator(pkgCache &Owner, Group *Trg) : Iterator<Group, GrpIterator>(Owner, Trg), HashIndex(0) {
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116 if (S == 0)
117 S = OwnerPointer();
118 };
25396fb0 119 inline GrpIterator() : Iterator<Group, GrpIterator>(), HashIndex(0) {};
5bf15716 120
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121};
122 /*}}}*/
92fcbfc1 123// Package Iterator /*{{{*/
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124class pkgCache::PkgIterator: public Iterator<Package, PkgIterator> {
125 long HashIndex;
126
127 protected:
128 inline Package* OwnerPointer() const {
129 return Owner->PkgP;
130 };
131
132 public:
133 // This constructor is the 'begin' constructor, never use it.
134 inline PkgIterator(pkgCache &Owner) : Iterator<Package, PkgIterator>(Owner), HashIndex(-1) {
135 S = OwnerPointer();
136 operator ++(0);
137 };
138
139 virtual void operator ++(int);
140 virtual void operator ++() {operator ++(0);};
141
142 enum OkState {NeedsNothing,NeedsUnpack,NeedsConfigure};
143
144 // Accessors
145 inline const char *Name() const {return S->Name == 0?0:Owner->StrP + S->Name;};
146 inline const char *Section() const {return S->Section == 0?0:Owner->StrP + S->Section;};
147 inline bool Purge() const {return S->CurrentState == pkgCache::State::Purge ||
148 (S->CurrentVer == 0 && S->CurrentState == pkgCache::State::NotInstalled);};
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149 inline const char *Arch() const {return S->Arch == 0?0:Owner->StrP + S->Arch;};
150 inline GrpIterator Group() const { return GrpIterator(*Owner, Owner->GrpP + S->Group);};
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151
152 inline VerIterator VersionList() const;
153 inline VerIterator CurrentVer() const;
154 inline DepIterator RevDependsList() const;
155 inline PrvIterator ProvidesList() const;
156 OkState State() const;
157 const char *CandVersion() const;
158 const char *CurVersion() const;
159
160 //Nice printable representation
161 friend std::ostream& operator <<(std::ostream& out, PkgIterator i);
75ce2062 162 std::string FullName(bool const &Pretty = false) const;
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163
164 // Constructors
165 inline PkgIterator(pkgCache &Owner,Package *Trg) : Iterator<Package, PkgIterator>(Owner, Trg), HashIndex(0) {
166 if (S == 0)
167 S = OwnerPointer();
168 };
169 inline PkgIterator() : Iterator<Package, PkgIterator>(), HashIndex(0) {};
578bfd0a 170};
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171 /*}}}*/
172// Version Iterator /*{{{*/
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173class pkgCache::VerIterator : public Iterator<Version, VerIterator> {
174 protected:
175 inline Version* OwnerPointer() const {
176 return Owner->VerP;
177 };
178
179 public:
180 // Iteration
181 void operator ++(int) {if (S != Owner->VerP) S = Owner->VerP + S->NextVer;};
182 inline void operator ++() {operator ++(0);};
183
184 // Comparison
185 int CompareVer(const VerIterator &B) const;
186
187 // Accessors
188 inline const char *VerStr() const {return S->VerStr == 0?0:Owner->StrP + S->VerStr;};
189 inline const char *Section() const {return S->Section == 0?0:Owner->StrP + S->Section;};
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190 inline const char *Arch() const {
191 if(S->MultiArch == pkgCache::Version::All)
192 return "all";
193 return S->ParentPkg == 0?0:Owner->StrP + ParentPkg()->Arch;
194 };
195 inline const char *Arch(bool const pseudo) const {
196 if(pseudo == false)
197 return Arch();
198 return S->ParentPkg == 0?0:Owner->StrP + ParentPkg()->Arch;
199 };
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200 inline PkgIterator ParentPkg() const {return PkgIterator(*Owner,Owner->PkgP + S->ParentPkg);};
201
202 inline DescIterator DescriptionList() const;
203 DescIterator TranslatedDescription() const;
204 inline DepIterator DependsList() const;
205 inline PrvIterator ProvidesList() const;
206 inline VerFileIterator FileList() const;
207 bool Downloadable() const;
208 inline const char *PriorityType() {return Owner->Priority(S->Priority);};
209 string RelStr();
210
211 bool Automatic() const;
803ea2a8 212 bool Pseudo() const;
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213 VerFileIterator NewestFile() const;
214
215 inline VerIterator(pkgCache &Owner,Version *Trg = 0) : Iterator<Version, VerIterator>(Owner, Trg) {
216 if (S == 0)
217 S = OwnerPointer();
218 };
219 inline VerIterator() : Iterator<Version, VerIterator>() {};
578bfd0a 220};
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221 /*}}}*/
222// Description Iterator /*{{{*/
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223class pkgCache::DescIterator : public Iterator<Description, DescIterator> {
224 protected:
225 inline Description* OwnerPointer() const {
226 return Owner->DescP;
227 };
228
229 public:
230 // Iteration
231 void operator ++(int) {if (S != Owner->DescP) S = Owner->DescP + S->NextDesc;};
232 inline void operator ++() {operator ++(0);};
233
234 // Comparison
235 int CompareDesc(const DescIterator &B) const;
236
237 // Accessors
238 inline const char *LanguageCode() const {return Owner->StrP + S->language_code;};
239 inline const char *md5() const {return Owner->StrP + S->md5sum;};
240 inline DescFileIterator FileList() const;
241
242 inline DescIterator() : Iterator<Description, DescIterator>() {};
243 inline DescIterator(pkgCache &Owner,Description *Trg = 0) : Iterator<Description, DescIterator>(Owner, Trg) {
244 if (S == 0)
245 S = Owner.DescP;
246 };
a52f938b 247};
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248 /*}}}*/
249// Dependency iterator /*{{{*/
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250class pkgCache::DepIterator : public Iterator<Dependency, DepIterator> {
251 enum {DepVer, DepRev} Type;
252
253 protected:
254 inline Dependency* OwnerPointer() const {
255 return Owner->DepP;
256 };
257
258 public:
259 // Iteration
260 void operator ++(int) {if (S != Owner->DepP) S = Owner->DepP +
261 (Type == DepVer ? S->NextDepends : S->NextRevDepends);};
262 inline void operator ++() {operator ++(0);};
263
264 // Accessors
265 inline const char *TargetVer() const {return S->Version == 0?0:Owner->StrP + S->Version;};
266 inline PkgIterator TargetPkg() {return PkgIterator(*Owner,Owner->PkgP + S->Package);};
267 inline PkgIterator SmartTargetPkg() {PkgIterator R(*Owner,0);SmartTargetPkg(R);return R;};
268 inline VerIterator ParentVer() {return VerIterator(*Owner,Owner->VerP + S->ParentVer);};
269 inline PkgIterator ParentPkg() {return PkgIterator(*Owner,Owner->PkgP + Owner->VerP[S->ParentVer].ParentPkg);};
270 inline bool Reverse() {return Type == DepRev;};
271 bool IsCritical();
272 void GlobOr(DepIterator &Start,DepIterator &End);
273 Version **AllTargets();
274 bool SmartTargetPkg(PkgIterator &Result);
275 inline const char *CompType() {return Owner->CompType(S->CompareOp);};
276 inline const char *DepType() {return Owner->DepType(S->Type);};
277
278 inline DepIterator(pkgCache &Owner, Dependency *Trg, Version* = 0) :
279 Iterator<Dependency, DepIterator>(Owner, Trg), Type(DepVer) {
280 if (S == 0)
281 S = Owner.DepP;
282 };
283 inline DepIterator(pkgCache &Owner, Dependency *Trg, Package*) :
284 Iterator<Dependency, DepIterator>(Owner, Trg), Type(DepRev) {
285 if (S == 0)
286 S = Owner.DepP;
287 };
288 inline DepIterator() : Iterator<Dependency, DepIterator>(), Type(DepVer) {};
578bfd0a 289};
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290 /*}}}*/
291// Provides iterator /*{{{*/
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292class pkgCache::PrvIterator : public Iterator<Provides, PrvIterator> {
293 enum {PrvVer, PrvPkg} Type;
294
295 protected:
296 inline Provides* OwnerPointer() const {
297 return Owner->ProvideP;
298 };
299
300 public:
301 // Iteration
302 void operator ++(int) {if (S != Owner->ProvideP) S = Owner->ProvideP +
303 (Type == PrvVer?S->NextPkgProv:S->NextProvides);};
304 inline void operator ++() {operator ++(0);};
305
306 // Accessors
307 inline const char *Name() const {return Owner->StrP + Owner->PkgP[S->ParentPkg].Name;};
308 inline const char *ProvideVersion() const {return S->ProvideVersion == 0?0:Owner->StrP + S->ProvideVersion;};
309 inline PkgIterator ParentPkg() {return PkgIterator(*Owner,Owner->PkgP + S->ParentPkg);};
310 inline VerIterator OwnerVer() {return VerIterator(*Owner,Owner->VerP + S->Version);};
311 inline PkgIterator OwnerPkg() {return PkgIterator(*Owner,Owner->PkgP + Owner->VerP[S->Version].ParentPkg);};
312
313 inline PrvIterator() : Iterator<Provides, PrvIterator>(), Type(PrvVer) {};
314
315 inline PrvIterator(pkgCache &Owner, Provides *Trg, Version*) :
316 Iterator<Provides, PrvIterator>(Owner, Trg), Type(PrvVer) {
317 if (S == 0)
318 S = Owner.ProvideP;
319 };
320 inline PrvIterator(pkgCache &Owner, Provides *Trg, Package*) :
321 Iterator<Provides, PrvIterator>(Owner, Trg), Type(PrvPkg) {
322 if (S == 0)
323 S = Owner.ProvideP;
324 };
578bfd0a 325};
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326 /*}}}*/
327// Package file /*{{{*/
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328class pkgCache::PkgFileIterator : public Iterator<PackageFile, PkgFileIterator> {
329 protected:
330 inline PackageFile* OwnerPointer() const {
331 return Owner->PkgFileP;
332 };
333
334 public:
335 // Iteration
336 void operator ++(int) {if (S != Owner->PkgFileP) S = Owner->PkgFileP + S->NextFile;};
337 inline void operator ++() {operator ++(0);};
338
339 // Accessors
340 inline const char *FileName() const {return S->FileName == 0?0:Owner->StrP + S->FileName;};
341 inline const char *Archive() const {return S->Archive == 0?0:Owner->StrP + S->Archive;};
342 inline const char *Component() const {return S->Component == 0?0:Owner->StrP + S->Component;};
343 inline const char *Version() const {return S->Version == 0?0:Owner->StrP + S->Version;};
344 inline const char *Origin() const {return S->Origin == 0?0:Owner->StrP + S->Origin;};
345 inline const char *Codename() const {return S->Codename ==0?0:Owner->StrP + S->Codename;};
346 inline const char *Label() const {return S->Label == 0?0:Owner->StrP + S->Label;};
347 inline const char *Site() const {return S->Site == 0?0:Owner->StrP + S->Site;};
348 inline const char *Architecture() const {return S->Architecture == 0?0:Owner->StrP + S->Architecture;};
349 inline const char *IndexType() const {return S->IndexType == 0?0:Owner->StrP + S->IndexType;};
350
351 bool IsOk();
352 string RelStr();
353
354 // Constructors
355 inline PkgFileIterator() : Iterator<PackageFile, PkgFileIterator>() {};
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356 inline PkgFileIterator(pkgCache &Owner) : Iterator<PackageFile, PkgFileIterator>(Owner, Owner.PkgFileP) {};
357 inline PkgFileIterator(pkgCache &Owner,PackageFile *Trg) : Iterator<PackageFile, PkgFileIterator>(Owner, Trg) {};
578bfd0a 358};
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359 /*}}}*/
360// Version File /*{{{*/
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361class pkgCache::VerFileIterator : public pkgCache::Iterator<VerFile, VerFileIterator> {
362 protected:
363 inline VerFile* OwnerPointer() const {
364 return Owner->VerFileP;
365 };
366
367 public:
368 // Iteration
369 void operator ++(int) {if (S != Owner->VerFileP) S = Owner->VerFileP + S->NextFile;};
370 inline void operator ++() {operator ++(0);};
371
372 // Accessors
373 inline PkgFileIterator File() const {return PkgFileIterator(*Owner,S->File + Owner->PkgFileP);};
374
375 inline VerFileIterator() : Iterator<VerFile, VerFileIterator>() {};
376 inline VerFileIterator(pkgCache &Owner,VerFile *Trg) : Iterator<VerFile, VerFileIterator>(Owner, Trg) {};
dcb79bae 377};
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378 /*}}}*/
379// Description File /*{{{*/
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380class pkgCache::DescFileIterator : public Iterator<DescFile, DescFileIterator> {
381 protected:
382 inline DescFile* OwnerPointer() const {
383 return Owner->DescFileP;
384 };
385
386 public:
387 // Iteration
388 void operator ++(int) {if (S != Owner->DescFileP) S = Owner->DescFileP + S->NextFile;};
389 inline void operator ++() {operator ++(0);};
390
391 // Accessors
392 inline PkgFileIterator File() const {return PkgFileIterator(*Owner,S->File + Owner->PkgFileP);};
393
394 inline DescFileIterator() : Iterator<DescFile, DescFileIterator>() {};
395 inline DescFileIterator(pkgCache &Owner,DescFile *Trg) : Iterator<DescFile, DescFileIterator>(Owner, Trg) {};
a52f938b 396};
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397 /*}}}*/
398// Inlined Begin functions cant be in the class because of order problems /*{{{*/
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399inline pkgCache::PkgIterator pkgCache::GrpIterator::PackageList() const
400 {return PkgIterator(*Owner,Owner->PkgP + S->FirstPackage);};
578bfd0a 401inline pkgCache::VerIterator pkgCache::PkgIterator::VersionList() const
773e2c1f 402 {return VerIterator(*Owner,Owner->VerP + S->VersionList);};
578bfd0a 403inline pkgCache::VerIterator pkgCache::PkgIterator::CurrentVer() const
773e2c1f 404 {return VerIterator(*Owner,Owner->VerP + S->CurrentVer);};
578bfd0a 405inline pkgCache::DepIterator pkgCache::PkgIterator::RevDependsList() const
773e2c1f 406 {return DepIterator(*Owner,Owner->DepP + S->RevDepends,S);};
578bfd0a 407inline pkgCache::PrvIterator pkgCache::PkgIterator::ProvidesList() const
773e2c1f 408 {return PrvIterator(*Owner,Owner->ProvideP + S->ProvidesList,S);};
a52f938b 409inline pkgCache::DescIterator pkgCache::VerIterator::DescriptionList() const
773e2c1f 410 {return DescIterator(*Owner,Owner->DescP + S->DescriptionList);};
578bfd0a 411inline pkgCache::PrvIterator pkgCache::VerIterator::ProvidesList() const
773e2c1f 412 {return PrvIterator(*Owner,Owner->ProvideP + S->ProvidesList,S);};
578bfd0a 413inline pkgCache::DepIterator pkgCache::VerIterator::DependsList() const
773e2c1f 414 {return DepIterator(*Owner,Owner->DepP + S->DependsList,S);};
dcb79bae 415inline pkgCache::VerFileIterator pkgCache::VerIterator::FileList() const
773e2c1f 416 {return VerFileIterator(*Owner,Owner->VerFileP + S->FileList);};
a52f938b 417inline pkgCache::DescFileIterator pkgCache::DescIterator::FileList() const
773e2c1f 418 {return DescFileIterator(*Owner,Owner->DescFileP + S->FileList);};
92fcbfc1 419 /*}}}*/
578bfd0a 420#endif