+#include<iterator>
+
+#include<string.h>
+
+// abstract Iterator template /*{{{*/
+/* This template provides the very basic iterator methods we
+ need to have for doing some walk-over-the-cache magic */
+template<typename Str, typename Itr> class pkgCache::Iterator :
+ public std::iterator<std::forward_iterator_tag, Str> {
+ protected:
+ Str *S;
+ pkgCache *Owner;
+
+ /** \brief Returns the Pointer for this struct in the owner
+ * The implementation of this method should be pretty short
+ * as it will only return the Pointer into the mmap stored
+ * in the owner but the name of this pointer is different for
+ * each stucture and we want to abstract here at least for the
+ * basic methods from the actual structure.
+ * \return Pointer to the first structure of this type
+ */
+ virtual Str* OwnerPointer() const = 0;
+
+ public:
+ // Iteration
+ virtual void operator ++(int) = 0;
+ virtual void operator ++() = 0; // Should be {operator ++(0);};
+ inline bool end() const {return Owner == 0 || S == OwnerPointer();};
+
+ // Comparison
+ inline bool operator ==(const Itr &B) const {return S == B.S;};
+ inline bool operator !=(const Itr &B) const {return S != B.S;};
+
+ // Accessors
+ inline Str *operator ->() {return S;};
+ inline Str const *operator ->() const {return S;};
+ inline operator Str *() {return S == OwnerPointer() ? 0 : S;};
+ inline operator Str const *() const {return S == OwnerPointer() ? 0 : S;};
+ inline Str &operator *() {return *S;};
+ inline Str const &operator *() const {return *S;};
+ inline pkgCache *Cache() const {return Owner;};
+
+ // Mixed stuff
+ inline void operator =(const Itr &B) {S = B.S; Owner = B.Owner;};
+ inline bool IsGood() const { return S && Owner && ! end();};
+ inline unsigned long Index() const {return S - OwnerPointer();};
+
+ void ReMap(void const * const oldMap, void const * const newMap) {
+ if (Owner == 0 || S == 0)
+ return;
+ S += (Str*)(newMap) - (Str*)(oldMap);
+ }
+
+ // Constructors - look out for the variable assigning
+ inline Iterator() : S(0), Owner(0) {};
+ inline Iterator(pkgCache &Owner,Str *T = 0) : S(T), Owner(&Owner) {};
+};
+ /*}}}*/
+// Group Iterator /*{{{*/
+/* Packages with the same name are collected in a Group so someone only
+ interest in package names can iterate easily over the names, so the
+ different architectures can be treated as of the "same" package
+ (apt internally treat them as totally different packages) */
+class pkgCache::GrpIterator: public Iterator<Group, GrpIterator> {
+ long HashIndex;
+
+ protected:
+ inline Group* OwnerPointer() const {
+ return (Owner != 0) ? Owner->GrpP : 0;
+ };
+
+ public:
+ // This constructor is the 'begin' constructor, never use it.
+ inline GrpIterator(pkgCache &Owner) : Iterator<Group, GrpIterator>(Owner), HashIndex(-1) {
+ S = OwnerPointer();
+ operator ++(0);
+ };
+
+ virtual void operator ++(int);
+ virtual void operator ++() {operator ++(0);};
+
+ inline const char *Name() const {return S->Name == 0?0:Owner->StrP + S->Name;};
+ inline PkgIterator PackageList() const;
+ PkgIterator FindPkg(std::string Arch = "any") const;
+ /** \brief find the package with the "best" architecture
+
+ The best architecture is either the "native" or the first
+ in the list of Architectures which is not an end-Pointer
+
+ \param PreferNonVirtual tries to respond with a non-virtual package
+ and only if this fails returns the best virtual package */
+ PkgIterator FindPreferredPkg(bool const &PreferNonVirtual = true) const;
+ PkgIterator NextPkg(PkgIterator const &Pkg) const;
+
+ // Constructors
+ inline GrpIterator(pkgCache &Owner, Group *Trg) : Iterator<Group, GrpIterator>(Owner, Trg), HashIndex(0) {
+ if (S == 0)
+ S = OwnerPointer();
+ };
+ inline GrpIterator() : Iterator<Group, GrpIterator>(), HashIndex(0) {};
projects / apt.git / blobdiff