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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Package Version Policy implementation
+
+ This implements the more advanced 'Version 4' APT policy engine. The
+ standard 'Version 0' engine is included inside the DepCache which is
+ it's historical location.
+
+ The V4 engine allows the user to completely control all aspects of
+ version selection. There are three primary means to choose a version
+ * Selection by version match
+ * Selection by Release file match
+ * Selection by origin server
+
+ Each package may be 'pinned' with a single criteria, which will ultimately
+ result in the selection of a single version, or no version, for each
+ package.
+
+ Furthermore, the default selection can be influenced by specifying
+ the ordering of package files. The order is derived by reading the
+ package file preferences and assigning a priority to each package
+ file.
+
+ A special flag may be set to indicate if no version should be returned
+ if no matching versions are found, otherwise the default matching
+ rules are used to locate a hit.
+
+ ##################################################################### */
+ /*}}}*/
+#ifndef PKGLIB_POLICY_H
+#define PKGLIB_POLICY_H
+
+#include <apt-pkg/depcache.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/cacheiterators.h>
+#include <apt-pkg/versionmatch.h>
+
+#include <vector>
+#include <string>
+
+#ifndef APT_8_CLEANER_HEADERS
+using std::vector;
+#endif
+
+class pkgPolicy : public pkgDepCache::Policy
+{
+ protected:
+
+ struct Pin
+ {
+ pkgVersionMatch::MatchType Type;
+ std::string Data;
+ signed short Priority;
+ Pin() : Type(pkgVersionMatch::None), Priority(0) {};
+ };
+
+ struct PkgPin : Pin
+ {
+ std::string Pkg;
+ explicit PkgPin(std::string const &Pkg) : Pin(), Pkg(Pkg) {};
+ };
+
+ Pin *Pins;
+ Pin *VerPins;
+ signed short *PFPriority;
+ std::vector<Pin> Defaults;
+ std::vector<PkgPin> Unmatched;
+ pkgCache *Cache;
+ bool StatusOverride;
+
+ public:
+
+ // Things for manipulating pins
+ void CreatePin(pkgVersionMatch::MatchType Type,std::string Pkg,
+ std::string Data,signed short Priority);
+ pkgCache::VerIterator GetMatch(pkgCache::PkgIterator const &Pkg);
+
+ // Things for the cache interface.
+ virtual pkgCache::VerIterator GetCandidateVer(pkgCache::PkgIterator const &Pkg) APT_OVERRIDE;
+ virtual signed short GetPriority(pkgCache::PkgIterator const &Pkg) APT_OVERRIDE;
+ virtual signed short GetPriority(pkgCache::VerIterator const &Ver, bool ConsiderFiles = true) APT_OVERRIDE;
+ virtual signed short GetPriority(pkgCache::PkgFileIterator const &File) APT_OVERRIDE;
+
+ bool InitDefaults();
+
+ explicit pkgPolicy(pkgCache *Owner);
+ virtual ~pkgPolicy();
+ private:
+ void * const d;
+};
+
+bool ReadPinFile(pkgPolicy &Plcy, std::string File = "");
+bool ReadPinDir(pkgPolicy &Plcy, std::string Dir = "");
+
+#endif