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Commit	Line	Data
	1	// -- mode: cpp; mode: fold --
	2	// Description /{{{/
	3	// $Id: policy.h,v 1.4 2001/05/07 04:24:08 jgg Exp $
	4	/* ######################################################################
	5
	6	Package Version Policy implementation
	7
	8	This implements the more advanced 'Version 4' APT policy engine. The
	9	standard 'Version 0' engine is included inside the DepCache which is
	10	it's historical location.
	11
	12	The V4 engine allows the user to completly control all aspects of
	13	version selection. There are three primary means to choose a version
	14	* Selection by version match
	15	* Selection by Release file match
	16	* Selection by origin server
	17
	18	Each package may be 'pinned' with a single criteria, which will ultimately
	19	result in the selection of a single version, or no version, for each
	20	package.
	21
	22	Furthermore, the default selection can be influenced by specifying
	23	the ordering of package files. The order is derived by reading the
	24	package file preferences and assigning a priority to each package
	25	file.
	26
	27	A special flag may be set to indicate if no version should be returned
	28	if no matching versions are found, otherwise the default matching
	29	rules are used to locate a hit.
	30
	31	##################################################################### */
	32	/}}}/
	33	#ifndef PKGLIB_POLICY_H
	34	#define PKGLIB_POLICY_H
	35
	36	#include <apt-pkg/depcache.h>
	37	#include <apt-pkg/pkgcache.h>
	38	#include <apt-pkg/cacheiterators.h>
	39	#include <apt-pkg/versionmatch.h>
	40
	41	#include <vector>
	42	#include <string>
	43
	44	#ifndef APT_8_CLEANER_HEADERS
	45	using std::vector;
	46	#endif
	47
	48	class pkgPolicy : public pkgDepCache::Policy
	49	{
	50	protected:
	51
	52	struct Pin
	53	{
	54	pkgVersionMatch::MatchType Type;
	55	std::string Data;
	56	signed short Priority;
	57	Pin() : Type(pkgVersionMatch::None), Priority(0) {};
	58	};
	59
	60	struct PkgPin : Pin
	61	{
	62	std::string Pkg;
	63	PkgPin(std::string const &Pkg) : Pin(), Pkg(Pkg) {};
	64	};
	65
	66	Pin *Pins;
	67	signed short *PFPriority;
	68	std::vector<Pin> Defaults;
	69	std::vector<PkgPin> Unmatched;
	70	pkgCache *Cache;
	71	bool StatusOverride;
	72
	73	public:
	74
	75	// Things for manipulating pins
	76	void CreatePin(pkgVersionMatch::MatchType Type,std::string Pkg,
	77	std::string Data,signed short Priority);
	78	pkgCache::VerIterator GetMatch(pkgCache::PkgIterator const &Pkg);
	79
	80	// Things for the cache interface.
	81	virtual pkgCache::VerIterator GetCandidateVer(pkgCache::PkgIterator const &Pkg);
	82	virtual signed short GetPriority(pkgCache::PkgIterator const &Pkg);
	83	virtual signed short GetPriority(pkgCache::PkgFileIterator const &File);
	84
	85	bool InitDefaults();
	86
	87	pkgPolicy(pkgCache *Owner);
	88	virtual ~pkgPolicy() {delete [] PFPriority; delete [] Pins;};
	89	};
	90
	91	bool ReadPinFile(pkgPolicy &Plcy, std::string File = "");
	92	bool ReadPinDir(pkgPolicy &Plcy, std::string Dir = "");
	93
	94	#endif