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1// -*- mode: cpp; mode: fold -*-
2// Description /*{{{*/
0a843901 3// $Id: policy.h,v 1.4 2001/05/07 04:24:08 jgg Exp $
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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
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36
37#include <apt-pkg/depcache.h>
38#include <apt-pkg/versionmatch.h>
39#include <vector>
40
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41using std::vector;
42
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43class pkgPolicy : public pkgDepCache::Policy
44{
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45 protected:
46
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47 struct Pin
48 {
49 pkgVersionMatch::MatchType Type;
50 string Data;
51 signed short Priority;
52 Pin() : Type(pkgVersionMatch::None), Priority(0) {};
53 };
54
55 struct PkgPin : Pin
56 {
57 string Pkg;
58 };
59
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60 Pin *Pins;
61 signed short *PFPriority;
62 vector<Pin> Defaults;
63 vector<PkgPin> Unmatched;
64 pkgCache *Cache;
65 bool StatusOverride;
66
67 public:
68
af87ab54 69 // Things for manipulating pins
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70 void CreatePin(pkgVersionMatch::MatchType Type,string Pkg,
71 string Data,signed short Priority);
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72 inline signed short GetPriority(pkgCache::PkgFileIterator const &File)
73 {return PFPriority[File->ID];};
74 signed short GetPriority(pkgCache::PkgIterator const &Pkg);
9ee8287e 75 pkgCache::VerIterator GetMatch(pkgCache::PkgIterator const &Pkg);
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76
77 // Things for the cache interface.
9ee8287e 78 virtual pkgCache::VerIterator GetCandidateVer(pkgCache::PkgIterator const &Pkg);
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79 virtual bool IsImportantDep(pkgCache::DepIterator Dep) {return pkgDepCache::Policy::IsImportantDep(Dep);};
80 bool InitDefaults();
81
82 pkgPolicy(pkgCache *Owner);
83 virtual ~pkgPolicy() {delete [] PFPriority; delete [] Pins;};
84};
85
86bool ReadPinFile(pkgPolicy &Plcy,string File = "");
e68ca100 87bool ReadPinDir(pkgPolicy &Plcy,string Dir = "");
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88
89#endif