[216] | 1 | /**********************************************************************
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| 2 | *
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| 3 | * filter.h --
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| 4 | * Copyright (C) 1999 The New Zealand Digital Library Project
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| 5 | *
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[534] | 6 | * A component of the Greenstone digital library software
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| 7 | * from the New Zealand Digital Library Project at the
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| 8 | * University of Waikato, New Zealand.
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[216] | 9 | *
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[534] | 10 | * This program is free software; you can redistribute it and/or modify
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| 11 | * it under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; either version 2 of the License, or
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| 13 | * (at your option) any later version.
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| 14 | *
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| 15 | * This program is distributed in the hope that it will be useful,
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | * GNU General Public License for more details.
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| 19 | *
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| 20 | * You should have received a copy of the GNU General Public License
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| 21 | * along with this program; if not, write to the Free Software
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| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | *
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[216] | 24 | *********************************************************************/
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| 25 |
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| 26 |
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| 27 | #ifndef FILTER_H
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| 28 | #define FILTER_H
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| 29 |
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| 30 | #include "gsdlconf.h"
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| 31 | #include "text_t.h"
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| 32 | #include "comtypes.h"
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| 33 |
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| 34 |
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| 35 | class filterclass {
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[226] | 36 | protected:
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| 37 | text_t gsdlhome;
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[16310] | 38 | text_t collecthome;
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[15587] | 39 | text_t dbhome;
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[226] | 40 | text_t collection;
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| 41 | text_t collectdir;
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| 42 |
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| 43 | FilterOption_tmap filterOptions;
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| 44 |
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[216] | 45 | public:
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| 46 | filterclass ();
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| 47 | virtual ~filterclass ();
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| 48 |
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| 49 | // configure should be called once for each configuration line
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[226] | 50 | // default configures the default filter options
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[216] | 51 | virtual void configure (const text_t &key, const text_tarray &cfgline);
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| 52 |
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| 53 | // init should be called after all the configuration is done but
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| 54 | // before any other methods are called
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[226] | 55 | // default checks all the filter option defaults
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[216] | 56 | virtual bool init (ostream &logout);
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| 57 |
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| 58 | // returns the name of this filter
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| 59 | virtual text_t get_filter_name ();
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| 60 |
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[226] | 61 | // returns the current filter options
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| 62 | virtual void get_filteroptions (InfoFilterOptionsResponse_t &response,
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| 63 | comerror_t &err, ostream &logout);
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[216] | 64 |
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| 65 | virtual void filter (const FilterRequest_t &request,
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| 66 | FilterResponse_t &response,
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| 67 | comerror_t &err, ostream &logout);
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[16310] | 68 |
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[216] | 69 | };
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| 70 |
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| 71 |
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[220] | 72 | // The filterptr class does not 'own' the filter. The
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| 73 | // filter should be deleted by the code which created it.
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| 74 | class filterptr {
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| 75 | public:
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| 76 | filterclass *f;
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| 77 |
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| 78 | filterptr () {f=NULL;}
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[495] | 79 | ~filterptr () {}
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[220] | 80 | };
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| 81 |
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[495] | 82 | bool operator==(const filterptr &x, const filterptr &y);
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| 83 | bool operator<(const filterptr &x, const filterptr &y);
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| 84 |
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| 85 |
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[220] | 86 | typedef map<text_t, filterptr, lttext_t> filterptrmap;
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| 87 |
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| 88 | // contains a list of filters indexed by their name
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| 89 | class filtermapclass {
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| 90 | protected:
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| 91 | filterptrmap filterptrs;
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| 92 |
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| 93 | public:
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| 94 | // type support for filterptrmap
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| 95 | typedef filterptrmap::iterator iterator;
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| 96 | typedef filterptrmap::const_iterator const_iterator;
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| 97 | typedef filterptrmap::reference reference;
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| 98 | typedef filterptrmap::const_reference const_reference;
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| 99 | typedef filterptrmap::size_type size_type;
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| 100 |
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| 101 | typedef filterptrmap::difference_type difference_type;
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| 102 | typedef filterptrmap::const_reverse_iterator const_reverse_iterator;
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| 103 | typedef filterptrmap::reverse_iterator reverse_iterator;
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| 104 |
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| 105 | // basic container support
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| 106 | iterator begin () {return filterptrs.begin();}
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| 107 | const_iterator begin () const {return filterptrs.begin();}
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| 108 | iterator end () {return filterptrs.end();}
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| 109 | const_iterator end () const {return filterptrs.end();}
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| 110 |
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| 111 | void erase(iterator pos) {filterptrs.erase(pos);}
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| 112 | void erase(iterator first, iterator last) {filterptrs.erase(first, last);}
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| 113 | filtermapclass &operator=(const filtermapclass &x) {filterptrs=x.filterptrs;return *this;}
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| 114 |
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| 115 | bool empty () const {return filterptrs.empty();}
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| 116 | size_type size() const {return filterptrs.size();}
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| 117 |
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| 118 |
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| 119 | // added functionality
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| 120 | void clear () {filterptrs.erase(filterptrs.begin(),filterptrs.end());}
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| 121 |
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| 122 | // thefilter remains the property of the calling code but
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| 123 | // should not be deleted until it is removed from this list.
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| 124 | void addfilter (filterclass *thefilter);
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| 125 |
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| 126 | // getfilter will return NULL if the filter could not be found
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| 127 | filterclass *getfilter (const text_t &key);
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| 128 | };
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| 129 |
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| 130 |
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[226] | 131 |
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| 132 | // some useful functions for dealing with document sets
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| 133 |
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| 134 | // intersect places the result in set1
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| 135 | void intersect (text_tset &set1, const text_tset &set2);
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[249] | 136 | void intersect (text_tarray &set1, const text_tset &set2);
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[472] | 137 | void intersect (text_tarray &set1, const text_tarray &set2);
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[226] | 138 |
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[235] | 139 | // tests to see if el is in set
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| 140 | bool in_set (const text_tset &set1, const text_t &el);
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[472] | 141 | bool in_set (const text_tarray &set1, const text_t &el);
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[235] | 142 |
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[216] | 143 | #endif
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