| 1 | /**********************************************************************
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| 2 | *
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| 3 | * mgqueryfilter.h -- queryfilter for old mg
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| 4 | * Copyright (C) 1999 The New Zealand Digital Library Project
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| 5 | *
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| 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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| 9 | *
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| 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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| 24 | * $Id: mgqueryfilter.h 1674 2000-11-16 03:19:13Z nzdl $
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| 25 | *
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| 26 | *********************************************************************/
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| 27 |
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| 28 |
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| 29 | #ifndef MGQUERYFILTER_H
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| 30 | #define MGQUERYFILTER_H
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| 31 |
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| 32 | #include "queryfilter.h"
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| 33 |
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| 34 | // resultsorderer_t is used to sort the query results
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| 35 | struct resultsorderer_t {
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| 36 | bool compare_phrase_match;
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| 37 | bool compare_terms_match;
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| 38 | bool compare_doc_weight;
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| 39 | docresultmap *docset;
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| 40 |
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| 41 | resultsorderer_t();
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| 42 | void clear();
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| 43 | bool operator()(const int &t1, const int &t2) const;
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| 44 | };
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| 45 |
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| 46 |
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| 47 |
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| 48 | class mgqueryfilterclass : public queryfilterclass {
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| 49 | protected:
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| 50 |
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| 51 | int num_phrases;
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| 52 |
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| 53 | void get_phrase_terms (const text_t &querystring,
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| 54 | const termfreqclassarray &orgterms,
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| 55 | vector<termfreqclassarray> &phrases);
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| 56 |
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| 57 | // do aditional query processing
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| 58 | virtual void post_process (const queryparamclass &queryparams,
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| 59 | queryresultsclass &queryresults);
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| 60 |
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| 61 | // do query that might involve multiple sub queries
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| 62 | // mgsearchptr and gdbmptr are assumed to be valid
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| 63 | void do_multi_query (const FilterRequest_t &request,
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| 64 | const vector<queryparamclass> &query_params,
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| 65 | queryresultsclass &multiresults,
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| 66 | comerror_t &err, ostream &logout);
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| 67 |
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| 68 | virtual void sort_doc_results (const FilterRequest_t &request,
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| 69 | docresultsclass &docs);
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| 70 |
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| 71 | virtual void mg_parse_query_params (const FilterRequest_t &request,
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| 72 | vector<queryparamclass> &query_params,
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| 73 | int &startresults, int &endresults,
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| 74 | text_t &phrasematch, ostream &logout);
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| 75 |
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| 76 |
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| 77 | public:
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| 78 | mgqueryfilterclass ();
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| 79 | virtual ~mgqueryfilterclass ();
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| 80 |
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| 81 | void filter (const FilterRequest_t &request,
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| 82 | FilterResponse_t &response,
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| 83 | comerror_t &err, ostream &logout);
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| 84 | };
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| 85 |
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| 86 |
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| 87 | #endif
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| 88 |
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