| 1 | /**********************************************************************
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| 2 | *
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| 3 | * queryfilter.cpp --
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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 | *********************************************************************/
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| 25 |
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| 26 |
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| 27 |
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| 28 | #include "mgppqueryfilter.h"
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| 29 | #include "fileutil.h"
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| 30 | #include <assert.h>
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| 31 | #include "mgppsearch.h"
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| 32 |
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| 33 | /////////////////////////////////
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| 34 | // functions for queryfilterclass
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| 35 | /////////////////////////////////
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| 36 |
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| 37 |
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| 38 | mgppqueryfilterclass::mgppqueryfilterclass ()
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| 39 | : queryfilterclass() {
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| 40 |
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| 41 |
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| 42 | FilterOption_t filtopt;
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| 43 |
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| 44 | // -- onePerTerm Level enumerated
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| 45 | // likely to be Doc, Sec, Para, but we dont assume anything now
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| 46 | filtopt.clear();
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| 47 | filtopt.name = "Level";
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| 48 | filtopt.type = FilterOption_t::enumeratedt;
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| 49 | filtopt.repeatable = FilterOption_t::onePerTerm;
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| 50 | filterOptions["Level"] = filtopt;
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| 51 |
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| 52 | // -- IndexField, enumerated, used to list available fields
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| 53 | filtopt.clear();
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| 54 | filtopt.name = "IndexField";
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| 55 | filtopt.type = FilterOption_t::enumeratedt;
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| 56 | filtopt.repeatable = FilterOption_t::onePerTerm;
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| 57 | filtopt.defaultValue = "";
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| 58 | filterOptions["IndexField"] = filtopt;
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| 59 |
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| 60 | }
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| 61 |
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| 62 | mgppqueryfilterclass::~mgppqueryfilterclass () {
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| 63 | }
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| 64 |
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| 65 |
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| 66 | //whether a query is a full text browse
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| 67 | bool mgppqueryfilterclass::full_text_browse (int filterRequestOptions) {
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| 68 | return (filterRequestOptions & FRfullTextBrowse);
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| 69 | }
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| 70 |
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| 71 | void mgppqueryfilterclass::configure (const text_t &key, const text_tarray &cfgline) {
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| 72 | queryfilterclass::configure(key, cfgline);
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| 73 |
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| 74 | if (key == "indexfieldmap") {
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| 75 | indexfieldmap.importmap (cfgline);
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| 76 |
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| 77 | // update the list of indexes in the filter information
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| 78 | text_tarray options;
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| 79 | indexfieldmap.gettoarray (options);
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| 80 | filterOptions["IndexField"].validValues = options;
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| 81 |
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| 82 | } else if (key == "indexlevels") {
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| 83 | text_tarray::const_iterator here = cfgline.begin();
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| 84 | text_tarray::const_iterator end = cfgline.end();
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| 85 | bool first=true;
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| 86 | filterOptions["Level"].validValues.erase(filterOptions["Level"].validValues.begin(), filterOptions["Level"].validValues.end());
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| 87 | while (here != end) {
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| 88 | if (!(*here).empty()) {
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| 89 | if (first) {
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| 90 | first = false;
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| 91 | // the default is the first value
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| 92 | filterOptions["Level"].defaultValue = *here;
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| 93 | }
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| 94 | filterOptions["Level"].validValues.push_back(*here);
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| 95 | }
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| 96 | ++here;
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| 97 | }
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| 98 | } else if (key == "textlevel") {
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| 99 | ((mgppsearchclass *)textsearchptr)->set_gdbm_level( cfgline[0]);
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| 100 | } else if (key == "indexstem") {
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| 101 | ((mgppsearchclass *)textsearchptr)->set_indexstem (cfgline[0]);
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| 102 | } else if (key == "defaultindex") { // used for fields in mgpp
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| 103 | indexfieldmap.from2to (cfgline[0], filterOptions["IndexField"].defaultValue);
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| 104 | }
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| 105 |
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| 106 | }
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| 107 |
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| 108 | bool mgppqueryfilterclass::init (ostream &logout) {
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| 109 |
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| 110 | if (!queryfilterclass::init(logout)) {
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| 111 | return false;
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| 112 | }
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| 113 |
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| 114 | if (filterOptions["IndexField"].defaultValue.empty()) {
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| 115 | // use first index in map as default if no default is set explicitly
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| 116 | text_tarray fromarray;
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| 117 | indexfieldmap.getfromarray(fromarray);
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| 118 | if (fromarray.size()) {
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| 119 | filterOptions["IndexField"].defaultValue = fromarray[0];
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| 120 | }
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| 121 | }
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| 122 | return true;
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| 123 | }
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| 124 |
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| 125 | void mgppqueryfilterclass::filter(const FilterRequest_t &request,
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| 126 | FilterResponse_t &response,
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| 127 | comerror_t &err, ostream &logout) {
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| 128 |
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| 129 |
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| 130 | outconvertclass text_t2ascii;
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| 131 |
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| 132 | response.clear ();
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| 133 | err = noError;
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| 134 | if (gdbmptr == NULL) {
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| 135 | // most likely a configuration problem
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| 136 | logout << text_t2ascii
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| 137 | << "configuration error: queryfilter contains a null gdbmclass\n\n";
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| 138 | err = configurationError;
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| 139 | return;
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| 140 | }
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| 141 | if (textsearchptr == NULL) {
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| 142 | // most likely a configuration problem
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| 143 | logout << text_t2ascii
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| 144 | << "configuration error: queryfilter contains a null textsearchclass for mgpp\n\n";
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| 145 | err = configurationError;
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| 146 | return;
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| 147 | }
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| 148 | if (full_text_browse(request.filterResultOptions)) {
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| 149 | browsefilter(request, response, err, logout);
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| 150 | return;
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| 151 | }
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| 152 | // open the database
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| 153 | gdbmptr->setlogout(&logout);
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| 154 | if (!gdbmptr->opendatabase (gdbm_filename, GDBM_READER, 100, false)) {
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| 155 | // most likely a system problem (we have already checked that the
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| 156 | // gdbm database exists)
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| 157 | logout << text_t2ascii
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| 158 | << "system problem: open on gdbm database \""
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| 159 | << gdbm_filename << "\" failed\n\n";
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| 160 | err = systemProblem;
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| 161 | return;
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| 162 | }
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| 163 |
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| 164 |
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| 165 | // get the query parameters
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| 166 | int startresults, endresults;
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| 167 | text_t phrasematch; // not used here any more
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| 168 | vector<queryparamclass> queryfilterparams;
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| 169 | parse_query_params (request, queryfilterparams, startresults,
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| 170 | endresults, phrasematch, logout);
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| 171 |
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| 172 |
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| 173 | // do query
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| 174 | queryresultsclass queryresults;
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| 175 | do_multi_query (request, queryfilterparams, queryresults, err, logout);
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| 176 | if (err != noError) return;
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| 177 | // assemble document results
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| 178 | if (need_matching_docs (request.filterResultOptions)) {
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| 179 |
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| 180 | int resultnum = 1;
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| 181 | ResultDocInfo_t resultdoc;
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| 182 | text_t trans_OID;
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| 183 | vector<int>::iterator docorder_here = queryresults.docs.docorder.begin();
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| 184 | vector<int>::iterator docorder_end = queryresults.docs.docorder.end();
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| 185 |
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| 186 | if (endresults == -1) endresults = MAXNUMDOCS;
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| 187 | while (docorder_here != docorder_end) {
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| 188 | if (resultnum > endresults) break;
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| 189 |
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| 190 | // translate the document number
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| 191 | if (!translate(gdbmptr, *docorder_here, trans_OID)) {
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| 192 | logout << text_t2ascii
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| 193 | << "warning: could not translate mgpp document number \""
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| 194 | << *docorder_here << "\"to OID.\n\n";
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| 195 |
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| 196 | } else {
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| 197 | docresultmap::iterator docset_here = queryresults.docs.docset.find (*docorder_here);
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| 198 |
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| 199 | // see if there is a result for this number,
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| 200 | // if it is in the request set (or the request set is empty)
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| 201 | if (docset_here != queryresults.docs.docset.end() &&
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| 202 | (request.docSet.empty() || in_set(request.docSet, trans_OID))) {
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| 203 | if (resultnum >= startresults) {
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| 204 | // add this document
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| 205 | resultdoc.OID = trans_OID;
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| 206 | resultdoc.result_num = resultnum;
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| 207 | resultdoc.ranking = (int)((*docset_here).second.docweight * 10000.0 + 0.5);
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| 208 |
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| 209 | response.docInfo.push_back (resultdoc);
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| 210 | }
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| 211 |
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| 212 | ++resultnum;
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| 213 | }
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| 214 | } // else
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| 215 |
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| 216 | ++docorder_here;
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| 217 | }
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| 218 | } // if need matching docs
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| 219 |
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| 220 | // assemble the term results
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| 221 | if (need_term_info(request.filterResultOptions)) {
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| 222 | // note: the terms have already been sorted and uniqued - ?? have they??
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| 223 |
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| 224 | TermInfo_t terminfo;
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| 225 | bool terms_first = true;
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| 226 |
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| 227 | termfreqclassarray::iterator terms_here = queryresults.terms.begin();
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| 228 | termfreqclassarray::iterator terms_end = queryresults.terms.end();
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| 229 |
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| 230 | while (terms_here != terms_end) {
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| 231 | terminfo.clear();
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| 232 | terminfo.term = (*terms_here).termstr;
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| 233 | terminfo.freq = (*terms_here).termfreq;
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| 234 |
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| 235 | // this bit gets the matchTerms ie the equivalent (stem/casefold) terms
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| 236 | if (terms_first) {
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| 237 | text_tset::iterator termvariants_here = queryresults.termvariants.begin();
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| 238 | text_tset::iterator termvariants_end = queryresults.termvariants.end();
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| 239 | while (termvariants_here != termvariants_end) {
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| 240 | terminfo.matchTerms.push_back (*termvariants_here);
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| 241 | ++termvariants_here;
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| 242 | }
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| 243 | }
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| 244 | terms_first = false;
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| 245 |
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| 246 | response.termInfo.push_back (terminfo);
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| 247 |
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| 248 | ++terms_here;
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| 249 | }
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| 250 | }
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| 251 |
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| 252 | response.numDocs = queryresults.docs_matched;
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| 253 | response.isApprox = queryresults.is_approx;
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| 254 | }
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| 255 |
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| 256 | void mgppqueryfilterclass::browsefilter(const FilterRequest_t &request,
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| 257 | FilterResponse_t &response,
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| 258 | comerror_t &err, ostream &logout) {
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| 259 |
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| 260 | outconvertclass text_t2ascii;
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| 261 |
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| 262 | // get the query parameters
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| 263 | int startresults, endresults;
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| 264 | text_t phrasematch; // not used here any more, just have it so can use
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| 265 | // parse_query_params function
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| 266 |
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| 267 | vector<queryparamclass> queryfilterparams;
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| 268 | parse_query_params (request, queryfilterparams, startresults,
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| 269 | endresults, phrasematch, logout);
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| 270 |
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| 271 | vector<queryparamclass>::const_iterator query_here = queryfilterparams.begin();
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| 272 |
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| 273 | // do query
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| 274 | queryresultsclass queryresults;
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| 275 | queryresults.clear();
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| 276 |
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| 277 | int numDocs = endresults-startresults;
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| 278 | textsearchptr->setcollectdir (collectdir);
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| 279 |
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| 280 | if (!((mgppsearchclass*)textsearchptr)->browse_search((*query_here), startresults, numDocs, queryresults)) {
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| 281 | // most likely a system problem
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| 282 | logout << text_t2ascii
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| 283 | << "system problem: could not do full text browse with mgpp for index \""
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| 284 | << (*query_here).index << (*query_here).subcollection
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| 285 | << (*query_here).language << "\".\n\n";
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| 286 | err = systemProblem;
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| 287 | return;
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| 288 | }
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| 289 |
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| 290 | // assemble the term results
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| 291 | TermInfo_t terminfo;
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| 292 |
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| 293 | termfreqclassarray::iterator terms_here = queryresults.terms.begin();
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| 294 | termfreqclassarray::iterator terms_end = queryresults.terms.end();
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| 295 |
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| 296 | while (terms_here != terms_end) {
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| 297 | terminfo.clear();
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| 298 | terminfo.term = (*terms_here).termstr;
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| 299 | terminfo.freq = (*terms_here).termfreq;
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| 300 |
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| 301 | response.termInfo.push_back (terminfo);
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| 302 |
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| 303 | ++terms_here;
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| 304 | }
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| 305 |
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| 306 |
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| 307 | }
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| 308 |
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| 309 | // mgppsearchptr and gdbmptr are assumed to be valid
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| 310 | void mgppqueryfilterclass::do_multi_query (const FilterRequest_t &request,
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| 311 | const vector<queryparamclass> &query_params,
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| 312 | queryresultsclass &multiresults,
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| 313 | comerror_t &err, ostream &logout) {
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| 314 | outconvertclass text_t2ascii;
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| 315 |
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| 316 | err = noError;
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| 317 | textsearchptr->setcollectdir (collectdir);
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| 318 | multiresults.clear();
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| 319 |
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| 320 | vector<queryparamclass>::const_iterator query_here = query_params.begin();
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| 321 | vector<queryparamclass>::const_iterator query_end = query_params.end();
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| 322 | while (query_here != query_end) {
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| 323 | queryresultsclass thisqueryresults;
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| 324 | text_t indx((*query_here).index);
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| 325 | if (!textsearchptr->search((*query_here), thisqueryresults)) {
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| 326 | // most likely a system problem
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| 327 | logout << text_t2ascii
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| 328 | << "system problem: could not do search with mgpp for index \""
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| 329 | << (*query_here).index << (*query_here).subcollection
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| 330 | << (*query_here).language << "\".\n\n";
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| 331 | err = systemProblem;
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| 332 | return;
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| 333 | }
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| 334 |
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| 335 | // check for syntax error
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| 336 | if (thisqueryresults.syntax_error==true) {
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| 337 | logout << text_t2ascii
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| 338 | << "syntax problem: invalid query string \""
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| 339 | << (*query_here).querystring<<"\".\n";
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| 340 | err = syntaxError;
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| 341 | return;
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| 342 | }
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| 343 | // combine the results
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| 344 | if (need_matching_docs (request.filterResultOptions)) {
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| 345 |
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| 346 | if (query_params.size() == 1) {
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| 347 | multiresults.docs = thisqueryresults.docs; // just one set of results
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| 348 | multiresults.docs_matched = thisqueryresults.docs_matched;
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| 349 | multiresults.is_approx = thisqueryresults.is_approx;
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| 350 |
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| 351 | } else {
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| 352 | if ((*query_here).combinequery == "and") {
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| 353 | multiresults.docs.combine_and (thisqueryresults.docs);
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| 354 | } else if ((*query_here).combinequery == "or") {
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| 355 | multiresults.docs.combine_or (thisqueryresults.docs);
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| 356 | } else if ((*query_here).combinequery == "not") {
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| 357 | multiresults.docs.combine_not (thisqueryresults.docs);
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| 358 | }
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| 359 | multiresults.docs_matched = multiresults.docs.docset.size();
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| 360 | multiresults.is_approx = Exact;
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| 361 | }
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| 362 | }
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| 363 |
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| 364 | // combine the term information
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| 365 | if (need_term_info (request.filterResultOptions)) {
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| 366 | // append the terms
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| 367 | multiresults.orgterms.insert(multiresults.orgterms.end(),
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| 368 | thisqueryresults.orgterms.begin(),
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| 369 | thisqueryresults.orgterms.end());
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| 370 |
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| 371 |
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| 372 | // add the term variants -
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| 373 | text_tset::iterator termvar_here = thisqueryresults.termvariants.begin();
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| 374 | text_tset::iterator termvar_end = thisqueryresults.termvariants.end();
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| 375 | while (termvar_here != termvar_end) {
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| 376 | multiresults.termvariants.insert(*termvar_here);
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| 377 | ++termvar_here;
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| 378 | }
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| 379 | }
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| 380 |
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| 381 | ++query_here;
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| 382 | }
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| 383 |
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| 384 | // sort and unique the query terms
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| 385 | multiresults.sortuniqqueryterms ();
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| 386 | }
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| 387 |
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| 388 |
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| 389 |
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