1 | /**********************************************************************
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2 | *
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3 | * sqlbrowsefilter.cpp --
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4 | * Copyright (C) 2008 DL Consulting Ltd
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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 | #include "sqlbrowsefilter.h"
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27 | #include "fileutil.h"
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28 |
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29 |
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30 | sqlbrowsefilterclass::sqlbrowsefilterclass ()
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31 | {
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32 | sql_db_ptr = NULL;
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33 | }
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34 |
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35 |
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36 | sqlbrowsefilterclass::~sqlbrowsefilterclass ()
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37 | {
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38 | }
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39 |
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40 |
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41 | void sqlbrowsefilterclass::configure (const text_t &key, const text_tarray &cfgline)
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42 | {
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43 | filterclass::configure (key, cfgline);
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44 |
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45 | if (key == "indexstem")
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46 | {
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47 | indexstem = cfgline[0];
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48 | }
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49 | }
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50 |
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51 |
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52 | bool sqlbrowsefilterclass::init (ostream &logout)
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53 | {
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54 | outconvertclass text_t2ascii;
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55 |
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56 | if (!filterclass::init(logout)) return false;
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57 |
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58 | if (sql_db_ptr == NULL)
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59 | {
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60 | // most likely a configuration problem
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61 | logout << text_t2ascii
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62 | << "configuration error: sqlbrowsefilter contains a null sqldbclass\n\n";
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63 | return false;
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64 | }
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65 |
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66 | if (indexstem.empty())
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67 | {
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68 | indexstem = collection;
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69 | }
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70 |
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71 | // get the filename for the database and make sure it exists
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72 | sql_db_filename = filename_cat(dbhome, "collect", collection, "index", "text", indexstem);
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73 | sql_db_filename += sql_db_ptr->getfileextension();
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74 | if (!file_exists(sql_db_filename))
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75 | {
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76 | logout << text_t2ascii
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77 | << "warning: database \"" << sql_db_filename << "\" does not exist\n\n";
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78 | return false;
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79 | }
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80 |
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81 | return true;
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82 | }
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83 |
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84 |
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85 | void sqlbrowsefilterclass::filter (const FilterRequest_t &request,
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86 | FilterResponse_t &response,
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87 | comerror_t &err, ostream &logout)
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88 | {
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89 | outconvertclass text_t2ascii;
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90 |
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91 | response.clear();
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92 | err = noError;
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93 |
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94 | if (sql_db_ptr == NULL) {
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95 | // most likely a configuration problem
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96 | logout << text_t2ascii
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97 | << "configuration error: sqlbrowsefilter contains a null sqldbclass\n\n";
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98 | err = configurationError;
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99 | return;
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100 | }
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101 |
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102 | // open the database
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103 | sql_db_ptr->setlogout (&logout);
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104 | if (!sql_db_ptr->opendatabase (sql_db_filename, DB_READER, 100, false)) {
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105 | // most likely a system problem (we have already checked that the database exists)
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106 | logout << text_t2ascii
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107 | << "system problem: open on database \""
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108 | << sql_db_filename << "\" failed\n\n";
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109 | err = systemProblem;
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110 | return;
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111 | }
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112 |
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113 | if ((request.filterResultOptions & FRmetadataValues) && !request.fields.empty())
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114 | {
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115 | text_t metadata_element_name = *(request.fields.begin());
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116 | logout << text_t2ascii << "Requesting metadata values for " << metadata_element_name << "...\n";
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117 | text_tarray metadata_values = sql_db_ptr->getmetadatavalues (metadata_element_name);
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118 | text_tarray::iterator metadata_value_iterator = metadata_values.begin();
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119 | while (metadata_value_iterator != metadata_values.end())
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120 | {
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121 | ResultDocInfo_t metadata_value_result_doc;
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122 | metadata_value_result_doc.OID = *metadata_value_iterator;
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123 | response.docInfo.push_back (metadata_value_result_doc);
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124 |
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125 | metadata_value_iterator++;
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126 | }
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127 | }
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128 |
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129 | sql_db_ptr->closedatabase(); // Important that local library doesn't leave any files open
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130 | }
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