1 | /**********************************************************************
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2 | *
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3 | * browsefilter.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 | * PUT COPYRIGHT NOTICE HERE
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7 | *
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8 | * $Id: browsefilter.cpp 259 1999-05-10 03:43:49Z sjboddie $
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9 | *
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10 | *********************************************************************/
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11 |
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12 | /*
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13 | $Log$
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14 | Revision 1.4 1999/05/10 03:43:47 sjboddie
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15 | lots of changes to lots of files - getting document action going
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16 |
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17 | Revision 1.3 1999/04/30 02:00:45 sjboddie
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18 | lots of stuff to do with getting documentaction working
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19 |
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20 | Revision 1.2 1999/04/19 23:56:05 rjmcnab
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21 | Finished the gdbm metadata stuff
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22 |
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23 | Revision 1.1 1999/04/06 22:22:08 rjmcnab
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24 | Initial revision.
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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 | #include "browsefilter.h"
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30 | #include "fileutil.h"
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31 |
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32 |
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33 | browsefilterclass::browsefilterclass () {
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34 | gdbmptr = NULL;
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35 |
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36 | // -- onePerQuery StartResults integer
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37 | FilterOption_t filtopt;
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38 | filtopt.name = "StartResults";
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39 | filtopt.type = FilterOption_t::integert;
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40 | filtopt.repeatable = FilterOption_t::onePerQuery;
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41 | filtopt.defaultValue = "1";
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42 | filtopt.validValues.push_back("1");
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43 | filtopt.validValues.push_back("10000");
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44 | filterOptions["StartResults"] = filtopt;
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45 |
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46 | // -- onePerQuery EndResults integer
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47 | filtopt.clear();
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48 | filtopt.name = "EndResults";
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49 | filtopt.type = FilterOption_t::integert;
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50 | filtopt.repeatable = FilterOption_t::onePerQuery;
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51 | filtopt.defaultValue = "10000";
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52 | filtopt.validValues.push_back("1");
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53 | filtopt.validValues.push_back("10000");
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54 | filterOptions["EndResults"] = filtopt;
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55 |
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56 | // -- onePerQuery ParentNode string ("" will return the browsing available)
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57 | filtopt.clear();
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58 | filtopt.name = "ParentNode";
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59 | filtopt.type = FilterOption_t::stringt;
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60 | filtopt.repeatable = FilterOption_t::onePerQuery;
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61 | filtopt.defaultValue = "";
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62 | filterOptions["ParentNode"] = filtopt;
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63 | }
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64 |
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65 | browsefilterclass::~browsefilterclass () {
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66 | }
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67 |
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68 | bool browsefilterclass::init (ostream &logout) {
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69 | outconvertclass text_t2ascii;
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70 |
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71 | if (!filterclass::init(logout)) return false;
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72 |
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73 | // get the filename for the database and make sure it exists
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74 | gdbm_filename = filename_cat(collectdir,"index","text",collection);
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75 | #ifdef _LITTLE_ENDIAN
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76 | gdbm_filename += ".ldb";
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77 | #else
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78 | gdbm_filename += ".bdb";
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79 | #endif
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80 | if (!file_exists(gdbm_filename)) {
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81 | logout << text_t2ascii
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82 | << "error: gdbm database \""
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83 | << gdbm_filename << "\" does not exist\n\n";
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84 | return false;
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85 | }
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86 |
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87 | return true;
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88 | }
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89 |
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90 | void browsefilterclass::filter (const FilterRequest_t &request,
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91 | FilterResponse_t &response,
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92 | comerror_t &err, ostream &logout) {
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93 | int numDocs = 0;
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94 | outconvertclass text_t2ascii;
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95 |
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96 | response.clear ();
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97 | err = noError;
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98 | if (gdbmptr == NULL) {
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99 | // most likely a configuration problem
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100 | logout << text_t2ascii
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101 | << "configuration error: browsefilter contains a null gdbmclass\n\n";
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102 | err = configurationError;
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103 | return;
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104 | }
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105 |
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106 | // open the database
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107 | gdbmptr->setlogout(&logout);
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108 | if (!gdbmptr->opendatabase (gdbm_filename)) {
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109 | // most likely a system problem (we have already checked that the
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110 | // gdbm database exists)
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111 | logout << text_t2ascii
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112 | << "system problem: open on gdbm database \""
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113 | << gdbm_filename << "\" failed\n\n";
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114 | err = systemProblem;
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115 | return;
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116 | }
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117 |
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118 | // get the browse parameters
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119 | int startresults = filterOptions["StartResults"].defaultValue.getint();
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120 | int endresults = filterOptions["EndResults"].defaultValue.getint();
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121 | text_t parentnode = filterOptions["ParentNode"].defaultValue;
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122 | OptionValue_tarray::const_iterator options_here = request.filterOptions.begin();
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123 | OptionValue_tarray::const_iterator options_end = request.filterOptions.end();
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124 | while (options_here != options_end) {
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125 | if ((*options_here).name == "StartResults")
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126 | startresults = (*options_here).value.getint();
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127 | else if ((*options_here).name == "EndResults")
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128 | endresults = (*options_here).value.getint();
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129 | else if ((*options_here).name == "ParentNode")
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130 | parentnode = (*options_here).value;
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131 | else {
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132 | logout << text_t2ascii
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133 | << "warning: unknown browsefilter option \""
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134 | << (*options_here).name
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135 | << "\" ignored.\n\n";
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136 | }
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137 |
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138 | options_here++;
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139 | }
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140 |
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141 | infodbclass info;
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142 |
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143 | // translate any ".fc", ".pr" etc. stuff in the parentnode
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144 | parentnode = gdbmptr->translate_OID (parentnode, info);
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145 |
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146 | // adjust topmost browsing node
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147 | if (parentnode.empty()) parentnode = "browse";
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148 |
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149 | // get the node
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150 | if ((request.filterResultOptions & FROID) ||
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151 | (request.filterResultOptions & FRmetadata)) {
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152 | if (!gdbmptr->getinfo(parentnode, info)) {
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153 | // didn't find the node
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154 | logout << text_t2ascii
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155 | << "warning: lookup for node \"" << parentnode
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156 | << "\" failed for browsefilter.\n\n";
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157 | } else {
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158 | // found the node
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159 |
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160 | // replace " with the parent node name and split the contains string
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161 | // into the result set
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162 | text_tarray resultset;
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163 | text_t tmptext;
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164 | text_t &contains = info["contains"];
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165 | text_t::iterator contains_here = contains.begin();
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166 | text_t::iterator contains_end = contains.end();
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167 | while (contains_here != contains_end) {
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168 | if (*contains_here == '"') tmptext += parentnode;
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169 | else if (*contains_here == ';') {
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170 | if (!tmptext.empty()) resultset.push_back (tmptext);
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171 | tmptext.clear();
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172 | } else tmptext.push_back(*contains_here);
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173 |
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174 | contains_here++;
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175 | }
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176 | // insert the last result in the set
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177 | if (!tmptext.empty()) resultset.push_back (tmptext);
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178 |
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179 | // do an intersection with the input set
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180 | if (!request.docSet.empty()) {
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181 | intersect (resultset, request.docSet);
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182 | }
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183 |
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184 | // create the response
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185 | numDocs = resultset.size();
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186 | int resultnum = 1;
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187 | ResultDocInfo_t resultdoc;
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188 | text_tarray::iterator result_here = resultset.begin();
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189 | text_tarray::iterator result_end = resultset.end();
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190 |
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191 | while (result_here != result_end) {
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192 | if (resultnum > endresults) break;
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193 | if (resultnum >= startresults) {
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194 | resultdoc.OID = (*result_here);
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195 | response.docInfo.push_back(resultdoc);
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196 | }
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197 |
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198 | resultnum++;
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199 | result_here++;
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200 | }
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201 | }
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202 | }
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203 |
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204 | response.numDocs = numDocs;
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205 | response.isApprox = false;
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206 | }
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