1 | /**************************************************************************
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2 | *
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3 | * Terms.h -- Query related functions
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4 | * Copyright (C) 1999 Rodger McNab
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | *
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20 | **************************************************************************/
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21 |
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22 | #ifndef TERMS_H
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23 | #define TERMS_H
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24 |
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25 | #include "IndexData.h"
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26 | #include "mglong.h"
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27 |
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28 | #if defined(GSDL_USE_OBJECTSPACE)
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29 | # include <ospace\std\iostream>
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30 | #elif defined(GSDL_USE_IOS_H)
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31 | # include <iostream.h>
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32 | #else
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33 | # include <iostream>
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34 | #endif
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35 |
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36 |
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37 | class QueryInfo {
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38 | public:
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39 | // general query information
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40 | UCArray docLevel;
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41 | mg_u_long maxDocs; // 0 = all
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42 | bool sortByRank;
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43 | bool exactWeights;
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44 |
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45 | // information need to return
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46 | bool needRankInfo;
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47 | bool needTermFreqs;
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48 |
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49 | void Clear ();
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50 | QueryInfo () { Clear (); }
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51 | };
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52 |
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53 |
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54 | class TermFreqData {
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55 | public:
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56 | UCArray tag; // level tag or query tag
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57 | UCArray term; // unstemmed term
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58 | int stemMethod;
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59 | UCArrayVector equivTerms; // the stemmed and casefolded variants of the term
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60 | mg_u_long matchDocs; // tf for level - num levels
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61 | // containing this term
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62 | mg_u_long termFreq; // overall term freq - num words that
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63 | // are this term
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64 | void Clear ();
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65 | TermFreqData () { Clear (); }
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66 | };
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67 |
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68 | ostream &operator<< (ostream &s, const TermFreqData &t);
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69 | bool operator== (const TermFreqData &t1, const TermFreqData &t2);
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70 |
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71 | typedef vector<TermFreqData> TermFreqArray;
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72 |
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73 |
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74 | typedef vector<float> RankArray;
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75 | typedef vector<mg_u_long> DocNumArray;
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76 |
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77 | class QueryResult {
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78 | public:
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79 | DocNumArray docs;
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80 | RankArray ranks; // used for accumulators during query
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81 |
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82 | TermFreqArray termFreqs;
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83 |
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84 | mg_u_long actualNumDocs;
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85 | void Clear ();
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86 | QueryResult ();
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87 | void printShort(ostream &s);
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88 | };
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89 |
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90 | ostream &operator<< (ostream &s, const QueryResult &r);
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91 | bool operator== (const QueryResult &r1, const QueryResult &r2);
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92 |
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93 | typedef vector<mg_u_long> FragNumArray;
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94 | typedef vector<mg_u_long> FragFreqArray;
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95 |
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96 | class FragData {
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97 | public:
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98 | mg_u_long matchDocs; // ft for level
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99 | FragNumArray fragNums;
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100 | FragFreqArray fragFreqs;
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101 |
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102 | void Clear ();
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103 | FragData () { Clear (); }
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104 | };
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105 |
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106 |
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107 | class FragRange {
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108 | public:
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109 | mg_u_long rangeStart;
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110 | mg_u_long rangeEnd;
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111 |
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112 | void Clear () { rangeStart = rangeEnd = 0; }
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113 | FragRange () { Clear (); }
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114 | };
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115 |
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116 | typedef vector<FragRange> FragRangeArray;
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117 |
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118 |
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119 |
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120 | void FindWordNumbers (IndexData &indexData,
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121 | const UCArray &term,
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122 | mg_u_long stemMethod,
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123 | vector<mg_u_long> &equivWords);
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124 |
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125 | void ReadTermFragData (IndexData &indexData,
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126 | bool needFragFreqs,
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127 | mg_u_long termNum,
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128 | FragData &fragData,
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129 | FragRangeArray *fragLimits,
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130 | UCArray &termWord);
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131 |
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132 | void CombineFragData (bool needFragFreqs,
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133 | const FragData &f1,
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134 | const FragData &f2,
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135 | FragData &outFragData);
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136 |
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137 | // output will be in fragData (as this is an and operation)
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138 | void AndCombineFragData (bool needFragFreqs,
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139 | FragData &fragData,
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140 | const FragData &comFragData,
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141 | mg_s_long startRange,
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142 | mg_s_long endRange,
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143 | const FragRangeArray *fragLimits);
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144 |
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145 | void FragsToQueryResult (IndexData &indexData,
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146 | const QueryInfo &queryInfo,
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147 | const FragData &termData,
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148 | const UCArray &tag,
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149 | const UCArray &term,
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150 | mg_u_long stemMethod,
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151 | mg_u_long termWeight,
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152 | UCArrayVector &equivTerms,
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153 | QueryResult &result);
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154 |
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155 | void AndFragsToQueryResult (IndexData &indexData,
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156 | const QueryInfo &queryInfo,
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157 | const FragData &termData,
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158 | const UCArray &tag,
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159 | const UCArray &term,
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160 | mg_u_long stemMethod,
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161 | mg_u_long termWeight,
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162 | UCArrayVector &equivTerms,
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163 | QueryResult &result);
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164 |
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165 | void RemoveUnwantedResults (IndexData &indexData,
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166 | const QueryInfo &queryInfo,
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167 | const FragData &termData,
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168 | QueryResult &result);
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169 |
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170 | //-----------------------------------------------------------------
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171 | // new QueryResult class to handle retrieval of doc and level nums.
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172 | // Use this class with extended version of MGQuery
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173 |
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174 | class ExtQueryResult : public QueryResult {
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175 | public:
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176 | DocNumArray levels; // used for returning a different granularity, eg
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177 | // search sections but return Document numbers, or search Documents,
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178 | // return Section numbers.
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179 |
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180 | void Clear ();
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181 | ExtQueryResult ();
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182 | };
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183 |
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184 | ostream &operator<< (ostream &s, const ExtQueryResult &r);
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185 | bool operator== (const ExtQueryResult &r1, const ExtQueryResult &r2);
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186 |
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187 | //------------------------------------------------------------
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188 | // new functions to handle full text browse
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189 |
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190 | class BrowseQueryResult {
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191 | public:
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192 | TermFreqArray termFreqs;
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193 | void Clear();
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194 | BrowseQueryResult ();
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195 |
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196 | };
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197 |
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198 |
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199 | ostream &operator<< (ostream &s, const BrowseQueryResult &r);
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200 | bool operator== (const BrowseQueryResult &r1, const BrowseQueryResult &r2);
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201 |
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202 | void FindNearestWordNumber (IndexData &indexData,
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203 | const UCArray &term,
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204 | mg_u_long &number);
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205 |
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206 | void GetTermList(IndexData &indexData,
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207 | mg_u_long startTerm,
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208 | mg_u_long numTerms,
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209 | TermFreqArray &terms);
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210 |
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211 | void GetTermList (IndexData &indexData,
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212 | mg_u_long startTerm,
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213 | mg_u_long numTerms,
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214 | UCArrayVector &terms);
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215 |
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216 | #endif
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