1 | /**********************************************************************
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2 | *
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3 | * tdbclass.cpp --
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4 | *
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5 | * Copyright (C) 2011 The New Zealand Digital Library Project
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6 | *
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7 | * A component of the Greenstone digital library software
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8 | * from the New Zealand Digital Library Project at the
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9 | * University of Waikato, New Zealand.
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10 | *
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11 | * This program is free software; you can redistribute it and/or modify
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12 | * it under the terms of the GNU General Public License as published by
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13 | * the Free Software Foundation; either version 2 of the License, or
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14 | * (at your option) any later version.
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15 | *
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16 | * This program is distributed in the hope that it will be useful,
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | * GNU General Public License for more details.
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20 | *
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21 | * You should have received a copy of the GNU General Public License
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22 | * along with this program; if not, write to the Free Software
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23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 | *
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25 | *********************************************************************/
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26 |
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27 | #include "tdbclass.h"
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28 |
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29 | #include "gsdltools.h"
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30 | #include "gsdlunicode.h"
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31 | #include "fileutil.h"
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32 | #include "stdlib.h"
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33 | #include <cstring>
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34 |
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35 |
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36 | tdbclass::tdbclass(const text_t& gsdlhome)
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37 | : dbclass(gsdlhome)
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38 | {
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39 | tdb = NULL;
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40 | }
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41 |
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42 | tdbclass::~tdbclass()
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43 | {
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44 | closedatabase();
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45 | }
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46 |
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47 |
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48 | // returns true if opened
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49 | bool
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50 | tdbclass::opendatabase (const text_t &filename, int mode, int num_retrys, bool need_filelock)
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51 | {
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52 |
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53 | if (tdb != NULL)
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54 | {
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55 | if (openfile == filename)
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56 | {
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57 | return true;
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58 | }
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59 | else
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60 | {
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61 | closedatabase();
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62 | }
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63 | }
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64 |
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65 | // Map the DB mode values into TDB mode values
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66 | int file_mode = O_RDONLY;
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67 | if (mode == DB_WRITER)
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68 | {
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69 | file_mode = O_RDWR;
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70 | }
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71 | else if (mode == DB_WRITER_CREATE)
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72 | {
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73 | file_mode = O_RDWR | O_CREAT;
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74 | }
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75 |
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76 | char *namebuffer = filename.getcstr();
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77 | int hash_size = 0;
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78 | do
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79 | {
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80 | tdb = tdb_open(namebuffer, hash_size, TDB_DEFAULT, file_mode, 0664);
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81 | --num_retrys;
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82 | } while (num_retrys > 0 && tdb==NULL);
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83 |
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84 | delete []namebuffer;
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85 |
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86 | if (tdb == NULL && logout != NULL)
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87 | {
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88 | outconvertclass text_t2ascii;
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89 | (*logout) << text_t2ascii << "database open failed on: " << filename << "\n";
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90 | }
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91 |
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92 | openfile = filename;
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93 |
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94 | return (tdb != NULL);
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95 | }
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96 | /** opendatabase() **/
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97 |
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98 |
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99 | /**
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100 | */
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101 | void
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102 | tdbclass::closedatabase ()
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103 | {
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104 | if (tdb == NULL)
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105 | {
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106 | return;
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107 | }
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108 | tdb_close (tdb);
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109 | tdb = NULL;
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110 | openfile.clear();
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111 | }
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112 | /** closedatabase() **/
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113 |
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114 |
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115 | /**
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116 | */
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117 | void
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118 | tdbclass::deletekey (const text_t &key)
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119 | {
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120 | if (tdb == NULL)
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121 | {
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122 | return;
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123 | }
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124 | // get a utf-8 encoded c string of the unicode key
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125 | TDB_DATA key_data;
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126 | key_data.dptr = (unsigned char*)(to_utf8(key)).getcstr();
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127 | if (key_data.dptr == NULL)
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128 | {
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129 | return;
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130 | }
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131 | key_data.dsize = strlen((const char *)key_data.dptr);
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132 | // delete the key
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133 | tdb_delete(tdb, key_data);
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134 | // free up the key memory
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135 | delete []key_data.dptr;
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136 | }
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137 | /** deletekey() **/
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138 |
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139 | // returns file extension string
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140 | text_t
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141 | tdbclass::getfileextension ()
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142 | {
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143 | return ".tdb";
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144 | }
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145 | /** getfileextension() **/
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146 |
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147 | // returns true on success
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148 | bool
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149 | tdbclass::getkeydata (const text_t& key, text_t &data)
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150 | {
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151 | if (tdb == NULL)
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152 | {
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153 | return false;
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154 | }
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155 |
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156 | // get a utf-8 encoded c string of the unicode key
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157 | TDB_DATA key_data;
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158 | key_data.dptr = (unsigned char *)(to_utf8(key)).getcstr();
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159 | if (key_data.dptr == NULL)
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160 | {
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161 | if (logout != NULL)
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162 | {
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163 | (*logout) << "tdbclass: out of memory" << endl;
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164 | }
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165 | return false;
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166 | }
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167 | key_data.dsize = strlen((const char *)key_data.dptr);
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168 |
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169 | // fetch the result
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170 | TDB_DATA return_data = tdb_fetch(tdb, key_data);
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171 | delete []key_data.dptr;
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172 |
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173 | if (return_data.dptr == NULL)
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174 | {
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175 | return false;
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176 | }
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177 | data.setcarr((char *)return_data.dptr, return_data.dsize);
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178 | free(return_data.dptr);
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179 | data = to_uni(data); // convert to unicode
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180 |
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181 | return true;
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182 | }
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183 | /** getkeydata() **/
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184 |
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185 |
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186 | // returns array of keys
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187 | text_tarray
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188 | tdbclass::getkeys ()
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189 | {
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190 | text_tarray keys;
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191 |
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192 | text_t key = getfirstkey();
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193 | while (!key.empty())
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194 | {
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195 | keys.push_back(key);
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196 | key = getnextkey(key);
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197 | }
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198 |
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199 | return keys;
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200 | }
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201 | /** getkeys() **/
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202 |
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203 |
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204 | // returns true on success
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205 | bool
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206 | tdbclass::setkeydata (const text_t &key, const text_t &data)
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207 | {
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208 | if (tdb == NULL)
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209 | {
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210 | return false;
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211 | }
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212 |
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213 | // get a utf-8 encoded c string of the unicode key
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214 | TDB_DATA key_data;
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215 | key_data.dptr = (unsigned char *)(to_utf8(key)).getcstr();
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216 | if (key_data.dptr == NULL)
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217 | {
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218 | if (logout != NULL)
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219 | {
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220 | (*logout) << "tdbclass: out of memory" << endl;
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221 | }
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222 | return false;
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223 | }
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224 | key_data.dsize = strlen((const char *)key_data.dptr);
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225 |
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226 | TDB_DATA data_data;
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227 | data_data.dptr = (unsigned char *)(to_utf8(data)).getcstr();
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228 | if (data_data.dptr == NULL)
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229 | {
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230 | if (logout != NULL)
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231 | {
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232 | (*logout) << "tdbclass: out of memory" << endl;
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233 | }
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234 | delete []key_data.dptr;
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235 | return false;
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236 | }
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237 | data_data.dsize = strlen((const char *)data_data.dptr);
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238 |
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239 | int ret = tdb_store (tdb, key_data, data_data, TDB_DEFAULT);
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240 | delete []key_data.dptr;
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241 | delete []data_data.dptr;
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242 |
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243 | return (ret == 0);
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244 | }
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245 | /** setkeydata() **/
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246 |
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247 | // ----------------------------------------------------------------------------------------
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248 | // TDB-ONLY FUNCTIONS
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249 | // ----------------------------------------------------------------------------------------
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250 |
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251 | // getfirstkey and getnextkey are used for traversing the database
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252 | // no insertions or deletions should be carried out while traversing
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253 | // the database. when there are no keys left to visit in the database
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254 | // an empty string is returned.
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255 | text_t
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256 | tdbclass::getfirstkey ()
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257 | {
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258 | if (tdb == NULL)
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259 | {
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260 | return g_EmptyText;
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261 | }
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262 | // get the first key
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263 | TDB_DATA firstkey_data = tdb_firstkey(tdb);
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264 | if (firstkey_data.dptr == NULL)
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265 | {
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266 | return g_EmptyText;
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267 | }
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268 | // convert it to text_t
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269 | text_t firstkey;
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270 | firstkey.setcarr((char *)firstkey_data.dptr, firstkey_data.dsize);
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271 | free(firstkey_data.dptr);
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272 |
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273 | return to_uni(firstkey); // convert to unicode
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274 | }
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275 | /** getfirstkey() **/
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276 |
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277 | /**
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278 | */
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279 | text_t
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280 | tdbclass::getnextkey (const text_t &key)
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281 | {
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282 | if (tdb == NULL || key.empty())
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283 | {
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284 | return g_EmptyText;
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285 | }
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286 | // get a utf-8 encoded c string of the unicode key
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287 | TDB_DATA key_data;
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288 | key_data.dptr = (unsigned char *)(to_utf8(key)).getcstr();
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289 | if (key_data.dptr == NULL)
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290 | {
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291 | return g_EmptyText;
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292 | }
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293 | key_data.dsize = strlen((const char *)key_data.dptr);
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294 |
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295 | // get the next key
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296 | TDB_DATA nextkey_data = tdb_nextkey(tdb, key_data);
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297 | if (nextkey_data.dptr == NULL)
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298 | {
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299 | delete []key_data.dptr;
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300 | return g_EmptyText;
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301 | }
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302 |
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303 | // convert it to text_t
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304 | text_t nextkey;
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305 | nextkey.setcarr((char *)nextkey_data.dptr, nextkey_data.dsize);
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306 | free(nextkey_data.dptr);
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307 | delete []key_data.dptr;
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308 | return to_uni(nextkey); // convert to unicode
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309 | }
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310 | /** getnextkey() **/
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311 |
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