1 | /**********************************************************************
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2 | *
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3 | * IsisDb.cpp
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4 | * Copyright (C) 2003 UNESCO
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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 | // ISISDB: Isis Master file methods
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28 | ////////////////////////////////////////////////////////////
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29 | #include "stdafx.h"
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30 | #include "IsisDb.h"
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31 | #include "XRFFile.h"
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32 |
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33 |
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34 |
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35 | //--------------------------------------------------------------------------------
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36 | // IsisDb::IsisDb()
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37 | //
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38 | // Constructor, Makes an ISIS Data Base object that isn't connected to a Master
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39 | // file, Cross Reference file and Fdt.
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40 | //-------------------------------------------------------------------------------
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41 | IsisDb::IsisDb()
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42 | {
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43 | bReadOnly_ = false;
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44 | try
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45 | {
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46 | mf_ = new MfFile;
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47 | xf_ = new XrfFile;
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48 | fdt_ = new CFdt;
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49 | }
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50 | catch(std::bad_alloc)
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51 | {
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52 | throw CIsisDbException(ISIS_BAD_ALLOC, __FILE__, __LINE__);
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53 | }
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54 | }
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55 |
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56 | //////////////////////////////
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57 |
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58 | IsisDb::~IsisDb( )
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59 | {
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60 | delete mf_; delete xf_; delete fdt_;
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61 | }
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62 |
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63 |
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64 | //////////////////////////////
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65 |
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66 | int IsisDb::CreateDb(const TCHAR *fname)
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67 | {
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68 | name = fname;
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69 | MkNames();
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70 | int rc = ISIS_NO_ERROR;
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71 |
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72 | // We should not try to create a mf_ which already exist!
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73 | if (CFileBase::Exists(mfname_))
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74 | {
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75 | throw CIsisDbException(ISIS_MF_ALREADY_EXIST_ERROR, __FILE__, __LINE__);
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76 | }
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77 | else
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78 | {
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79 | try
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80 | {
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81 | rc = mf_->CreateMf(mfname_, USERMST);
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82 | rc = xf_->CreateXrf(xrfname_);
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83 | rc = fdt_->Load(fdtname_);
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84 | }
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85 | catch(CIsisDbException)
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86 | {
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87 | throw CIsisDbException(ISIS_MF_OPEN_ERROR, __FILE__, __LINE__);
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88 | }
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89 | }
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90 |
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91 | return rc;
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92 | }
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93 |
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94 |
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95 | //////////////////////////////
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96 |
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97 | void IsisDb::CloseDb()
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98 | {
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99 | mf_->CloseMf();
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100 | xf_->Close();
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101 | }
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102 |
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103 | //////////////////////////////
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104 |
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105 | void IsisDb::MkNames()
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106 | // Make file names
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107 | {
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108 | const _TCHAR *s = name.c_str();
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109 | _TCHAR *ps = new _TCHAR[_tcslen(s)+1];
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110 | _tcscpy(ps, s);
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111 | _TCHAR * tmp = _tcsrchr(ps, _T('.'));
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112 | assert(tmp != NULL);
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113 | // Terminate the string at the last dot
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114 | *tmp = _T('\0');
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115 |
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116 | _tcscpy(mfname_,ps);
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117 | _tcscat(mfname_,_T(".mst"));
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118 | _tcscpy(xrfname_,ps);
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119 | _tcscat(xrfname_,_T(".xrf"));
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120 | _tcscpy(fdtname_,ps);
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121 | _tcscat(fdtname_,_T(".fdt"));
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122 | _tcscpy(idxname_,ps);
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123 | _tcscat(idxname_,_T(".idx"));
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124 | delete[] ps;
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125 | }
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126 |
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127 | //////////////////////////////
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128 |
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129 | int IsisDb::OpenDb(const TCHAR *fname, FileSystem::AccessMode mode
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130 | /* = FileSystem::FILE_READWRITE */)
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131 | {
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132 | name = fname;
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133 | MkNames();
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134 | int rc;
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135 | try
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136 | {
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137 | // if (FileSystem::IsReadOnly(mfname_))
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138 | // mode = FileSystem::FILE_READONLY;
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139 | rc = mf_->OpenMf(mfname_, mode);
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140 | rc = xf_->OpenXrf(xrfname_, mode);
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141 | rc = fdt_->Load(fdtname_);
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142 | }
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143 | catch(CIsisDbException)
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144 | {
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145 | throw CIsisDbException(ISIS_MF_OPEN_ERROR, __FILE__, __LINE__);
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146 | }
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147 |
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148 | return rc;
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149 | }
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150 |
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151 | //----------------------------------------------------------------------------------
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152 | // int IsisDb::ReadDbRecord(long mfn, MfRecord &m)
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153 | //
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154 | // This function reads Master File record with MFN "mfn" into m
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155 | //
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156 | // Returns the status of the record:
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157 | // Active=0, LogicalyDeleted=1, PhysicalyDeleted=2, EndOfFile=-1, NewRecord = 3
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158 | //----------------------------------------------------------------------------------
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159 | int IsisDb::ReadDbRecord(long mfn, MfRecord &m)
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160 | {
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161 | long mfb;
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162 | int mfp;
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163 | int status;
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164 | bool rc;
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165 |
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166 | try
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167 | {
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168 | status = xf_->GetMfp(mfn, mfb, mfp);
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169 | if (status == Active || status == LogicalyDeleted)
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170 | if (!mf_->ReadMfRecord(mfb, mfp, m))
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171 | status = -1; // Error in reading the record!
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172 | }
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173 | catch(CIsisDbException)
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174 | {
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175 | throw CIsisDbException(ISIS_MF_OPEN_ERROR, __FILE__, __LINE__);
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176 | }
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177 | return status;
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178 | }
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179 |
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180 | //--------------------------------------------------------------------------------
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181 | // void CreateDbRecord(MfRecord &m)
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182 | //
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183 | // Create a new record at the end of the master file. The Master file address is
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184 | // set into the pair mfb/mfp and the XRF file is updated.
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185 | //---------------------------------------------------------------------------------
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186 | void IsisDb::CreateDbRecord(MfRecord &m)
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187 | {
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188 |
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189 | }
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190 |
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191 | //--------------------------------------------------------------------------------
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192 | // void CreateDbRecordWithMfn(MfRecord &m)
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193 | //
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194 | // Create a new record at the end of the master file. The Master file address is
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195 | // set into the pair mfb/mfp and the XRF file is updated.
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196 | //---------------------------------------------------------------------------------
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197 | void IsisDb::CreateDbRecordWithMfn(MfRecord &m)
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198 | {
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199 |
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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 | // void UpdateDbRecord(MfRecord &m)
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205 | //
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206 | // Update of existing records. Whenever a record is updated, the system writes
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207 | // the record back to the master file. Where it is written depends on the status
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208 | // of the record when it was initially read.
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209 | //
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210 | //----------------------------------------------------------------------------------
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211 | void IsisDb::UpdateDbRecord(MfRecord &m)
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212 | {
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213 | }
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214 | //----------------------------------------------------------------------------------
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215 | // int IsisDb::DeleteRecord(long mfn)
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216 | //
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217 | // This function logically deletes a Master File record with MFN "mfn".
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218 | // On XRF, xrfmfb is negative and on MST, status is set to 1
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219 | //
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220 | // Returns true if successful
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221 | //----------------------------------------------------------------------------------
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222 | bool IsisDb::DeleteRecord(long mfn)
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223 | {
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224 |
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225 | return false;
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226 | }
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227 |
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228 | long IsisDb::GetNextActiveMfn(long mfn /* = -1 */)
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229 | {
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230 | if (mfn == -1)
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231 | mfn = 1;
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232 | else
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233 | mfn++;
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234 | long mfb;
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235 | int mfp;
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236 | int iRet = xf_->GetMfp(mfn, mfb, mfp);
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237 | while (iRet != Active && iRet != EndOfFile)
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238 | {
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239 | mfn++;
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240 | iRet = xf_->GetMfp(mfn, mfb, mfp);
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241 | }
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242 | if (iRet == EndOfFile)
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243 | return 0;
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244 | else
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245 | return mfn;
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246 | }
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247 |
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248 | _TCHAR *IsisDb::GetIdxFileName()
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249 | {
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250 | return idxname_;
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251 | }
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252 |
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