1 | package GDBMUtils;
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2 |
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3 | use strict;
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4 | use util;
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5 |
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6 | my $debug = 0;
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7 |
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8 | # /** Global variables to hold a strings containing:
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9 | # * the last collection, oid and value
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10 | # * a gdbmCachedCollectionGet() was performed on.
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11 | # */
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12 | my $gdbmget_previous_collection = "";
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13 | my $gdbmget_previous_oid = "";
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14 | my $gdbmget_previous_value = "";
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15 |
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16 |
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17 |
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18 | sub gdbmDatabaseGet
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19 | {
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20 | my ($database, $oid) = @_;
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21 |
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22 | # Are we in windows? Do we need .exe?
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23 | my $exe = &util::get_os_exe();
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24 |
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25 | # Retrieve the raw document content
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26 | print STDERR "#Get document\ncmd: gdbmget$exe \"$database\" \"$oid\"\n" if $debug;
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27 | my $value = `gdbmget$exe "$database" "$oid"`;
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28 |
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29 | # Done
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30 | return $value;
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31 | }
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32 |
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33 | sub parseStringToHash
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34 | {
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35 | my ($val) = @_;
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36 |
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37 | my $rec = {};
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38 |
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39 | while ($val =~ m/^<(.*?)>(.*)$/mg) {
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40 | my $metaname = $1;
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41 | my $metavalue = $2;
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42 |
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43 | if (!defined $rec->{$metaname}) {
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44 | $rec->{$metaname} = [ $metavalue ];
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45 | }
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46 | else {
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47 | push(@{$rec->{$metaname}},$metavalue);
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48 | }
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49 | }
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50 |
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51 | return $rec;
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52 | }
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53 |
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54 | sub gdbmRecordToHash
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55 | {
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56 | my ($database, $oid) = @_;
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57 |
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58 | my $val = gdbmDatabaseGet($database,$oid);
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59 |
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60 | return parseStringToHash($val);
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61 | }
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62 |
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63 | sub serializeHash
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64 | {
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65 | my ($hash) = @_;
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66 |
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67 | my $shash = "";
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68 |
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69 | foreach my $metaname (keys %$hash) {
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70 | my $metavals = $hash->{$metaname};
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71 | foreach my $metaval (@$metavals) {
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72 | # need to escape chars HTML entities ??
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73 | $shash .= "<$metaname>$metaval\n";
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74 | }
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75 | }
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76 |
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77 | return $shash;
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78 | }
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79 |
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80 |
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81 | sub gdbmDatabaseAppend
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82 | {
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83 | my ($database, $oid, $value) = @_;
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84 |
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85 | # Are we in windows? Do we need .exe?
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86 | my $exe = &util::get_os_exe();
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87 |
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88 | # Escape any speech marks in the value
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89 | $value =~ s/\"/\\\"/g;
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90 | # Set the document content
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91 | print STDERR "#Set document\ncmd: gdbmset$exe \"$database\" \"$oid\" \"$value\" append\n" if $debug;
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92 | `gdbmset$exe "$database" "$oid" "$value" append`;
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93 | }
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94 |
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95 |
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96 | sub gdbmDatabaseSet
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97 | {
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98 | my ($database, $oid, $value) = @_;
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99 |
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100 | # Are we in windows? Do we need .exe?
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101 | my $exe = &util::get_os_exe();
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102 |
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103 | # Escape any speech marks in the value
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104 | $value =~ s/\"/\\\"/g;
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105 | # Set the document content
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106 | print STDERR "#Set document\ncmd: gdbmset$exe \"$database\" \"$oid\" \"$value\"\n" if $debug;
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107 | `gdbmset$exe "$database" "$oid" "$value"`;
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108 | }
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109 |
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110 |
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111 | sub gdbmDatabaseRemove
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112 | {
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113 | my ($database, $oid) = @_;
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114 |
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115 | # Are we in windows? Do we need .exe?
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116 | my $exe = &util::get_os_exe();
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117 |
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118 | # Remove the document from the database
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119 |
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120 | my $cmd = "gdbmdel$exe \"$database\" \"$oid\"";
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121 | print STDERR "#Delete document\ncmd: $cmd\n" if $debug;
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122 |
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123 | `$cmd`;
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124 |
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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 | # /** This wraps John T's gdbmget executable to get the gdbm database entry for
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130 | # * a particular OID.
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131 | # *
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132 | # * @param $collection is the collection name.
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133 | # * @param $oid is the internal document id.
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134 | # *
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135 | # *
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136 | # * @author John Rowe, DL Consulting Ltd.
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137 | # * @author John Thompson, DL Consulting Ltd.
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138 | # */
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139 | sub gdbmCachedCollectionGet
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140 | {
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141 | my ($collection, $oid) = @_;
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142 | # Start by checking if this request is the same as the previous one, and if
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143 | # so return the cache version instead. This is an optimization to improve
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144 | # performance when checking if a certain GDBM document exists before
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145 | # creating a new node object
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146 | if($collection eq $gdbmget_previous_collection
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147 | && $oid eq $gdbmget_previous_oid)
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148 | {
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149 | print STDERR "#Get document - using cached value\n" if $debug;
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150 | return $gdbmget_previous_value;
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151 | }
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152 |
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153 | # Where's the database?
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154 | my $database = _getDatabasePath($collection);
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155 |
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156 | my $value = gdbmDatabaseGet($database,$oid);
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157 |
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158 | # Tidy up the ever growing number of newlines at the end of the value
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159 | $value =~ s/(\r?\n)+/$1/g;
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160 | # Why do we need the above line? At the very least it would seem
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161 | # better that the data going in to the database through 'set' is
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162 | # monitored for superfluous \r\n which are then removed before being
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163 | # saved in GDBM
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164 |
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165 | # Cache this result
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166 | $gdbmget_previous_collection = $collection;
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167 | $gdbmget_previous_oid = $oid;
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168 | $gdbmget_previous_value = $value;
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169 |
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170 | # Done
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171 | return $value;
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172 | }
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173 | # /** gdbmCachedCollectionGet **/
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174 |
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175 | # /** This wraps John T's gdbmset executable to set the gdbm database entry for
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176 | # * a particular OID. This does not yet report errors.
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177 | # *
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178 | # * @param $collection is the collection name.
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179 | # * @param $oid is the internal document id.
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180 | # * @param $value is the new value to set for the oid.
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181 | # *
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182 | # * @author John Rowe, DL Consulting Ltd.
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183 | # */
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184 | sub gdbmCachedCollectionSet
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185 | {
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186 | my ($collection, $oid, $value) = @_;
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187 |
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188 | # Where's the database?
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189 | my $database = _getDatabasePath($collection);
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190 |
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191 |
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192 | # Check whether value is set
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193 | if (defined($value))
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194 | {
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195 | gdbmDatabaseSet($database,$oid,$value);
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196 | }
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197 | else
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198 | {
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199 | gdbmDatabaseRemove($database,$oid);
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200 | }
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201 |
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202 | # Empty any cached values, as they may now be invalid
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203 |
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204 | # Cache this result
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205 | $gdbmget_previous_collection = "";
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206 | $gdbmget_previous_oid = "";
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207 | $gdbmget_previous_value = 0;
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208 | }
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209 | # /** gdbmCollectionSet **/
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210 |
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211 | # /** This works out the database path and returns it to the calling
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212 | # * calling function.
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213 | # *
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214 | # * @param $collection The current collection name
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215 | # *
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216 | # * @author John Rowe, DL Consulting Ltd.
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217 | # */
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218 |
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219 | sub _getDatabasePath
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220 | {
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221 | my $collection = shift(@_);
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222 |
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223 | # Return the full filename of the database
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224 |
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225 | return &util::filename_cat($ENV{'GSDLHOME'}, "collect", $collection, "index", "text", "$collection.gdb");
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226 | }
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227 | # /** getDatabasePath **/
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228 |
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229 | 1;
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