1 | ###########################################################################
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2 | #
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3 | # arcinfo.pm --
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 1999 New Zealand Digital Library Project
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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 | # This module stores information about the archives. At the moment
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28 | # this information just consists of the file name (relative to the
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29 | # directory the archives information file is in) and its OID.
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30 |
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31 | # This module assumes there is a one to one correspondance between
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32 | # a file in the archives directory and an OID.
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33 |
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34 |
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35 | package arcinfo;
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36 |
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37 | use constant ORDER_OID_INDEX => 0;
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38 | use constant ORDER_SORT_INDEX => 1;
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39 |
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40 | use constant INFO_FILE_INDEX => 0;
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41 | use constant INFO_STATUS_INDEX => 1;
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42 |
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43 | # File format read in: OID <tab> Filename <tab> Optional-Index-Status
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44 |
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45 | # Index status can be:
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46 | # I = Index for the first time
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47 | # R = Reindex
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48 | # D = Delete
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49 | # B = Been indexed
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50 |
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51 | sub new {
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52 | my ($class) = @_;
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53 | my $self = {'info'=>{},
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54 | 'order'=>[]};
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55 |
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56 | return bless $self, $class;
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57 | }
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58 |
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59 | sub load_info {
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60 | my $self = shift (@_);
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61 | my ($filename) = @_;
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62 |
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63 | $self->{'info'} = {};
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64 |
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65 | if (defined $filename && -e $filename) {
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66 | open (INFILE, $filename) ||
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67 | die "arcinfo::load_info couldn't read $filename\n";
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68 |
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69 | my ($line, @line);
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70 | while (defined ($line = <INFILE>)) {
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71 | $line =~ s/\cM|\cJ//g; # remove end-of-line characters
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72 | @line = split ("\t", $line); # filename,
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73 | if (scalar(@line) >= 2) {
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74 | $self->add_info (@line);
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75 | }
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76 | }
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77 | close (INFILE);
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78 | }
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79 | }
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80 |
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81 | sub save_info {
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82 | my $self = shift (@_);
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83 | my ($filename) = @_;
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84 |
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85 | my ($OID, $info);
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86 |
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87 | open (OUTFILE, ">$filename") ||
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88 | die "arcinfo::save_info couldn't write $filename\n";
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89 |
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90 | foreach $info (@{$self->get_OID_list()}) {
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91 | if (defined $info) {
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92 | print OUTFILE join("\t", @$info), "\n";
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93 | }
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94 | }
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95 | close (OUTFILE);
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96 | }
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97 |
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98 | sub delete_info {
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99 | my $self = shift (@_);
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100 | my ($OID) = @_;
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101 |
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102 | if (defined $self->{'info'}->{$OID}) {
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103 | delete $self->{'info'}->{$OID};
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104 |
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105 | my $i = 0;
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106 | while ($i < scalar (@{$self->{'order'}})) {
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107 | if ($self->{'order'}->[$i]->[ORDER_OID_INDEX] eq $OID) {
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108 | splice (@{$self->{'order'}}, $i, 1);
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109 | last;
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110 | }
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111 |
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112 | $i ++;
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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 | sub add_info {
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118 | my $self = shift (@_);
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119 | my ($OID, $doc_file, $index_status, $sortmeta) = @_;
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120 | $sortmeta = "" unless defined $sortmeta;
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121 | $index_status = "I" unless defined $index_status; # I = needs indexing
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122 |
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123 | if (! defined($OID)) {
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124 | # only happens when no files can be processed?
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125 | return undef;
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126 | }
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127 |
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128 | $self->delete_info ($OID);
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129 | $self->{'info'}->{$OID} = [$doc_file,$index_status];
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130 | push (@{$self->{'order'}}, [$OID, $sortmeta]);
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131 | }
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132 |
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133 | sub set_status_info {
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134 | my $self = shift (@_);
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135 | my ($OID, $index_status) = @_;
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136 |
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137 | my $OID_info = $self->{'info'}->{$OID};
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138 | $OID_info->[INFO_STATUS_INDEX] = $index_status;
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139 | }
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140 |
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141 |
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142 | sub get_status_info {
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143 | my $self = shift (@_);
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144 | my ($OID) = @_;
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145 |
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146 | my $index_status = undef;
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147 |
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148 | my $OID_info = $self->{'info'}->{$OID};
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149 | if (defined $OID_info) {
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150 | $index_status = $OID_info->[INFO_STATUS_INDEX];
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151 | }
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152 | else {
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153 | die "Unable to find document id $OID\n";
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154 | }
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155 |
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156 | return $index_status;
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157 |
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158 | }
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159 |
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160 |
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161 | # returns a list of the form [[OID, doc_file, index_status], ...]
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162 | sub get_OID_list
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163 | {
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164 | my $self = shift (@_);
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165 |
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166 | my $order = $self->{'order'};
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167 |
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168 | my @sorted_order
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169 | = sort {$a->[ORDER_SORT_INDEX] cmp $b->[ORDER_SORT_INDEX]} @$order;
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170 |
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171 | my @list = ();
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172 |
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173 | foreach my $OID_order (@sorted_order) {
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174 | my $OID = $OID_order->[ORDER_OID_INDEX];
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175 | my $OID_info = $self->{'info'}->{$OID};
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176 |
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177 | push (@list, [$OID, $OID_info->[INFO_FILE_INDEX],
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178 | $OID_info->[INFO_STATUS_INDEX]]);
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179 | }
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180 |
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181 | return \@list;
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182 | }
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183 |
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184 | # returns a list of the form [[doc_file, OID], ...]
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185 | sub get_file_list {
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186 | my $self = shift (@_);
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187 |
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188 | my $order = $self->{'order'};
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189 |
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190 | my @sorted_order
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191 | = sort {$a->[ORDER_SORT_INDEX] cmp $b->[ORDER_SORT_INDEX]} @$order;
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192 |
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193 | my @list = ();
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194 |
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195 | foreach $OID_order (@sorted_order) {
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196 | my $OID = $OID_order->[ORDER_OID_INDEX];
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197 | my $OID_info = $self->{'info'}->{$OID};
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198 |
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199 | push (@list, [$OID_info->[INFO_FILE_INDEX], $OID]);
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200 | }
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201 |
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202 | return \@list;
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203 | }
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204 |
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205 |
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206 | # returns a list of the form [doc_file]
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207 | sub get_info {
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208 | my $self = shift (@_);
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209 | my ($OID) = @_;
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210 |
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211 | if (defined $self->{'info'}->{$OID}) {
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212 | return $self->{'info'}->{$OID};
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213 | }
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214 |
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215 | return undef;
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216 | }
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217 |
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218 |
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219 | # returns the number of documents so far
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220 | sub size {
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221 | my $self = shift (@_);
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222 | return (scalar(@{$self->{'order'}}));
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223 | }
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224 |
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225 | 1;
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226 |
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