1 | ###########################################################################
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2 | #
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3 | # plugout.pm -- functions to handle using plugouts
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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 | package plugout;
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27 |
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28 | use strict; # to pick up typos and undeclared variables...
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29 | no strict 'refs'; # ...but allow filehandles to be variables and vice versa
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30 | no strict 'subs';
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31 |
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32 | require util;
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33 | use gsprintf 'gsprintf';
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34 |
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35 | # global variables
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36 | my $stats = {'num_processed' => 0,
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37 | 'num_blocked' => 0,
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38 | 'num_not_processed' => 0,
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39 | 'num_not_recognised' => 0,
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40 | 'num_archives' => 0
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41 | };
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42 |
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43 | #globaloptions contains any options that should be passed to all plugouts
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44 | my ($verbosity, $outhandle, $failhandle, $globaloptions);
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45 |
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46 | sub load_plugout{
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47 | my ($plugout) = shift @_;
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48 | my $plugout_name = shift @$plugout;
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49 | my $plugout_suffix = &util::filename_cat('perllib', 'plugouts', $plugout_name . '.pm');
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50 | my $plugout_found = 0;
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51 |
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52 | # To find the plugout we check a number of possible locations
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53 | # - any plugout found in the collection itself is our first choice, with
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54 | # those located in 'custom' having precedence
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55 | if (defined($ENV{'GSDLCOLLECTION'}))
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56 | {
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57 | my $collect_dir = $ENV{'GSDLCOLLECTION'};
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58 |
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59 | # (needed for Veridian?)
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60 | my $custom_plugout = &util::filename_cat($collect_dir, "custom", $collect_dir, $plugout_suffix);
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61 | if (&util::file_exists($custom_plugout))
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62 | {
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63 | require $custom_plugout;
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64 | $plugout_found = 1;
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65 | }
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66 | else
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67 | {
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68 | # typical collection override
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69 | my $collection_plugout = &util::filename_cat($collect_dir, $plugout_suffix);
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70 | if (&util::file_exists($collection_plugout))
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71 | {
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72 | require $custom_plugout;
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73 | $plugout_found = 1;
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74 | }
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75 | }
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76 | }
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77 | # - we then search for overridden version provided by any registered GS3
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78 | # extensions (check in order of extension definition)
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79 | if (!$plugout_found && defined $ENV{'GSDL3EXTS'})
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80 | {
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81 | my $ext_prefix = &util::filename_cat($ENV{'GSDL3SRCHOME'}, "ext");
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82 | my @extensions = split(/:/,$ENV{'GSDL3EXTS'});
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83 | foreach my $e (@extensions)
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84 | {
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85 | my $extension_plugout = &util::filename_cat($ext_prefix, $e, $plugout_suffix);
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86 | if (&util::file_exists($extension_plugout))
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87 | {
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88 | require $extension_plugout;
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89 | $plugout_found = 1;
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90 | }
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91 | }
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92 | }
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93 | # - similar for GS2 extensions
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94 | if (!$plugout_found && defined $ENV{'GSDLEXTS'})
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95 | {
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96 | my $ext_prefix = &util::filename_cat($ENV{'GSDLHOME'}, "ext");
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97 | my @extensions = split(/:/,$ENV{'GSDLEXTS'});
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98 | foreach my $e (@extensions)
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99 | {
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100 | my $extension_plugout = &util::filename_cat($ext_prefix, $e, $plugout_suffix);
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101 | if (&util::file_exists($extension_plugout))
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102 | {
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103 | require $extension_plugout;
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104 | $plugout_found = 1;
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105 | }
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106 | }
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107 | }
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108 | # - and the default is the main Greenstone version of the plugout
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109 | if (!$plugout_found)
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110 | {
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111 | my $main_plugout = &util::filename_cat($ENV{'GSDLHOME'}, $plugout_suffix);
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112 | if (&util::file_exists($main_plugout))
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113 | {
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114 | require $main_plugout;
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115 | $plugout_found = 1;
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116 | }
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117 | }
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118 |
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119 | # - no plugout found with this name
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120 | if (!$plugout_found)
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121 | {
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122 | gsprintf($outhandle, "{plugout.could_not_find_plugout}\n", $plugout_name);
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123 | die "\n";
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124 | }
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125 |
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126 | # - create a plugout object
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127 | my ($plugobj);
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128 |
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129 | eval ("\$plugobj = new \$plugout_name([],\$plugout)");
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130 | die "$@" if $@;
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131 |
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132 | return $plugobj;
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133 | }
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134 |
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135 | 1;
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