1 | package AutoLoadConverters;
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2 |
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3 | use strict;
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4 | no strict 'refs';
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5 | no strict 'subs';
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6 |
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7 | use PrintInfo;
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8 |
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9 | use gsprintf 'gsprintf';
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10 |
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11 | sub BEGIN {
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12 | @AutoLoadConverters::ISA = ('PrintInfo');
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13 | }
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14 |
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15 | # the dynamic conversion args will get added here
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16 | my $arguments = [];
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17 |
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18 | my $options = { 'name' => "AutoLoadConverters",
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19 | 'desc' => "{AutoLoadConverters.desc}",
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20 | 'abstract' => "yes",
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21 | 'inherits' => "yes",
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22 | 'args' => $arguments };
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23 |
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24 | sub dynamically_load_converter
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25 | {
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26 | my ($autoPackage, $calling_class) = @_;
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27 |
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28 | my $settings = {};
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29 |
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30 | my ($autoName) = ($autoPackage =~ m/(^.*)Converter$/);
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31 | my $autoVar = lc($autoName);
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32 | $settings->{'converter_name'} = $autoName;
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33 | $settings->{'converter_var'} = $autoVar;
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34 |
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35 | eval("require $autoPackage");
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36 | if ($@) {
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37 | # Useful debugging statement if there is a syntax error in the plugin
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38 | #print STDERR "$@\n";
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39 | $settings->{'converter_installed'} = 0;
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40 | $settings->{'conversion_available'} = 0;
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41 | }
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42 | else {
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43 | # found the converter
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44 | $settings->{'conversion_installed'} = 1;
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45 | print STDERR "AutoLoadConverters: $autoName Extension to Greenstone detected for $calling_class\n";
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46 | # but can it run???
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47 | if (eval "\$${autoPackage}::${autoVar}_conversion_available") {
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48 | $settings->{'conversion_available'} = 1;
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49 | push(@AutoLoadConverters::ISA, $autoPackage);
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50 |
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51 | } else {
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52 | $settings->{'conversion_available'} = 0;
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53 | print STDERR "... but it appears to be broken\n";
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54 | &gsprintf(STDERR, "AutoLoadConverters: {AutoloadConverter.noconversionavailable}");
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55 | my $dictentry_reason
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56 | = eval "$autoPackage\.\$${autoPackage}::no_${autoVar}_conversion_reason";
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57 |
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58 | &gsprintf(STDERR, " ({$dictentry_reason})\n");
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59 |
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60 | }
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61 | }
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62 |
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63 | if ($settings->{'conversion_available'}) {
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64 |
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65 | my $opt_conversion_args =
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66 | [ { 'name' => "$autoVar\_conversion",
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67 | 'desc' => "{$autoPackage.$autoVar\_conversion}",
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68 | 'type' => "flag",
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69 | 'reqd' => "no" } ];
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70 |
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71 | $settings->{'converter_arguments'} = $opt_conversion_args;
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72 |
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73 | }
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74 | return $settings;
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75 |
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76 |
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77 | }
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78 |
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79 | ####
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80 | # This plugin takes an extra initial parameter in its constructor (compared
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81 | # with the norm). The extra parameter is an array of converters
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82 | # it should try to dynamically load
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83 | #####
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84 |
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85 | sub new {
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86 |
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87 | # Start the AutoExtractMetadata Constructor
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88 | my $class = shift (@_);
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89 | my ($pluginlist,$inputargs,$hashArgOptLists,$autoPackages, $auxiliary) = @_;
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90 |
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91 | push(@$pluginlist, $class);
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92 | my $classPluginName = $pluginlist->[0];
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93 |
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94 | push(@{$hashArgOptLists->{"OptList"}},$options);
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95 |
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96 | # this static list is just for pluginfo on AutoLoadConverters - we will try to explicitly load all packages
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97 | $autoPackages = ["OpenOfficeConverter", "PDFBoxConverter"] unless defined $autoPackages;
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98 |
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99 | my @self_array = ();
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100 | my $temporary_self = {};
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101 | $temporary_self->{'converter_list'} = [];
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102 | push (@self_array, $temporary_self);
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103 | foreach my $packageName (@$autoPackages) {
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104 | my $package_settings = &dynamically_load_converter($packageName, $classPluginName);
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105 | my $available_var = $package_settings->{'converter_var'}."_available";
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106 | if ($package_settings->{'conversion_available'}) {
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107 | push(@$arguments, @{$package_settings->{'converter_arguments'}});
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108 | my $package_self = eval "new $packageName(\$pluginlist, \$inputargs, \$hashArgOptLists,1);";
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109 | push (@self_array, $package_self);
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110 | $temporary_self->{$available_var} = 1;
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111 | push(@{$temporary_self->{'converter_list'}}, $packageName);
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112 | } else {
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113 | $temporary_self->{$available_var} = 0;
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114 | }
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115 | }
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116 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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117 | my $self;
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118 | my $pi_self = new PrintInfo($pluginlist, $inputargs, $hashArgOptLists, 1);
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119 | push (@self_array, $pi_self);
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120 | $self = BasePlugin::merge_inheritance(@self_array);
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121 |
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122 | return bless $self, $class;
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123 | }
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124 |
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125 | sub init {
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126 | my $self = shift (@_);
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127 |
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128 | foreach my $converter (@{$self->{'converter_list'}}) {
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129 | eval "\$self->${converter}::init(\@_);";
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130 | }
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131 |
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132 | }
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133 |
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134 | sub begin {
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135 | my $self = shift (@_);
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136 |
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137 | foreach my $converter(@{$self->{'converter_list'}}) {
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138 | eval "\$self->${converter}::begin(\@_);";
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139 | }
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140 | }
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141 |
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142 | sub deinit {
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143 | my $self = shift (@_);
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144 |
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145 | foreach my $converter (@{$self->{'converter_list'}}) {
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146 | eval "\$self->${converter}::deinit(\@_);";
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147 | }
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148 |
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149 | }
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150 |
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151 | sub tmp_area_convert_file {
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152 | my $self = shift (@_);
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153 | my ($output_ext, $input_filename, $textref) = @_;
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154 |
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155 | foreach my $converter(@{$self->{'converter_list'}}) {
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156 | my ($var) = ($converter =~ m/(^.*)Converter$/);
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157 | $var = lc($var);
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158 | if ($self->{"${var}_conversion"}) {
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159 | my ($result, $result_str, $new_filename)
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160 | = eval "\$self->${converter}::convert(\$input_filename, \$output_ext);";
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161 | if ($result != 0) {
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162 | return $new_filename;
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163 | }
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164 | my $outhandle=$self->{'outhandle'};
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165 | print $outhandle "$converter Conversion error\n";
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166 | print $outhandle $result_str;
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167 | return "";
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168 | }
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169 | }
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170 |
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171 | # if got here, no converter was specified in plugin args
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172 | return $self->ConvertBinaryFile::tmp_area_convert_file(@_);
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173 |
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174 | }
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