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#======================================================================= |
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# THIS IS A REUSED PERL MODULE, FOR PROPER LICENCING TERMS SEE BELOW: |
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# |
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# Copyright Martin Hosken |
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# |
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# No warranty or expression of effectiveness, least of all regarding |
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# anyone's safety, is implied in this software or documentation. |
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# |
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# This specific module is licensed under the Perl Artistic License. |
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# Effective 28 January 2021, the original author and copyright holder, |
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# Martin Hosken, has given permission to use and redistribute this module |
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# under the MIT license. |
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# |
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#======================================================================= |
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package PDF::Builder::Basic::PDF::Null; |
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use base 'PDF::Builder::Basic::PDF::Objind'; |
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use strict; |
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use warnings; |
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our $VERSION = '3.023'; # VERSION |
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our $LAST_UPDATE = '3.022'; # manually update whenever code is changed |
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=head1 NAME |
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PDF::Builder::Basic::PDF::Null - PDF Null type object. This is a subclass of |
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PDF::Builder::Basic::PDF::Objind and cannot be subclassed. |
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=head1 METHODS |
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=cut |
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# There is only one null object (section 3.2.8). |
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my $null_obj = bless {}, 'PDF::Builder::Basic::PDF::Null'; |
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=head2 PDF::Builder::Basic::PDF::Null->new() |
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Returns the null object. There is only one null object. |
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=cut |
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sub new { |
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return $null_obj; |
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} |
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=head2 $s->realise() |
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Pretends to finish reading the object. |
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=cut |
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sub realise { |
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return $null_obj; |
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} |
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=head2 $s->outobjdeep() |
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Output the object in PDF format. |
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=cut |
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sub outobjdeep { |
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my ($self, $fh, $pdf) = @_; |
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$fh->print('null'); |
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return; |
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} |
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=head2 $s->is_obj() |
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Returns false because null is not a full object. |
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=cut |
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sub is_obj { |
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return 0; |
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} |
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=head2 $s->copy() |
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Another no-op. |
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=cut |
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sub copy { |
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return $null_obj; |
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} |
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=head2 $s->val() |
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Return undef. |
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=cut |
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sub val { |
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return undef; ## no critic (undef is intentional) |
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} |
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1; |