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Leader.pm
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Leader.pm
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package MARC::Leader;
use strict;
use warnings;
use Class::Utils qw(set_params);
use Data::MARC::Leader;
use Error::Pure qw(err);
use Scalar::Util qw(blessed);
our $VERSION = 0.05;
# Constructor.
sub new {
my ($class, @params) = @_;
# Create object.
my $self = bless {}, $class;
# Process parameters.
set_params($self, @params);
return $self;
}
sub parse {
my ($self, $leader) = @_;
my %params = (
'length' => $self->_int($leader, 0, 5),,
'status' => (substr $leader, 5, 1),
'type' => (substr $leader, 6, 1),
'bibliographic_level' => (substr $leader, 7, 1),
'type_of_control' => (substr $leader, 8, 1),
'char_coding_scheme' => (substr $leader, 9, 1),
'indicator_count' => (substr $leader, 10, 1),
'subfield_code_count' => (substr $leader, 11, 1),
'data_base_addr' => $self->_int($leader, 12, 5),
'encoding_level' => (substr $leader, 17, 1),
'descriptive_cataloging_form' => (substr $leader, 18, 1),
'multipart_resource_record_level' => (substr $leader, 19, 1),
'length_of_field_portion_len' => (substr $leader, 20, 1),
'starting_char_pos_portion_len' => (substr $leader, 21, 1),
'impl_def_portion_len' => (substr $leader, 22, 1),
'undefined' => (substr $leader, 23, 1),
);
return Data::MARC::Leader->new(%params);
}
sub serialize {
my ($self, $leader_obj) = @_;
# Check object.
if (! blessed($leader_obj) || ! $leader_obj->isa('Data::MARC::Leader')) {
err "Bad 'Data::MARC::Leader' instance to serialize.";
}
my $leader = sprintf('%05d', $leader_obj->length).
$leader_obj->status.
$leader_obj->type.
$leader_obj->bibliographic_level.
$leader_obj->type_of_control.
$leader_obj->char_coding_scheme.
$leader_obj->indicator_count.
$leader_obj->subfield_code_count.
sprintf('%05d', $leader_obj->data_base_addr).
$leader_obj->encoding_level.
$leader_obj->descriptive_cataloging_form.
$leader_obj->multipart_resource_record_level.
$leader_obj->length_of_field_portion_len.
$leader_obj->starting_char_pos_portion_len.
$leader_obj->impl_def_portion_len.
$leader_obj->undefined;
return $leader;
}
sub _int {
my ($self, $leader, $pos, $length) = @_;
my $ret = substr $leader, $pos, $length;
if ($ret =~ m/^\s+$/ms) {
$ret = 0;
} else {
$ret = int($ret);
}
}
1;
__END__
=pod
=encoding utf8
=head1 NAME
MARC::Leader - MARC leader class.
=head1 SYNOPSIS
use MARC::Leader;
my $obj = MARC::Leader->new(%params);
my $leader_obj = $obj->parse($leader_str);
my $leader_str = $obj->serialize($leader_obj);
=head1 METHODS
=head2 C<new>
my $obj = MARC::Leader->new(%params);
Constructor.
Returns instance of object.
=head2 C<parse>
my $leader_obj = $obj->parse($leader_str);
Parse MARC leader string to object.
Returns instance of 'Data::MARC::Leader' object.
=head2 C<serialize>
my $leader_str = $obj->serialize($leader_obj);
Serialize MARC leader object to string.
Returns string.
=head1 ERRORS
new():
From Class::Utils::set_params():
Unknown parameter '%s'.
serialize():
Bad 'Data::MARC::Leader' instance to serialize.
=head1 EXAMPLE1
=for comment filename=parse_marc_leader_and_dump.pl
use strict;
use warnings;
use Data::Printer;
use MARC::Leader;
if (@ARGV < 1) {
print "Usage: $0 marc_leader\n";
exit 1;
}
my $marc_leader = $ARGV[0];
# Object.
my $obj = MARC::Leader->new;
# Parse.
my $leader_obj = $obj->parse($marc_leader);
# Dump to output.
p $leader_obj;
# Output for '02200cem a2200541 i 4500':
# Data::MARC::Leader {
# parents: Mo::Object
# public methods (3):
# BUILD
# Mo::utils:
# check_strings
# Readonly:
# Readonly
# private methods (0)
# internals: {
# bibliographic_level "m",
# char_coding_scheme "a",
# data_base_addr 541,
# descriptive_cataloging_form "i",
# encoding_level " ",
# impl_def_portion_len 0,
# indicator_count 2,
# length 2200,
# length_of_field_portion_len 4,
# multipart_resource_record_level " ",
# starting_char_pos_portion_len 5,
# status "c",
# subfield_code_count 2,
# type "e",
# type_of_control " ",
# undefined 0
# }
# }
=head1 EXAMPLE2
=for comment filename=parse_marc_leader_and_print.pl
use strict;
use warnings;
use MARC::Leader;
use MARC::Leader::Print;
if (@ARGV < 1) {
print "Usage: $0 marc_leader\n";
exit 1;
}
my $marc_leader = $ARGV[0];
# Object.
my $obj = MARC::Leader->new;
# Parse.
my $leader_obj = $obj->parse($marc_leader);
# Print to output.
print scalar MARC::Leader::Print->new->print($leader_obj), "\n";
# Output for '02200cem a2200541 i 4500':
# Record length: 2200
# Record status: Corrected or revised
# Type of record: Cartographic material
# Bibliographic level: Monograph/Item
# Type of control: No specified type
# Character coding scheme: UCS/Unicode
# Indicator count: Number of character positions used for indicators
# Subfield code count: Number of character positions used for a subfield code (2)
# Base address of data: 541
# Encoding level: Full level
# Descriptive cataloging form: ISBD punctuation included
# Multipart resource record level: Not specified or not applicable
# Length of the length-of-field portion: Number of characters in the length-of-field portion of a Directory entry (4)
# Length of the starting-character-position portion: Number of characters in the starting-character-position portion of a Directory entry (5)
# Length of the implementation-defined portion: Number of characters in the implementation-defined portion of a Directory entry (0)
# Undefined: Undefined
=head1 EXAMPLE3
=for comment filename=serialize_marc_leader.pl
use strict;
use warnings;
use Data::MARC::Leader;
use MARC::Leader;
# Object.
my $obj = MARC::Leader->new;
# Data object.
my $data_marc_leader = Data::MARC::Leader->new(
'bibliographic_level' => 'm',
'char_coding_scheme' => 'a',
'data_base_addr' => 541,
'descriptive_cataloging_form' => 'i',
'encoding_level' => ' ',
'impl_def_portion_len' => '0',
'indicator_count' => '2',
'length' => 2200,
'length_of_field_portion_len' => '4',
'multipart_resource_record_level' => ' ',
'starting_char_pos_portion_len' => '5',
'status' => 'c',
'subfield_code_count' => '2',
'type' => 'e',
'type_of_control' => ' ',
'undefined' => '0',
);
# Serialize.
my $leader = $obj->serialize($data_marc_leader);
# Print to output.
print $leader."\n";
# Output:
# 02200cem a2200541 i 4500
=head1 DEPENDENCIES
L<Class::Utils>,
L<Data::MARC::Leader>,
L<Error::Pure>,
L<Scalar::Util>.
=head1 SEE ALSO
=over
=item L<Data::MARC::Leader>
Data object for MARC leader.
=back
=head1 REPOSITORY
L<https://github.com/michal-josef-spacek/MARC-Leader>
=head1 AUTHOR
Michal Josef Špaček L<mailto:skim@cpan.org>
L<http://skim.cz>
=head1 LICENSE AND COPYRIGHT
© 2023 Michal Josef Špaček
BSD 2-Clause License
=head1 VERSION
0.05
=cut