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# RDF::Trine::Serializer::NTriples |
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# ----------------------------------------------------------------------------- |
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=head1 NAME |
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RDF::Trine::Serializer::NTriples - N-Triples Serializer |
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=head1 VERSION |
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This document describes RDF::Trine::Serializer::NTriples version 1.018 |
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=head1 SYNOPSIS |
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use RDF::Trine::Serializer::NTriples; |
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my $serializer = RDF::Trine::Serializer::NTriples->new(); |
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=head1 DESCRIPTION |
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The RDF::Trine::Serializer::NTriples class provides an API for serializing RDF |
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graphs to the N-Triples syntax. |
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=head1 METHODS |
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Beyond the methods documented below, this class inherits methods from the |
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L<RDF::Trine::Serializer> class. |
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=over 4 |
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=cut |
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package RDF::Trine::Serializer::NTriples; |
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use strict; |
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use warnings; |
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use base qw(RDF::Trine::Serializer); |
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use URI; |
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use Data::Dumper; |
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use RDF::Trine::Node; |
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use RDF::Trine::Statement; |
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use RDF::Trine::Error qw(:try); |
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###################################################################### |
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our ($VERSION); |
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BEGIN { |
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$VERSION = '1.018'; |
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$RDF::Trine::Serializer::serializer_names{ 'ntriples' } = __PACKAGE__; |
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$RDF::Trine::Serializer::format_uris{ 'http://www.w3.org/ns/formats/N-Triples' } = __PACKAGE__; |
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foreach my $type (qw(text/plain)) { |
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$RDF::Trine::Serializer::media_types{ $type } = __PACKAGE__; |
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} |
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} |
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###################################################################### |
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=item C<< new >> |
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Returns a new N-Triples serializer object. |
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=cut |
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sub new { |
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my $class = shift; |
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my %args = @_; |
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my $self = bless( {}, $class); |
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return $self; |
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} |
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=item C<< serialize_model_to_file ( $fh, $model ) >> |
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Serializes the C<$model> to N-Triples, printing the results to the supplied |
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filehandle C<<$fh>>. |
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=cut |
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sub serialize_model_to_file { |
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my $self = shift; |
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my $file = shift; |
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my $model = shift; |
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my $st = RDF::Trine::Statement->new( map { RDF::Trine::Node::Variable->new($_) } qw(s p o) ); |
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my $pat = RDF::Trine::Pattern->new( $st ); |
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my $stream = $model->get_pattern( $pat, undef, orderby => [ qw(s ASC p ASC o ASC) ] ); |
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my $iter = $stream->as_statements( qw(s p o) ); |
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while (my $st = $iter->next) { |
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print {$file} $self->statement_as_string( $st ); |
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} |
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} |
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=item C<< serialize_model_to_string ( $model ) >> |
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Serializes the C<$model> to N-Triples, returning the result as a string. |
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=cut |
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sub serialize_model_to_string { |
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my $self = shift; |
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my $model = shift; |
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my $st = RDF::Trine::Statement->new( map { RDF::Trine::Node::Variable->new($_) } qw(s p o) ); |
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my $pat = RDF::Trine::Pattern->new( $st ); |
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my $stream = $model->get_pattern( $pat, undef, orderby => [ qw(s ASC p ASC o ASC) ] ); |
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my $iter = $stream->as_statements( qw(s p o) ); |
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my $string = ''; |
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while (my $st = $iter->next) { |
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my @nodes = $st->nodes; |
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$string .= $self->statement_as_string( $st ); |
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} |
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return $string; |
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} |
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=item C<< serialize_iterator_to_file ( $file, $iter ) >> |
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Serializes the iterator to N-Triples, printing the results to the supplied |
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filehandle C<<$fh>>. |
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=cut |
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sub serialize_iterator_to_file { |
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my $self = shift; |
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my $file = shift; |
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my $iter = shift; |
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while (my $st = $iter->next) { |
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print {$file} $self->statement_as_string( $st ); |
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} |
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} |
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=item C<< serialize_iterator_to_string ( $iter ) >> |
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Serializes the iterator to N-Triples, returning the result as a string. |
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=cut |
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sub serialize_iterator_to_string { |
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my $self = shift; |
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my $iter = shift; |
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my $string = ''; |
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while (my $st = $iter->next) { |
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my @nodes = $st->nodes; |
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$string .= $self->statement_as_string( $st ); |
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} |
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return $string; |
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} |
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sub _serialize_bounded_description { |
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my $self = shift; |
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my $model = shift; |
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my $node = shift; |
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my $seen = shift || {}; |
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return '' if ($seen->{ $node->sse }++); |
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my $iter = $model->get_statements( $node, undef, undef ); |
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my $string = ''; |
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while (my $st = $iter->next) { |
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my @nodes = $st->nodes; |
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$string .= $self->statement_as_string( $st ); |
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if ($nodes[2]->isa('RDF::Trine::Node::Blank')) { |
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$string .= $self->_serialize_bounded_description( $model, $nodes[2], $seen ); |
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} |
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} |
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return $string; |
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} |
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=item C<< statement_as_string ( $st ) >> |
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Returns a string with the supplied RDF::Trine::Statement object serialized as |
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N-Triples, ending in a DOT and newline. |
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=cut |
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sub statement_as_string { |
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my $self = shift; |
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my $st = shift; |
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my @nodes = $st->nodes; |
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return join(' ', map { $_->as_ntriples } @nodes[0..2]) . " .\n"; |
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} |
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=item C<< serialize_node ( $node ) >> |
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Returns a string containing the N-Triples serialization of C<< $node >>. |
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=cut |
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186
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sub serialize_node { |
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my $self = shift; |
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my $node = shift; |
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return $node->as_ntriples; |
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} |
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192
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1; |
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194
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__END__ |
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196
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=back |
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198
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=head1 NOTES |
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200
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As described in L<RDF::Trine::Node::Resource/as_ntriples>, N-Triples serialization will |
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decode any L<punycode|http://www.ietf.org/rfc/rfc3492.txt> that is included in the IRI, |
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and serialize it using unicode codepoint escapes. |
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=head1 BUGS |
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Please report any bugs or feature requests to through the GitHub web interface |
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at L<https://github.com/kasei/perlrdf/issues>. |
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=head1 SEE ALSO |
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L<http://www.w3.org/TR/rdf-testcases/#ntriples> |
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=head1 AUTHOR |
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Gregory Todd Williams C<< <gwilliams@cpan.org> >> |
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=head1 COPYRIGHT |
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Copyright (c) 2006-2012 Gregory Todd Williams. This |
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program is free software; you can redistribute it and/or modify it under |
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the same terms as Perl itself. |
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=cut |