/usr/share/perl5/RDF/Query/Algebra/Update.pm is in librdf-query-perl 2.918-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# -----------------------------------------------------------------------------
=head1 NAME
RDF::Query::Algebra::Update - Algebra class for UPDATE operations
=head1 VERSION
This document describes RDF::Query::Algebra::Update version 2.918.
=cut
package RDF::Query::Algebra::Update;
use strict;
use warnings;
no warnings 'redefine';
use base qw(RDF::Query::Algebra);
use Data::Dumper;
use Log::Log4perl;
use Scalar::Util qw(refaddr);
use Carp qw(carp croak confess);
use Scalar::Util qw(blessed reftype refaddr);
use Time::HiRes qw(gettimeofday tv_interval);
use RDF::Trine::Iterator qw(smap sgrep swatch);
######################################################################
our ($VERSION);
my %TRIPLE_LABELS;
my @node_methods = qw(subject predicate object);
BEGIN {
$VERSION = '2.918';
}
######################################################################
=head1 METHODS
Beyond the methods documented below, this class inherits methods from the
L<RDF::Query::Algebra> class.
=over 4
=cut
=item C<new ( $delete_template, $insert_template, $pattern, \%dataset, $data_only_flag )>
Returns a new UPDATE structure.
=cut
sub new {
my $class = shift;
my $delete = shift;
my $insert = shift;
my $pat = shift;
my $dataset = shift;
my $data = shift;
return bless([$delete, $insert, $pat, $dataset, $data], $class);
}
=item C<< construct_args >>
Returns a list of arguments that, passed to this class' constructor,
will produce a clone of this algebra pattern.
=cut
sub construct_args {
my $self = shift;
return ($self->delete_template, $self->insert_template, $self->pattern);
}
=item C<< sse >>
Returns the SSE string for this algebra expression.
=cut
sub sse {
my $self = shift;
my $context = shift;
my $indent = shift;
my $string;
my $delete = $self->delete_template;
my $insert = $self->insert_template;
my $dataset = $self->dataset;
my @ds_keys = keys %{ $dataset || {} };
if (@ds_keys) {
my @defaults = sort map { $_->sse } @{ $dataset->{default} || [] };
my @named = sort map { $_->sse } values %{ $dataset->{named} || {} };
my @strings;
push(@strings, (@defaults) ? '(defaults ' . join(' ', @defaults) . ')' : ());
push(@strings, (@named) ? '(named ' . join(' ', @named) . ')' : ());
my $ds_string = '(dataset ' . join(' ', @strings) . ')';
return sprintf(
"(update (delete %s) (insert %s) (where %s) %s)",
($delete ? $delete->sse( $context, $indent ) : ''),
($insert ? $insert->sse( $context, $indent ) : ''),
$self->pattern->sse( $context, $indent ),
$ds_string,
);
} else {
return sprintf(
"(update (delete %s) (insert %s) (where %s))",
($delete ? $delete->sse( $context, $indent ) : ''),
($insert ? $insert->sse( $context, $indent ) : ''),
$self->pattern->sse( $context, $indent ),
);
}
}
=item C<< as_sparql >>
Returns the SPARQL string for this algebra expression.
=cut
sub as_sparql {
my $self = shift;
my $context = shift || {};
my $indent = shift || '';
my $delete = $self->delete_template;
my $insert = $self->insert_template;
my $ggp = $self->pattern;
my $dataset = $self->dataset;
my @ds_keys = keys %{ $dataset || {} };
my $ds_string = '';
if (@ds_keys) {
my @defaults = @{ $dataset->{default} || [] };
my %named = %{ $dataset->{named} || {} };
my @strings;
push(@strings, sprintf("USING <%s>", $_->uri_value)) foreach (@defaults);
push(@strings, sprintf("USING NAMED <%s>", $named{$_}->uri_value)) foreach (keys %named);
$ds_string = join("\n${indent}", @strings);
}
if ($insert or $delete) {
# TODO: $(delete|insert)->as_sparql here isn't properly serializing GRAPH blocks, because even though they contain Quad objects inside of BGPs, there's no containing NamedGraph object...
if ($ds_string) {
$ds_string = "\n${indent}$ds_string";
}
if ($insert and $delete) {
return sprintf(
"DELETE {\n${indent} %s\n${indent}}\n${indent}INSERT {\n${indent} %s\n${indent}}\n${indent}%s\n${indent}WHERE %s",
$delete->as_sparql( $context, "${indent} " ),
$insert->as_sparql( $context, "${indent} " ),
$ds_string,
$ggp->as_sparql( { %$context, force_ggp_braces => 1 }, ${indent} ),
);
} elsif ($insert) {
return sprintf(
"INSERT {\n${indent} %s\n${indent}}\n${indent}%s\n${indent}WHERE %s",
$insert->as_sparql( $context, "${indent} " ),
$ds_string,
$ggp->as_sparql( { %$context, force_ggp_braces => 1 }, ${indent} ),
);
} else {
return sprintf(
"DELETE {\n${indent} %s\n${indent}}\n${indent}%s\n${indent}WHERE %s",
$delete->as_sparql( $context, "${indent} " ),
$ds_string,
$ggp->as_sparql( { %$context, force_ggp_braces => 1 }, ${indent} ),
);
}
} else {
my @pats = $ggp->patterns;
my $op = ($delete) ? 'DELETE' : 'INSERT';
my $temp = ($delete) ? $delete : $insert;
my $temps = ($temp->isa('RDF::Query::Algebra::GroupGraphPattern'))
? $temp->as_sparql( $context, "${indent} " )
: "{\n${indent} " . $temp->as_sparql( $context, "${indent} " ) . "\n${indent}}";
if (scalar(@pats) == 0) {
return sprintf(
"${op} DATA %s",
$temps
);
} else {
if ($ds_string) {
$ds_string = "\n${indent}$ds_string\n${indent}";
} else {
$ds_string = ' ';
}
return sprintf(
"${op} %s%sWHERE %s",
$temps,
$ds_string,
$ggp->as_sparql( { %$context, force_ggp_braces => 1 }, "${indent}" ),
);
}
}
}
=item C<< referenced_blanks >>
Returns a list of the blank node names used in this algebra expression.
=cut
sub referenced_blanks {
my $self = shift;
return;
}
=item C<< referenced_variables >>
=cut
sub referenced_variables {
my $self = shift;
return;
}
=item C<< delete_template >>
=cut
sub delete_template {
my $self = shift;
return $self->[0];
}
=item C<< insert_template >>
=cut
sub insert_template {
my $self = shift;
return $self->[1];
}
=item C<< pattern >>
=cut
sub pattern {
my $self = shift;
return $self->[2];
}
=item C<< dataset >>
=cut
sub dataset {
my $self = shift;
return $self->[3];
}
=item C<< data_only >>
=cut
sub data_only {
my $self = shift;
return $self->[4];
}
=item C<< check_duplicate_blanks >>
Returns true if blank nodes respect the SPARQL rule of no blank-label re-use
across BGPs, otherwise throws a RDF::Query::Error::QueryPatternError exception.
=cut
sub check_duplicate_blanks {
my $self = shift;
unless ($self->data_only) {
# if self isn't an INSERT/DELETE DATA operation, then we need to check the template patterns, too
if ($self->delete_template) {
$self->delete_template->check_duplicate_blanks;
}
if ($self->insert_tempalte) {
$self->insert_tempalte->check_duplicate_blanks;
}
}
return $self->pattern->check_duplicate_blanks;
}
1;
__END__
=back
=head1 AUTHOR
Gregory Todd Williams <gwilliams@cpan.org>
=cut
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