/usr/share/perl5/RDF/Query/Plan/Iterator.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::Plan::Iterator - Executable query plan for result-generating iterators.
=head1 VERSION
This document describes RDF::Query::Plan::Iterator version 2.918.
=head1 METHODS
Beyond the methods documented below, this class inherits methods from the
L<RDF::Query::Plan> class.
=over 4
=cut
package RDF::Query::Plan::Iterator;
use strict;
use warnings;
use base qw(RDF::Query::Plan);
use Scalar::Util qw(blessed reftype);
######################################################################
our ($VERSION);
BEGIN {
$VERSION = '2.918';
}
######################################################################
=item C<< new ( $iter, \&execute_cb ) >>
=item C<< new ( \&create_iterator_cb ) >>
=cut
sub new {
my $class = shift;
my $iter = shift;
my $cb = shift;
my $self = $class->SUPER::new( $iter, $cb );
$self->[0]{referenced_variables} = [];
return $self;
}
=item C<< execute ( $execution_context ) >>
=cut
sub execute ($) {
my $self = shift;
my $context = shift;
$self->[0]{delegate} = $context->delegate;
if ($self->state == $self->OPEN) {
throw RDF::Query::Error::ExecutionError -text => "ITERATOR plan can't be executed while already open";
}
if (ref($self->[2])) {
$self->[2]->( $context );
}
# if we don't have an actual iterator, but only a promise of one, construct it now
if (reftype($self->[1]) eq 'CODE' and not(blessed($self->[1]) and $self->[1]->isa('RDF::Trine::Iterator'))) {
$self->[1] = $self->[1]->( $context );
}
$self->state( $self->OPEN );
$self;
}
=item C<< next >>
=cut
sub next {
my $self = shift;
unless ($self->state == $self->OPEN) {
throw RDF::Query::Error::ExecutionError -text => "next() cannot be called on an un-open ITERATOR";
}
my $iter = $self->[1];
my $bindings = $iter->next;
if (my $d = $self->delegate) {
$d->log_result( $self, $bindings );
}
return $bindings;
}
=item C<< close >>
=cut
sub close {
my $self = shift;
unless ($self->state == $self->OPEN) {
throw RDF::Query::Error::ExecutionError -text => "close() cannot be called on an un-open ITERATOR";
}
my $iter = $self->[1];
$iter->close;
$self->SUPER::close();
}
=item C<< distinct >>
Returns true if the pattern is guaranteed to return distinct results.
=cut
sub distinct {
return 0;
}
=item C<< ordered >>
Returns true if the pattern is guaranteed to return ordered results.
=cut
sub ordered {
return [];
}
=item C<< plan_node_name >>
Returns the string name of this plan node, suitable for use in serialization.
=cut
sub plan_node_name {
return 'optimized-iterator';
}
=item C<< plan_prototype >>
Returns a list of scalar identifiers for the type of the content (children)
nodes of this plan node. See L<RDF::Query::Plan> for a list of the allowable
identifiers.
=cut
sub plan_prototype {
my $self = shift;
return qw();
}
=item C<< plan_node_data >>
Returns the data for this plan node that corresponds to the values described by
the signature returned by C<< plan_prototype >>.
=cut
sub plan_node_data {
my $self = shift;
return;
}
1;
__END__
=back
=head1 AUTHOR
Gregory Todd Williams <gwilliams@cpan.org>
=cut
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