NAME

AtteanX::Store::Memory - Simple in-memory RDF store

VERSION

This document describes AtteanX::Store::Memory version 0.027

SYNOPSIS

use AtteanX::Store::Memory;

DESCRIPTION

AtteanX::Store::Memory provides an in-memory quad-store.

ATTRIBUTES

subject

predicate

object

graph

METHODS

Beyond the methods documented below, this class inherits methods from the Attean::API::QuadStore class.

new ()

Returns a new memory-backed storage object.

size

Returns the number of quads in the store.

get_quads ( $subject, $predicate, $object, $graph )

Returns a stream object of all statements matching the specified subject, predicate and objects. Any of the arguments may be undef to match any value.

get_graphs

Returns an iterator over the Attean::API::Term objects comprising the set of graphs of the stored quads.

add_quad ( $quad )

Adds the specified $quad to the underlying model.

remove_quad ( $statement )

Removes the specified $statement from the underlying model.

remove_quads ( $subject, $predicate, $object, $graph )

Removes the specified $statement from the underlying model.

create_graph( $graph )

This is a no-op function for the memory quad-store.

drop_graph( $graph )

Removes all quads with the given $graph.

clear_graph( $graph )

Removes all quads with the given $graph.

count_quads ( $subject, $predicate, $object, $graph )

Returns a count of all the statements matching the specified subject, predicate, object, and graph. Any of the arguments may be undef to match any value.

etag_value_for_quads

If the store has the capability and knowledge to support caching, returns a persistent token that will remain consistent as long as the store's data doesn't change. This token is acceptable for use as an HTTP ETag.

mtime_for_quads

plans_for_algebra

The store implements a cost-based query planner, but this method is reimplemented to hand the overall control of the planning process to an external planner by returning undef.

cost_for_plan

This store provides a cost estimate only for retrieving individual quad patterns in this method. It will allow other planners to estimate the cost for any other parts of the plan by returning undef for those parts.

BUGS

Please report any bugs or feature requests to through the GitHub web interface at https://github.com/kasei/perlrdf2/issues.

AUTHOR

Gregory Todd Williams <gwilliams@cpan.org>

COPYRIGHT

Copyright (c) 2014--2020 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.