NAME

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

VERSION

       This document describes AtteanX::Store::Memory version 0.019

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--2018 Gregory Todd Williams. This program is free software; you can
       redistribute it and/or modify it under the same terms as Perl itself.