AtteanX::Store::Memory3pm

Usage

 use AtteanX::Store::Memory;

Version

This document describes AtteanX::Store::Memory version 0.035

Overview

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.