NAME

Attean::SimpleQueryEvaluator - Simple query evaluator

VERSION

This document describes Attean::SimpleQueryEvaluator version 0.021

SYNOPSIS

  use v5.14;
  use Attean;
  my $algebra = Attean->get_parser('SPARQL')->parse('SELECT * WHERE { ... }');
  my $active_graph = Attean::IRI->new('http://example.org/');
  my $e = Attean::SimpleQueryEvaluator->new( model => $model );
  my $iter = $e->evaluate( $algebra, $active_graph );

DESCRIPTION

The Attean::SimpleQueryEvaluator class implements a simple query evaluator that, given an Attean::API::Algebra and a Attean::API::Model object, evaluates the query represented by the algebra using data from the model, and returns a query result.

ATTRIBUTES

model

The Attean::API::Model object used for query evaluation.

default_graph

The Attean::API::IRI object representing the default graph in the model. The default graph will be excluded from enumeration of graph names for query features such as GRAPH ?g {}.

METHODS

evaluate( $algebra, $active_graph )

Returns an Attean::API::Iterator object with results produced by evaluating the query $algebra against the evaluator's model, using the supplied $active_graph.

BUGS

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

SEE ALSO

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.