Class: SPARQL::Algebra::Operator::Base

Inherits:
Binary show all
Includes:
Query
Defined in:
lib/sparql/algebra/operator/base.rb

Overview

The SPARQL GraphPattern base operator.

Examples:

(base <http://example.org/>
  (bgp (triple <a> <b> 123.0)))

See Also:

Constant Summary collapse

NAME = 
[:base]

Constants inherited from Binary

SPARQL::Algebra::Operator::Binary::ARITY

Constants inherited from SPARQL::Algebra::Operator

ARITY, IsURI

Instance Attribute Summary

Attributes included from Query

#solutions

Attributes inherited from SPARQL::Algebra::Operator

#operands, #options

Instance Method Summary collapse

Methods included from Query

#context=, #each_solution, #failed?, #matched?, #unshift, #variables

Methods inherited from Binary

#initialize

Methods inherited from SPARQL::Algebra::Operator

arity, base_uri, #base_uri, base_uri=, #boolean, #constant?, #eql?, #evaluatable?, evaluate, #executable?, for, #initialize, #inspect, #operand, prefixes, #prefixes, prefixes=, #to_sse, #to_sxp, #variable?

Methods included from Evaluatable

#apply, #evaluate, #memoize

Methods included from Expression

cast, #constant?, #evaluate, for, new, open, parse, #to_sse, #variable?

Constructor Details

This class inherits a constructor from SPARQL::Algebra::Operator::Binary

Instance Method Details

#execute(queryable, options = {}) ⇒ RDF::Query::Solutions

Executes this query on the given queryable graph or repository. Really a pass-through, as this is a syntactic object used for providing context for relative URIs.

Parameters:

  • queryable (RDF::Queryable) —

    the graph or repository to query

  • options (Hash{Symbol => Object}) (defaults to: {}) —

    any additional keyword options

Returns:

See Also:


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# File 'lib/sparql/algebra/operator/base.rb', line 28

def execute(queryable, options = {})
  debug("Base #{operands.first}", options)
  @solutions = operands.last.execute(queryable, options.merge(:depth => options[:depth].to_i + 1))
  debug("=> #{@solutions.inspect}", options)
  @solutions
end

#optimize ⇒ Union, RDF::Query

Returns an optimized version of this query.

Return optimized query

Returns:


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# File 'lib/sparql/algebra/operator/base.rb', line 41

def optimize
  operands.last.optimize
end