class SPARQL::Algebra::Operator::Base
The SPARQL
GraphPattern `base` operator.
@example
(base <http://example.org/> (bgp (triple <a> <b> 123.0)))
Constants
- NAME
Public Instance Methods
execute(queryable, **options, &block)
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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.
@param [RDF::Queryable] queryable
the graph or repository to query
@param [Hash{Symbol => Object}] options
any additional keyword options
@yield [solution]
each matching solution, statement or boolean
@yieldparam [RDF::Statement, RDF::Query::Solution
, Boolean] solution @yieldreturn [void] ignored @return [RDF::Queryable, RDF::Query::Solutions]
the resulting solution sequence
@see www.w3.org/TR/sparql11-query/#sparqlAlgebra
# File lib/sparql/algebra/operator/base.rb, line 32 def execute(queryable, **options, &block) debug(options) {"Base #{operands.first}"} Operator.base_uri = operands.first queryable.query(operands.last, depth: options[:depth].to_i + 1, **options, &block) end
optimize(**options)
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Return optimized query
@return [Base] a copy of `self` @see SPARQL::Algebra::Expression#optimize
# File lib/sparql/algebra/operator/base.rb, line 43 def optimize(**options) Operator.base_uri = operands.first operands.last.optimize(**options) end
query_yields_boolean?()
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Query
results in a boolean result (e.g., ASK) @return [Boolean]
# File lib/sparql/algebra/operator/base.rb, line 50 def query_yields_boolean? operands.last.query_yields_boolean? end
query_yields_statements?()
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Query
results statements (e.g., CONSTRUCT, DESCRIBE, CREATE) @return [Boolean]
# File lib/sparql/algebra/operator/base.rb, line 56 def query_yields_statements? operands.last.query_yields_statements? end