class SPARQL::Algebra::Operator::Prefix
The SPARQL
GraphPattern `prefix` operator.
@example
(prefix ((: <http://example/>)) (graph ?g (bgp (triple ?s ?p ?o))))
Constants
- NAME
Public Instance Methods
Executes this query on the given `queryable` graph or repository. Really a pass-through, as this is a syntactic object used for providing graph_name for 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::Query::Solutions]
the resulting solution sequence
@see www.w3.org/TR/sparql11-query/#sparqlAlgebra
# File lib/sparql/algebra/operator/prefix.rb, line 33 def execute(queryable, **options, &block) debug(options) {"Prefix"} @solutions = queryable.query(operands.last, depth: options[:depth].to_i + 1, **options, &block) end
Combine two prefix definitions, merging their definitions @param [Prefix] other @return [Prefix] self
# File lib/sparql/algebra/operator/prefix.rb, line 52 def merge!(other) operands[0] += other.operands[0] self end
Returns an optimized version of this query.
Replace
with the query with URIs having their lexical shortcut removed
@return [Prefix] a copy of `self` @see SPARQL::Algebra::Expression#optimize
# File lib/sparql/algebra/operator/prefix.rb, line 45 def optimize(**options) operands.last.optimize(**options) end
Query
results in a boolean result (e.g., ASK) @return [Boolean]
# File lib/sparql/algebra/operator/prefix.rb, line 59 def query_yields_boolean? operands.last.query_yields_boolean? end
Query
results statements (e.g., CONSTRUCT, DESCRIBE, CREATE) @return [Boolean]
# File lib/sparql/algebra/operator/prefix.rb, line 65 def query_yields_statements? operands.last.query_yields_statements? end