Class: LD::Patch::Algebra::Prefix

Inherits:
SPARQL::Algebra::Operator::Binary
  • Object
show all
Includes:
SPARQL::Algebra::Update
Defined in:
lib/ld/patch/algebra/prefix.rb

Overview

The LD Patch ‘prefix` operator.

Examples:

(prefix ((: <http://example/>))
  (graph ?g
    (bgp (triple ?s ?p ?o))))

See Also:

Constant Summary collapse

NAME = 
:prefix

Instance Method Summary collapse

Instance Method Details

#execute(queryable, options = {}) {|solution| ... } ⇒ 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 URIs.

Yields:

  • (solution) —

    each matching solution, statement or boolean

Yield Parameters:

  • solution (RDF::Statement, RDF::Query::Solution, Boolean)

Yield Returns:

  • (void) —

    ignored

See Also:



32
33
34
35
 
# File 'lib/ld/patch/algebra/prefix.rb', line 32

def execute(queryable, options = {}, &block)
  debug(options) {"Prefix"}
  @solutions = queryable.query(operands.last, **options.merge(depth: options[:depth].to_i + 1), &block)
end

#optimize ⇒ Union, RDF::Query

Returns an optimized version of this query.

If optimize operands, and if the first two operands are both Queries, replace with the unique sum of the query elements



44
45
46
 
# File 'lib/ld/patch/algebra/prefix.rb', line 44

def optimize
  operands.last.optimize
end