Class: SPARQL::Algebra::Operator::Create
- Inherits:
-
SPARQL::Algebra::Operator
- Object
- SPARQL::Algebra::Operator
- SPARQL::Algebra::Operator::Create
- Includes:
- Update
- Defined in:
- lib/sparql/algebra/operator/create.rb
Overview
The SPARQL UPDATE create
operator.
This operation creates a graph in the Graph Store
This is a no-op for RDF.rb implementations, unless the graph exists
[34] Create ::= ‘CREATE’ ‘SILENT’? GraphRef
Constant Summary collapse
- NAME =
[:create]
Constants inherited from SPARQL::Algebra::Operator
Constants included from Expression
Instance Attribute Summary
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse
-
#execute(queryable, **options) ⇒ RDF::Queryable
Executes this upate on the given
writable
graph or repository. -
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
Methods included from Update
#graph_name=, #unshift, #variables
Methods inherited from SPARQL::Algebra::Operator
#aggregate?, arity, #base_uri, base_uri, base_uri=, #bind, #boolean, #constant?, #deep_dup, #each_descendant, #eql?, #evaluatable?, evaluate, #executable?, #first_ancestor, for, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, to_sparql, #to_sxp, #to_sxp_bin, #validate!, #variable?, #variables, #vars
Methods included from Expression
cast, #constant?, #evaluate, extension, extension?, extensions, for, #invalid?, new, #node?, open, #optimize, #optimize!, parse, register_extension, #to_sxp_bin, #valid?, #validate!, #variable?
Constructor Details
This class inherits a constructor from SPARQL::Algebra::Operator
Instance Method Details
#execute(queryable, **options) ⇒ RDF::Queryable
Executes this upate on the given writable
graph or repository.
39 40 41 42 43 44 45 46 47 48 49 50 |
# File 'lib/sparql/algebra/operator/create.rb', line 39 def execute(queryable, **) debug() {"Create"} silent = operands.first == :silent operands.shift if silent iri = operands.first raise ArgumentError, "clear expected a single IRI" if operands.length != 1 || !iri.is_a?(RDF::URI) if queryable.has_graph?(iri) raise IOError, "create operation graph #{iri.to_ntriples} exists" unless silent end queryable end |
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
57 58 59 60 61 62 63 |
# File 'lib/sparql/algebra/operator/create.rb', line 57 def to_sparql(**) silent = operands.first == :silent str = "CREATE " str << "SILENT " if operands.first == :silent str << "GRAPH " if operands.last.is_a?(RDF::URI) str << operands.last.to_sparql(**) end |