Class: SPARQL::Algebra::Operator::Order
- Inherits:
-
Binary
- Object
- SPARQL::Algebra::Operator
- Binary
- SPARQL::Algebra::Operator::Order
- Includes:
- Query
- Defined in:
- vendor/bundler/ruby/3.0.0/bundler/gems/sparql-ffa592c8f275/lib/sparql/algebra/operator/order.rb
Overview
The SPARQL GraphPattern order
operator.
Constant Summary collapse
- NAME =
[:order]
Constants inherited from Binary
Constants inherited from SPARQL::Algebra::Operator
Instance Attribute Summary
Attributes included from Query
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse
-
#execute(queryable, **options) {|solution| ... } ⇒ RDF::Query::Solutions
Executes this query on the given
queryable
graph or repository.
Methods included from Query
#each_solution, #empty?, #failed?, #graph_name=, #matched?, #query_yields_boolean?, #query_yields_solutions?, #query_yields_statements?, #unshift, #variables
Methods inherited from Binary
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, #formulae, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, #to_sxp, #to_sxp_bin, #validate!, #variable?, #vars
Methods included from Expression
cast, #constant?, #evaluate, 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::Binary
Instance Method Details
#execute(queryable, **options) {|solution| ... } ⇒ RDF::Query::Solutions
Executes this query on the given queryable
graph or repository.
Orders a solution set returned by executing operand(1) using
an array of expressions and/or variables specified in operand(0)
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# File 'vendor/bundler/ruby/3.0.0/bundler/gems/sparql-ffa592c8f275/lib/sparql/algebra/operator/order.rb', line 34 def execute(queryable, **, &block) debug() {"Order"} @solutions = queryable.query(operands.last, depth: [:depth].to_i + 1, **).order do |a, b| operand(0).inject(0) do |memo, op| debug() {"(order) #{op.inspect}"} memo = begin a_eval = op.evaluate(a, queryable: queryable, depth: [:depth].to_i + 1, **) rescue nil b_eval = op.evaluate(b, queryable: queryable, depth: [:depth].to_i + 1, **) rescue nil comp = Operator::Compare.evaluate(a_eval, b_eval).to_i comp = -comp if op.is_a?(Operator::Desc) comp end if memo == 0 memo end end @solutions.each(&block) if block_given? @solutions end |