Class: RDF::Query::Solutions

Inherits:

Object

• Object
• RDF::Query::Solutions

Includes:

SPARQL::Results

Defined in:

lib/sparql/algebra/extensions.rb,
lib/sparql/extensions.rb

Overview

Extensions for RDF::Query::Solutions.

Constant Summary

Constants included from SPARQL::Results

SPARQL::Results::MIME_TYPES

Instance Method Summary

• #filter(expression = {}) {|solution| ... } (also: #filter!)

  Filters this solution sequence by the given criteria.

• #filter_without_expression ⇒ Object

Methods included from SPARQL::Results

#to_csv, #to_html, #to_json, #to_tsv, #to_xml

Instance Method Details

#filter(expression = {}) {|solution| ... } Also known as: filter!

This method returns an undefined value.

Filters this solution sequence by the given criteria.

Parameters:

• expression (SPARQL::Algebra::Expression) (defaults to: {})

Yields:

• (solution) —

  each solution

Yield Parameters:

• solution (RDF::Query::Solution)

Yield Returns:

• (Boolean)

# File 'lib/sparql/algebra/extensions.rb', line 638

def filter(expression = {}, &block)
  case expression
    when SPARQL::Algebra::Expression
      filter_without_expression do |solution|
        expression.evaluate(solution).true?
      end
      filter_without_expression(&block) if block_given?
      self
    else filter_without_expression(expression, &block)
  end
end

#filter_without_expression ⇒ Object

# File 'lib/sparql/algebra/extensions.rb', line 627

alias_method :filter_without_expression, :filter