Method: RDF::Writer#write_statement

Defined in:
lib/rdf/writer.rb

#write_statement(statement) ⇒ self Also known as: insert_statement

Note:

logs error if attempting to write an invalid Statement or if canonicalizing a statement which cannot be canonicalized.

Add a statement to the writer. This will check to ensure that the statement is complete (no nil terms) and is valid, if the :validation option is set.

Additionally, it will de-duplicate BNode terms sharing a common identifier.

Parameters:

Returns:

  • (self) 


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# File 'lib/rdf/writer.rb', line 477

def write_statement(statement)
  statement = statement.canonicalize! if canonicalize?

  # Make sure BNodes in statement use unique identifiers
  if statement.node?
    statement.to_quad.map do |term|
      if term.is_a?(RDF::Node)
        term = term.original while term.original
        @nodes[term] ||= begin
          # Account for duplicated nodes
          @node_id_map[term.to_s] ||= term
          if !@node_id_map[term.to_s].equal?(term)
            # Rename node
            term.make_unique!
            @node_id_map[term.to_s] = term
          end
        end
      else
        term
      end
    end
    statement = RDF::Statement.from(statement.to_quad)
  end

  if statement.incomplete?
    log_error "Statement #{statement.inspect} is incomplete"
  elsif validate? && statement.invalid?
    log_error "Statement #{statement.inspect} is invalid"
  elsif respond_to?(:write_quad)
    write_quad(*statement.to_quad)
  else
    write_triple(*statement.to_triple)
  end
  self
rescue ArgumentError => e
  log_error e.message + " at #{e.backtrace.first}"
end