class Grom::Reader

Reads n-triple data and passes it to a Grom::Builder instance to create objects

@since 0.1.0 @attr_reader [String] data n-triple data. @attr_reader [Hash] statements_by_subject statements grouped by subject. @attr_reader [Hash] edges_by_subject subjects connected to objects which are uris via their predicates. @attr_reader [Array] objects Grom::Node objects generated from n-triple data.

Attributes

data[R]
edges_by_subject[R]
objects[R]
statements_by_subject[R]

Public Class Methods

new(data, decorators = nil) click to toggle source

@param [String] data n-triple data. @param [Module] decorators decorators to use when building Grom::Node objects.

# File lib/grom/reader.rb, line 14
def initialize(data, decorators = nil)
  @data = data

  read_data

  @objects = Grom::Builder.new(self, decorators).objects
end

Public Instance Methods

read_data() click to toggle source

Reads the n-triple data and separates the statements by subject.

@return [Grom::Reader] an instance of self.

# File lib/grom/reader.rb, line 25
def read_data
  @statements_by_subject = {}

  @edges_by_subject = {}

  RDF::NTriples::Reader.new(@data) do |reader|
    reader.each_statement do |statement|
      subject = statement.subject.to_s

      Grom::Helper.lazy_array_insert(@statements_by_subject, subject, statement)

      predicate = statement.predicate.to_s

      object_is_possible_link = statement.object.uri? || statement.object.is_a?(RDF::Node)
      predicate_is_not_a_type_definition = predicate != RDF.type.to_s

      if object_is_possible_link && predicate_is_not_a_type_definition
        predicate = Grom::Helper.get_id(predicate)
        @edges_by_subject[subject] ||= {}
        @edges_by_subject[subject][predicate] ||= []
        @edges_by_subject[subject][predicate] << statement.object.to_s
      end
    end
  end

  self
end