Class: Grom::Reader

Inherits:
Object
  • Object
show all
Defined in:
lib/grom/reader.rb

Overview

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

Since:

  • 0.1.0

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data, decorators = nil) ⇒ Reader

Returns a new instance of Reader.

Parameters:

  • data (String) —

    n-triple data.

  • decorators (Module) (defaults to: nil) —

    decorators to use when building Grom::Node objects.

Since:

  • 0.1.0



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# File 'lib/grom/reader.rb', line 14

def initialize(data, decorators = nil)
  @data = data

  read_data

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

Instance Attribute Details

#data ⇒ String (readonly)

n-triple data.

Returns:

  • (String) —

    the current value of data

Since:

  • 0.1.0



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# File 'lib/grom/reader.rb', line 9

def data
  @data
end

#edges_by_subject ⇒ Hash (readonly)

subjects connected to objects which are uris via their predicates.

Returns:

  • (Hash) —

    the current value of edges_by_subject

Since:

  • 0.1.0



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# File 'lib/grom/reader.rb', line 9

def edges_by_subject
  @edges_by_subject
end

#objects ⇒ Array (readonly)

Grom::Node objects generated from n-triple data.

Returns:

  • (Array) —

    the current value of objects

Since:

  • 0.1.0



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# File 'lib/grom/reader.rb', line 9

def objects
  @objects
end

#statements_by_subject ⇒ Hash (readonly)

statements grouped by subject.

Returns:

  • (Hash) —

    the current value of statements_by_subject

Since:

  • 0.1.0



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# File 'lib/grom/reader.rb', line 9

def statements_by_subject
  @statements_by_subject
end

Instance Method Details

#read_data ⇒ Grom::Reader

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

Returns:

Since:

  • 0.1.0



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# 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