Module: Tripod::Repository

Extended by:
ActiveSupport::Concern
Included in:
Components
Defined in:
lib/tripod/repository.rb

Overview

This module wraps access to an RDF::Repository

Defined Under Namespace

Modules: ClassMethods

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#repository ⇒ Object (readonly)

Returns the value of attribute repository.



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# File 'lib/tripod/repository.rb', line 7

def repository
  @repository
end

Instance Method Details

#get_triples_for_this_resource ⇒ Object

returns a graph of triples from the underlying repository where this resource’s uri is the subject.



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# File 'lib/tripod/repository.rb', line 63

def get_triples_for_this_resource
  triples_graph = RDF::Graph.new
  @repository.query([RDF::URI.new(self.uri), :predicate, :object]) do |stmt|
    triples_graph << stmt
  end
  triples_graph
end

#hydrate!(opts = {}) ⇒ RDF::Repository

hydrates the resource’s repo with statements from the db or passed in graph of statements. where the subject is the uri of this resource.

Examples:

Hydrate the resource from the db

person.hydrate!

Hydrate the resource from a passed in graph

person.hydrate!(:graph => my_graph)

Returns:

  • (RDF::Repository) —

    A reference to the repository for this instance.

Raises:



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# File 'lib/tripod/repository.rb', line 20

def hydrate!(opts = {})

  graph = opts[:graph]

  # we require that the uri is set.
  raise Tripod::Errors::UriNotSet.new() unless @uri

  @repository = RDF::Repository.new # make sure that the repo is empty before we begin

  if graph
    graph.each_statement do |statement|
      # Note that we use all statements, even those not about this resource, in case we're being
      # passed eager-loaded ones.
      @repository << statement
    end
  else

    triples = retrieve_triples_from_database

    @repository = RDF::Repository.new
    RDF::Reader.for(:ntriples).new(triples) do |reader|
      reader.each_statement do |statement|
        @repository << statement
      end
    end
  end

end

#repository_as_graph ⇒ Object

returns a graph of all triples in the repository



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# File 'lib/tripod/repository.rb', line 50

def repository_as_graph
  g = RDF::Graph.new
  @repository.each_statement do |s|
    g << s
  end
  g
end

#retrieve_triples_from_database(accept_header = Tripod.ntriples_header_str) ⇒ Object 



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# File 'lib/tripod/repository.rb', line 58

def retrieve_triples_from_database(accept_header=Tripod.ntriples_header_str)
  Tripod::SparqlClient::Query.query(self.class.all_triples_query(uri, graph_uri: self.graph_uri), accept_header)
end