Class: BEL::BELRDF::StatementConverter

Inherits:
Object
  • Object
show all
Includes:
RDFConverter
Defined in:
lib/bel/translator/plugins/rdf2/statement_converter.rb

Instance Method Summary collapse

Methods included from RDFConverter

#s

Constructor Details

#initialize(term_converter, relationship_converter) ⇒ StatementConverter 



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# File 'lib/bel/translator/plugins/rdf2/statement_converter.rb', line 9

def initialize(term_converter, relationship_converter)
  @term_converter         = term_converter
  @rel_converter = relationship_converter
end

Instance Method Details

#convert(bel_statement) ⇒ RDF::Graph

Convert a BELParser::Expression::Model::Statement to RDF::Graph of RDF statements.



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# File 'lib/bel/translator/plugins/rdf2/statement_converter.rb', line 19

def convert(bel_statement)
  # Dive into subject
  sub_part, sub_uri, subg = @term_converter.convert(bel_statement.subject)

  # Dive into object
  case
  when bel_statement.simple?
    obj_part, obj_uri, objg = @term_converter.convert(bel_statement.object)
    rel_part, rel_uri       = @rel_converter.convert(bel_statement.relationship)
    path_part               = "#{sub_part}_#{rel_part}_#{obj_part}"
    stmt_uri                = BELR[URI::encode(path_part)]

    sg  = RDF::Graph.new
    sg << subg
    sg << objg
    sg << s(stmt_uri, RDF.type,           BELV2_0.Statement)
    sg << s(stmt_uri, BELV2_0.hasSubject,      sub_uri)
    sg << s(stmt_uri, BELV2_0.hasObject,       obj_uri)
    sg << s(stmt_uri, BELV2_0.hasRelationship, rel_uri) if rel_uri
  when bel_statement.nested?
    obj_part, obj_uri, objg = convert(bel_statement.object)
    rel_part, rel_uri       = @rel_converter.convert(bel_statement.relationship)
    path_part               = "#{sub_part}_#{rel_part}_#{obj_part}"
    stmt_uri                = BELR[URI::encode(path_part)]

    sg            = RDF::Graph.new
    sg << subg
    sg << objg
    sg << s(stmt_uri, RDF.type,           BELV2_0.Statement)
    sg << s(stmt_uri, BELV2_0.hasSubject, sub_uri)
    sg << s(stmt_uri, BELV2_0.hasObject,  obj_uri)
    sg << s(stmt_uri, BELV2_0.hasRelationship, rel_uri) if rel_uri
  else
    path_part      = sub_part
    stmt_uri       = BELR[URI::encode(path_part)]

    sg  = RDF::Graph.new
    sg << subg
    sg << s(stmt_uri, RDF.type,           BELV2_0.Statement)
    sg << s(stmt_uri, BELV2_0.hasSubject, sub_uri)
  end

  [path_part, stmt_uri, sg]
end