Class: RoadForest::Graph::FocusList

Inherits:
RDF::List
  • Object
show all
Defined in:
lib/roadforest/graph/focus-list.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#base_node ⇒ Object

Returns the value of attribute base_node.



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# File 'lib/roadforest/graph/focus-list.rb', line 6

def base_node
  @base_node
end

#root_url ⇒ Object

Returns the value of attribute root_url.



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# File 'lib/roadforest/graph/focus-list.rb', line 6

def root_url
  @root_url
end

Instance Method Details

#append(value) ⇒ Object Also known as: << 



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# File 'lib/roadforest/graph/focus-list.rb', line 22

def append(value)
  value = case value
    when nil         then RDF.nil
    when RDF::Value  then value
    when Array       then RDF::List.new(nil, graph, value)
    else value
  end

  if empty?
    new_subject = subject
    #graph.insert([new_subject, RDF.type, RDF.List])
  else
    old_subject, new_subject = last_subject, RDF::Node.new
    graph.delete([old_subject, RDF.rest, RDF.nil])
    graph.insert([old_subject, RDF.rest, new_subject])
  end

  graph.insert([new_subject, RDF.first, value.is_a?(RDF::List) ? value.subject : value])
  graph.insert([new_subject, RDF.rest, RDF.nil])

  self
end

#append_node(subject = nil) ⇒ Object 



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# File 'lib/roadforest/graph/focus-list.rb', line 46

def append_node(subject=nil)
  if empty? and self.subject == RDF.nil
    raise "Attempted to append #{subject} to an empty list (remove the list and replace it)"
  end

  base_node.create_node(subject) do |node|
    append(node.subject)
    yield node if block_given?
  end
end

#car ⇒ Object 



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# File 'lib/roadforest/graph/focus-list.rb', line 8

alias car first

#each ⇒ Object 



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# File 'lib/roadforest/graph/focus-list.rb', line 15

def each
  return to_enum unless block_given?
  super do |value|
    yield base_node.unwrap_value(value)
  end
end

#first ⇒ Object 



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# File 'lib/roadforest/graph/focus-list.rb', line 11

def first
  at(0)
end