Class: ActiveFedora::RdfNode::TermProxy

Inherits:
Object
  • Object
show all
Defined in:
lib/active_fedora/rdf_node/term_proxy.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent, subject, predicate, options) ⇒ TermProxy

Returns a new instance of TermProxy.

Parameters:

  • parent —

    RdfNode

  • subject —

    RDF::URI

  • options —

    Hash



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 12

def initialize(parent, subject, predicate, options)
  @parent = parent
  @subject = subject
  @predicate = predicate
  @options = options
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 5

def options
  @options
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 5

def parent
  @parent
end

#predicate ⇒ Object (readonly)

Returns the value of attribute predicate.



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 5

def predicate
  @predicate
end

#subject ⇒ Object (readonly)

Returns the value of attribute subject.



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 5

def subject
  @subject
end

Instance Method Details

#<<(*values) ⇒ Object 



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 40

def <<(*values)
  values.each { |value| parent.append(subject, predicate, value) }
  reset!
  values
end

#build(attributes = nil) ⇒ Object 



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 20

def build(attributes=nil)
  node = mint_node(attributes)
  parent.graph.insert([subject, predicate, node.rdf_subject])
  reset!
  new_node = target.find { |n| n.rdf_subject == node.rdf_subject}
  new_node.new_record = true
  new_node
end

#delete(*values) ⇒ Object 



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 46

def delete(*values)
  values.each do |value| 
    parent.delete_predicate(subject, predicate, value)
  end

  values
end

#load_values ⇒ Object 



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 58

def load_values
  values = []

  parent.query(subject, predicate).each do |solution|
    v = solution.value
    v = v.to_s if v.is_a? RDF::Literal
    if options[:type] == :date
      v = Date.parse(v)
    end
    # If the user provided options[:class_name], we should query to make sure this 
    # potential solution is of the right RDF.type
    if options[:class_name]
      klass =  class_from_rdf_type(v)
      values << v if klass == ActiveFedora.class_from_string(options[:class_name], parent.class)
    else
      values << v
    end
  end

  if options[:class_name]
    values = values.map{ |found_subject| class_from_rdf_type(found_subject).new(parent.graph, found_subject)}
  end
  
  values
end

#mint_node(attributes = nil) ⇒ Object 



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 33

def mint_node(attributes=nil)
  new_subject = RDF::Node.new
  return parent.target_class(predicate).new(parent.graph, new_subject).tap do |node|
    node.attributes = attributes if attributes
  end
end

#reset! ⇒ Object 



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 29

def reset!
  @target = nil
end

#target ⇒ Object 



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# File 'lib/active_fedora/rdf_node/term_proxy.rb', line 54

def target
  @target ||= load_values
end