Class: RDFObject::ChangeSet

Inherits:
BlankNode
  • Object
show all
Defined in:
lib/rdf_objects/changeset/changeset.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(resource, versioned = false) ⇒ ChangeSet

Returns a new instance of ChangeSet.



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# File 'lib/rdf_objects/changeset/changeset.rb', line 5

def initialize(resource, versioned=false)
  @resource = resource
  @versioned = versioned
  @additions = []
  @removals = []
  super(UUID.generate)

  assert("[cs:createdDate]", Time.now)
  relate("[rdf:type]", "[cs:ChangeSet]")
  relate("[cs:subjectOfChange]", @resource.uri)      
end

Instance Attribute Details

#additions ⇒ Object (readonly)

Returns the value of attribute additions.



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# File 'lib/rdf_objects/changeset/changeset.rb', line 4

def additions
  @additions
end

#removals ⇒ Object (readonly)

Returns the value of attribute removals.



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# File 'lib/rdf_objects/changeset/changeset.rb', line 4

def removals
  @removals
end

#resource ⇒ Object (readonly)

Returns the value of attribute resource.



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# File 'lib/rdf_objects/changeset/changeset.rb', line 4

def resource
  @resource
end

Instance Method Details

#add_statement(predicate, object) ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 36

def add_statement(predicate, object)
  @additions << create_statement(predicate, object)
end

#clear_predicate(uri) ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 61

def clear_predicate(uri) 
  [*@resource[uri]].each do |object|
    next unless object
    @removals << create_statement(uri, object)
  end
end

#create_statement(predicate, object) ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 68

def create_statement(predicate, object)
  stmt = BlankNode.new(UUID.generate)
  stmt.relate("[rdf:type]", "[rdf:Statement]")
  stmt.relate("[rdf:subject]", @resource.uri)
  stmt.relate("[rdf:predicate]", predicate)      
  stmt.assert("[rdf:object]", object)
  stmt      
end

#creator_name=(name) ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 22

def creator_name=(name)
  self.cs['creatorName'] = nil if self.cs['creatorName']      
  assert("[cs:creatorName]", name)
end

#delete_all ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 27

def delete_all()
  @resource.assertions.each_pair do |predicate, objects|
    [*objects].each do |object|
      next unless object
      @removals <<  create_statement(predicate, object)
    end
  end 
end

#rdf_description_block(depth = 0) ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 77

def rdf_description_block(depth=0)
  rdf = "<rdf:Description #{xml_subject_attribute}>"
  namespaces = {}
  Curie.get_mappings.each_pair do |key, value|
    if self.respond_to?(key.to_sym)
      self.send(key.to_sym).each_pair do | predicate, objects |
        [*objects].each do | object |
          rdf << "<#{key}:#{predicate}"
          namespaces["xmlns:#{key}"] = "#{Curie.parse("[#{key}:]")}"
          if object.is_a?(RDFObject::ResourceReference) || object.is_a?(RDFObject::BlankNode)
            if depth == 0
              rdf << " #{object.xml_object_attribute} />"
            else
              rdf << ">"                  
              ns, rdf_data = object.rdf_description_block(depth-1)
              namespaces.merge!(ns)
              rdf << rdf_data
              rdf << "</#{key}:#{predicate}>"
            end
          else
            object = RDF::Literal.new(object) unless object.is_a?(RDF::Literal)
            if object.language
              rdf << " xml:lang=\"#{object.language}\""
            end
            if object.datatype
              rdf << " rdf:datatype=\"#{object.datatype}\""
            end
            rdf << ">#{CGI.escapeHTML(object.value)}</#{key}:#{predicate}>"
          end
        end
      end
    end
    if value == "http://purl.org/vocab/changeset/schema#"
      @removals.each do |removal|
        rdf << "<#{key}:removal>"
        ns, rdf_data = removal.rdf_description_block
        namespaces.merge!(ns)
        rdf << rdf_data            
        rdf << "</#{key}:removal>"
      end
      @additions.each do |addition|
        rdf << "<#{key}:addition>"
        ns, rdf_data = addition.rdf_description_block
        namespaces.merge!(ns)
        rdf << rdf_data
        rdf << "</#{key}:addition>"
      end                      
    end
  end
  
  rdf << "</rdf:Description>"
  [namespaces, rdf]
end

#reason=(reason_note) ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 17

def reason=(reason_note)
  self.cs['changeReason'] = nil if self.cs['changeReason']
  assert("[cs:changeReason]", reason_note)
end

#remove_statement(predicate, object) ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 40

def remove_statement(predicate, object)
  @removals << create_statement(predicate, object)
end

#replace_statements(from, to = nil) ⇒ Object 



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# File 'lib/rdf_objects/changeset/changeset.rb', line 44

def replace_statements(from, to=nil)
  from.each_pair do |pred, objects|
    [*objects].each do |o|
      next unless o
      @removals << create_statement(pred, o)
    end
  end
  if to and to.is_a?(Hash) and !to.empty?
    to.each_pair do |pred, objects|
      [*objects].each do |o|
        next unless o
        @additions << create_statement(pred, o)
      end
    end
  end
end