Module: RTM::Merging::Topic

Includes:

MergeItemIdentifiers, ReWrap

Defined in:

lib/rtm/activerecord/merging.rb

Instance Method Summary

• #merge(other) ⇒ Object (also: #merge_in)

Instance Method Details

#merge(other) ⇒ Object Also known as: merge_in

Raises:

• (TopicMergeException)

# File 'lib/rtm/activerecord/merging.rb', line 142

def merge(other)
  return unless other
  # The procedure for merging two topic items A and B
  # -> we will instead just modify a
  # (whose [parent] properties shall contain the same topic map item) is given below.
  raise TopicMergeException, "Both topics must belong to the same topic map!" if self.parent.__getobj__ != other.parent.__getobj__
  # It is an error if A and B both have non-null values in their [reified] properties which are different.
  raise TopicMergeException, "The Topics must not reify different things." if self.reified && other.reified && self.reified.__getobj__ != other.reified.__getobj__

  # 1. Create a new topic item C.
  # 2. Replace A by C wherever it appears in one of the following properties
  #    of an information item: [topics], [scope], [type], [player], and [reifier].
  # -> nothing to do here

  # 3. Repeat for B.
  # [topics]
  # done below, in rewrap
  # [scope]
  RTM::AR::TMDM::ScopedObjectsTopic.move_all(["topic_id", other.__getobj__.id, self.__getobj__.id])
  # [type]
  RTM::AR::TMDM::Association.move_all(["ttype_id", other.__getobj__.id, self.__getobj__.id])
  RTM::AR::TMDM::Role.move_all(["ttype_id", other.__getobj__.id, self.__getobj__.id])
  RTM::AR::TMDM::Name.move_all(["ttype_id", other.__getobj__.id, self.__getobj__.id])
  RTM::AR::TMDM::Occurrence.move_all(["ttype_id", other.__getobj__.id, self.__getobj__.id])

  # [player]
  RTM::AR::TMDM::AssociationRole.move_all(["topic_id", other.__getobj__.id, self.__getobj__.id])

  # [reifier]
  if other.reified
    self.reified = other.reified
  end
  # 4. Set C's [topic names] property to the union of the values of A and B's [topic names] properties.
  #self.names.add_all other.names
  count = RTM::AR::TMDM::Name.move_all(["topic_id", other.__getobj__.id, self.__getobj__.id])
  if count != 0 && count != names.size
    names.each_with_index do |n,i|
      (i+1).upto(names.size-1) do |j|
        if n == names[j]
          n.merge names[j]
        end
      end
    end
  end

  # 5. Set C's [occurrences] property to the union of the values of A and B's [occurrences] properties.
  #self.occurrences.add_all other.occurrences
  RTM::AR::TMDM::Occurrence.move_all(["topic_id", other.__getobj__.id, self.__getobj__.id])
  if count != 0 && count != occurrences.size
    occurrences.each_with_index do |o,i|
      (i+1).upto(occurrences.size-1) do |j|
        if o == occurrences[j]
          o.merge occurrences[j]
        end
      end
    end
  end

  # 6. Set C's [subject identifiers] property to the union of the values of A and B's [subject identifiers] properties.
  #self.subject_identifiers.add_all other.subject_identifiers
  RTM::AR::TMDM::SubjectIdentifier.move_all(["topic_id", other.__getobj__.id, self.__getobj__.id])

  # 7. Set C's [subject locators] property to the union of the values of A and B's [subject locators] properties.
  #self.subject_locators.add_all other.subject_locators
  RTM::AR::TMDM::SubjectLocator.move_all(["topic_id", other.__getobj__.id, self.__getobj__.id])

  # 8. Set C's [item identifiers] property to the union of the values of A and B's [item identifiers] properties.
  #self.item_identifiers.add_all other.item_identifiers
  #RTM::AR::TMDM::ItemIdentifier.update_all "construct_id = #{self.__getobj__.id}, construct_type = '#{self.__getobj__.class.name}'", "construct_id = #{other.__getobj__.id} and construct_type = '#{other.__getobj__.class.name}'"
  RTM::AR::TMDM::ItemIdentifier.move_all(
    ["construct_id", other.__getobj__.id, self.__getobj__.id],
    ["construct_type", other.__getobj__.class.name, self.__getobj__.class.name]
  )

  self.merge_rewrap other

  self
end