Module: RTM::AR::Sugar::Topic::HashAccess

Included in:
Topic
Defined in:
lib/rtm/activerecord/sugar/topic/hash_access.rb

Overview

This module implements methods for Hash-like access in Topics.

Instance Method Summary collapse

Instance Method Details

#[](cref) ⇒ Object

Returns a list of names or occurrences depending on the arguments given.



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# File 'lib/rtm/activerecord/sugar/topic/hash_access.rb', line 11

def [](cref)
  # return occurrences by type if topic is given
  return occurrences.select{|o| o.type == cref} if cref.is_a? Topic
  raise "Characteristic reference must be a Topic or a String" unless cref.is_a? String
  # parse the given String to extract kind (name/occ), type and scope
  is_name, type_reference, scope_reference = resolve_characteristic(cref)
  if is_name
    type_reference = RTM::PSI[:name_type] if type_reference == :any
    ret = names.select{|n| n.type == topic_map.get(type_reference)}
  else
    raise "No occurrence type given" if type_reference == :any
    ret = occurrences.select{|o| o.type == topic_map.get(type_reference)}
  end
  # we now have a list of names or occurrences, now we have to select for scope
  return ret if scope_reference == :any
  if scope_reference == :ucs
    ret.select{|n| n.scope.size == 0}
  else
    ret.select{|n| scope_reference.all?{|sr| srt = topic_map.get(sr); srt && n.scope.include?(srt)}}
  end
end

#[]=(cref, value) ⇒ Object 



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# File 'lib/rtm/activerecord/sugar/topic/hash_access.rb', line 33

def []=(cref, value)
  is_name, type_reference, scope_reference = resolve_characteristic(cref)
  if is_name
    type_reference = nil if type_reference == :any
    nametype = type_reference || topic_map.get!(RTM::PSI[:name_type])
    ret = create_name(nametype, value)
  else
    raise "No occurrence type given" if type_reference == :any
    ret = create_occurrence(type_reference,value)
  end
  # return object without scope if any or ucs
  return ret if [:any, :ucs].include? scope_reference
  # set scope
  scope_reference.each do |sr|
    ret.scope << topic_map.get!(sr)
  end
end