Class: Domain::HeadingBased::DomainMethods

Inherits:
Module
  • Object
show all
Defined in:
lib/alf/ext/domain/heading_based.rb

Instance Method Summary collapse

Constructor Details

#initialize(master_class, gt) ⇒ DomainMethods

Returns a new instance of DomainMethods.



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# File 'lib/alf/ext/domain/heading_based.rb', line 32

def initialize(master_class, gt)
  define_method(:generating_type){
    gt
  }
  define_method(:dum){
    @dum ||= new(EMPTY_SET)
  }
  define_method(:<=>){|other|
    return 0 if self == other
    return nil unless other.ancestors.include?(master_class)
    return -1 if other == master_class
    to_heading <=> other.to_heading
  }
  define_method(:===){|value|
    super(value) || (value.is_a?(master_class) && self >= value.class)
  }
  define_method(:hash){
    @hash ||= 37*master_class.hash + generating_type.hash
  }
  define_method(:==){|other|
    other.is_a?(Class) &&
    other.superclass==master_class &&
    other.to_heading==to_heading
  }
  define_method(:coerce){|arg|
    return arg if self==arg.class
    master_class.coercions.apply(arg, self)
  }
  define_method(:to_heading){
    @heading ||= Alf::Heading.coerce(generating_type)
  }
  define_method(:to_tuple_type){
    return self if Alf::Tuple==master_class
    return gt   if gt.is_a?(Class) && gt < Alf::Tuple
    @tuple_type ||= Alf::Tuple[to_heading]
  }
  define_method(:recursive?){
    h = to_heading
    h.to_attr_list.any?{|a| h[a] == self}
  }
  define_method(:to_ruby_literal){
    recursive? ?
      "#{master_class.name}[...]" :
      "#{master_class.name}[#{Alf::Support.to_ruby_literal(to_heading.to_hash)}]"
  }
  alias_method :name, :to_ruby_literal
  alias_method :to_s, :to_ruby_literal
  alias_method :inspect, :to_ruby_literal
end