Module: ClassInheritableAttributes

Included in:
Orange::Application, Orange::Carton, Orange::Plugins::Base, Orange::Resource
Defined in:
lib/orange-core/magick.rb

Overview

Borrowed from Roman2k: github.com/Roman2K/class-inheritable-attributes/

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.eval_in_accessor_module(klass, code) ⇒ Object 



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# File 'lib/orange-core/magick.rb', line 45

def eval_in_accessor_module(klass, code)
  mod = klass.instance_eval { @_inheritable_attribute_accessors ||= Module.new }
  klass.extend(mod)
  mod.module_eval(code)
end

.fetch_value(klass, attribute) ⇒ Object 



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# File 'lib/orange-core/magick.rb', line 51

def fetch_value(klass, attribute)
  each_parent(klass) do |parent|
    if values = registry[parent] and values.key?(attribute)
      return values[attribute]
    elsif parent.instance_variable_defined?("@#{attribute}")
      return parent.instance_variable_get("@#{attribute}")
    end
  end
  return nil
end

.store_value(klass, attribute, value) ⇒ Object 



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# File 'lib/orange-core/magick.rb', line 62

def store_value(klass, attribute, value)
  if Thread.current == Thread.main
    if value.nil?
      klass.instance_eval do
        remove_instance_variable("@#{attribute}") if instance_variable_defined?("@#{attribute}")
      end
    else
      klass.instance_variable_set("@#{attribute}", value)
    end
  else
    registry[klass] ||= {}
    if value.nil?
      registry[klass].delete(attribute)
      registry.delete(klass) if registry[klass].empty?
    else
      registry[klass][attribute] = value
    end
  end
end

Instance Method Details

#cattr_accessor(*attributes) ⇒ Object 



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# File 'lib/orange-core/magick.rb', line 116

def cattr_accessor(*attributes)
  cattr_reader(*attributes)
  cattr_writer(*attributes)
end

#cattr_reader(*attributes) ⇒ Object 



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# File 'lib/orange-core/magick.rb', line 96

def cattr_reader(*attributes)
  attributes.each do |attribute|
    ClassInheritableAttributes.eval_in_accessor_module(self, <<-EOS)
      def #{attribute}
        #{ClassInheritableAttributes}.fetch_value(self, :#{attribute})
      end
    EOS
  end
end

#cattr_writer(*attributes) ⇒ Object 



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# File 'lib/orange-core/magick.rb', line 106

def cattr_writer(*attributes)
  attributes.each do |attribute|
    ClassInheritableAttributes.eval_in_accessor_module(self, <<-EOS)
      def #{attribute}=(value)
        #{ClassInheritableAttributes}.store_value(self, :#{attribute}, value)
      end
    EOS
  end
end