Module: ClassProp::ClassMethods

Defined in:
lib/classprop.rb

Overview

ClassMethods

Instance Method Summary collapse

Instance Method Details

#define_class_prop(prop_name, opts = {}) ⇒ Object

Defines the set and get methods for the given property.

option: init Sets the initial value of the property.

option: inherit If set to false, the property is not inherited by subclasses.



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# File 'lib/classprop.rb', line 53

def define_class_prop(prop_name, opts={})
  # default options
  opts = {'inherit'=>true}.merge(opts)
  
  # set
  self.define_singleton_method("#{prop_name}=") do |val|
    instance_variable_set "@#{prop_name}", val
  end
  
  # get
  self.define_singleton_method(prop_name) do
    if instance_variable_defined?("@#{prop_name}")
      rv = instance_variable_get("@#{prop_name}")
      
      if rv == ClassProp::MustDefine
        raise "must-define-class-property: #{prop_name}" 
      else
        return rv
      end
    else
      if opts['inherit'] and superclass.respond_to?(prop_name)
        return superclass.public_send(prop_name)
      else
        return nil
      end
    end
  end
  
  # initial value
  if opts.has_key?('init')
    instance_variable_set "@#{prop_name}", opts['init']
  end
end

#delete_class_prop(prop_name) ⇒ Object

delete_class_prop



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# File 'lib/classprop.rb', line 88

def delete_class_prop(prop_name)
  if instance_variable_defined?("@#{prop_name}")
    remove_instance_variable "@#{prop_name}"
  end
end