Module: AttributedClass

Defined in:
lib/attributed_class.rb

Overview

Extension to have inherited, class attributes, Where each class have his own attributes set.

Defined Under Namespace

Classes: Attribute, AttributeError, MethodAttribute

Class Method Summary collapse

Class Method Details

.included(aClass) ⇒ Object 



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# File 'lib/attributed_class.rb', line 176

def self.included ( aClass )

  aClass.module_eval do

    def initialize_attributes ( *default_proc_args )
      self.class.attributes.each do |attr|
        next if attr.is_a? MethodAttribute
        default = attr.compute_default(default_proc_args)
        if default.nil?
          instance_variable_set("@#{attr.name}", nil)
        else
          send "#{attr.name}=", default
        end
      end
    end

    def self.set_default_proc ( &block )
      Attribute.set_default_proc(&block)
    end

    def each_attribute ( &block )
      self.class.attributes.each do |attr|
        block[attr, send(attr.name)]
      end
    end

    def each_variable_attribute ( &block )
      self.class.attributes.each do |attr|
        next if attr.is_a? MethodAttribute
        block[attr, send(attr.name)]
      end
    end

    def each_method_attribute ( &block )
      self.class.attributes.each do |attr|
        next unless attr.is_a? MethodAttribute
        block[attr, send(attr.name)]
      end
    end

    def check_attribute ( attr, anObject )
      unless attr.valid? anObject
        raise AttributeError.new(self, attr, anObject)
      end
    end

    def check_attributes
      each_variable_attribute(&method(:check_attribute))
    end

    def self.help ( output=STDERR )
      output.puts "#{self.to_s}:"
      attributes.each do |attr|
        output << '  '
        attr.help(output)
        output.puts '.'
      end
    end

    def self.attributes
      unless defined? @attributes
        if superclass and superclass.respond_to? :attributes
          @attributes = superclass.attributes.dup
        else
          @attributes = []
        end
      end
      @attributes
    end

    def self.attribute ( name, descr, *args, &block )
      attr = Attribute.new(name, descr, *args, &block)
      unless method_defined? name
        if att = get_attribute(name, MethodAttribute)
          attributes.delete(att)
        end
        class_eval <<-"end;", __FILE__, __LINE__
          def #{name}(arg=nil, &block)
            if arg.nil?
              if block.nil?
                @#{name}
              else
                self.#{name} = block[]
              end
            else
              self.#{name} = arg
            end
          end
        end;
      end
      meth = "#{name}="
      unless method_defined? meth
        if att = get_attribute(meth, MethodAttribute)
          attributes.delete(att)
        end
        attr_writer name
      end
      attributes << attr
    end

    def self.method_attribute ( name, descr, *args, &block )
      # unless method_defined? name
        # raise ArgumentError, "Undefined method #{name}"
      # end
      attr = MethodAttribute.new(name, descr, *args, &block)
      attributes << attr
    end

    def self.get_attribute ( name, type=nil )
      if type.nil?
        attributes.find { |attr| attr.name == name }
      else
        attributes.find { |attr| attr.name == name && attr.is_a?(type) }
      end
    end

  end

end