Module: Odca::Overlay

Class Method Summary collapse

Class Method Details

.extended(overlay) ⇒ Object



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# File 'lib/odca/overlay.rb', line 5

def self.extended(overlay)
  overlay_class_name = overlay.name.split('::').last

  overlay.class_eval do
    attr_reader :attributes

    def _initialize
      @attributes = []
    end

    alias_method :initialize, :_initialize

    def empty?
      attributes.empty?
    end

    def add_attribute(attr)
      return if attr.nil? || attr.value.nil?
      attributes << attr
    end

    def attr_values
      attributes.each_with_object({}) do |attr, memo|
        memo[attr.attr_name] = attr.value
      end
    end

    overlay.const_set(
      overlay_class_name.gsub('Overlay', '') << 'Attribute',
      Class.new do
        attr_reader :attr_name, :value

        def initialize(attr_name:, value:)
          @attr_name = attr_name
          @value = value
        end
      end
    )

    overlay.const_set(
      'InputValidator',
      Class.new do
        attr_reader :attr_name, :value

        def initialize(attr_name:, value:)
          if attr_name.strip.empty?
            raise 'Attribute name is expected to be non empty String'
          end

          @attr_name = attr_name
          @value = value
        end

        define_method :call do
          {
            attr_name: attr_name.strip,
            value: validate(value)
          }
        end

        def validate(input_value)
          if input_value.nil? || input_value.strip.empty?
            Odca::NullValue.new
          else
            input_value.strip
          end
        end
      end
    )
  end
end