Method: Puppet::Util::ProviderFeatures#feature_module

Defined in:
lib/puppet/util/provider_features.rb

#feature_module ⇒ Object

Generates a module that sets up the boolean predicate methods to test for given features.



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# File 'lib/puppet/util/provider_features.rb', line 118

def feature_module
  unless defined?(@feature_module)
    @features ||= {}
    @feature_module = ::Module.new
    const_set("FeatureModule", @feature_module)
    features = @features
    # Create a feature? method that can be passed a feature name and
    # determine if the feature is present.
    @feature_module.send(:define_method, :feature?) do |name|
      method = name.to_s + "?"
      return !!(respond_to?(method) and send(method))
    end

    # Create a method that will list all functional features.
    @feature_module.send(:define_method, :features) do
      return false unless defined?(features)

      features.keys.find_all { |n| feature?(n) }.sort_by(&:to_s)
    end

    # Create a method that will determine if a provided list of
    # features are satisfied by the curred provider.
    @feature_module.send(:define_method, :satisfies?) do |*needed|
      ret = true
      needed.flatten.each do |feature|
        unless feature?(feature)
          ret = false
          break
        end
      end
      ret
    end

    # Create a boolean method for each feature so you can test them
    # individually as you might need.
    @features.each do |name, feature|
      method = name.to_s + "?"
      @feature_module.send(:define_method, method) do
        (is_a?(Class) ? declared_feature?(name) : self.class.declared_feature?(name)) or feature.available?(self)
      end
    end

    # Allow the provider to declare that it has a given feature.
    @feature_module.send(:define_method, :has_features) do |*names|
      @declared_features ||= []
      names.each do |name|
        @declared_features << name.intern
      end
    end
    # Aaah, grammatical correctness
    @feature_module.send(:alias_method, :has_feature, :has_features)
  end
  @feature_module
end