module Scrivito

#
# This class represents a collection of attribute definitions.
#
# @api public
#
class AttributeDefinitionCollection
  include Enumerable

  # Compatibility for Object#blank?
  delegate :empty?, to: :attribute_definitions

  def initialize(attribute_definitions)
    @attribute_definitions = attribute_definitions
  end

  #
  # Iterates over the attribute definitions.
  #
  # @api public
  # @yieldparam [Scrivito:AttributeDefinition] attribute_definition
  #
  def each(&block)
    attribute_definitions.values.each(&block)
  end

  #
  # Find definition of an attribute.
  #
  # @api public
  # @param name [Symbol, String] the name of the attribute.
  # @return [Scrivito::AttributeDefinition, nil] attribute definition if found or +nil+ otherwise.
  #
  def [](name)
    attribute_definitions[name.to_s]
  end

  private

  attr_reader :attribute_definitions
end

end