class Event::NameResolver

Resolve name to Event name

Public Class Methods

new(default_namespace) click to toggle source
# File lib/event/name_resolver.rb, line 7
def initialize(default_namespace)
  @default_namespace = default_namespace
end

Public Instance Methods

transform(event_id) click to toggle source
# File lib/event/name_resolver.rb, line 11
def transform(event_id)
  case event_id
  when Class
    event_id
  when String
    constantize(event_id)
  else
    constantize("#{@default_namespace}::#{camel_case(event_id)}")
  end
rescue => e
  raise EventNameResolveError, %Q(Transforming "#{event_id}" into an event class failed: #{e.message}.\n\n#{e.backtrace.join("\n")})
end

Private Instance Methods

camel_case(underscored_name) click to toggle source
# File lib/event/name_resolver.rb, line 26
def camel_case(underscored_name)
  if RUBY_VERSION < '1.9.3'
    underscored_name.to_s.split('_').map { |word| word.upcase.chars.to_a[0] + word.chars.to_a[1..-1].join }.join
  else
    underscored_name.to_s.split('_').map { |word| word.upcase[0] + word[1..-1] }.join
  end
end
constantize(camel_cased_word) click to toggle source

Thanks ActiveSupport (Only needed to support Ruby 1.9.3 and JRuby)

# File lib/event/name_resolver.rb, line 36
def constantize(camel_cased_word)
  names = camel_cased_word.split('::')

  # Trigger a built-in NameError exception including the ill-formed constant in the message.
  Object.const_get(camel_cased_word) if names.empty?

  # Remove the first blank element in case of '::ClassName' notation.
  names.shift if names.size > 1 && names.first.empty?

  names.inject(Object) do |constant, name|
    if constant == Object
      constant.const_get(name)
    else
      candidate = constant.const_get(name)

      if RUBY_VERSION < '1.9.3'
        next candidate if constant.const_defined?(name)
      else
        next candidate if constant.const_defined?(name, false)
      end

      next candidate unless Object.const_defined?(name)

      # Go down the ancestors to check if it is owned directly. The check
      # stops when we reach Object or the end of ancestors tree.
      # rubocop:disable Style/EachWithObject
      constant = constant.ancestors.inject do |const, ancestor|
        break const    if ancestor == Object
        break ancestor if ancestor.const_defined?(name, false)
        const
      end
      # rubocop:enable Style/EachWithObject

      # owner is in Object, so raise
      constant.const_get(name, false)
    end
  end
end