class Rails::Generators::Base

def class_collisions(*class_names) #:nodoc:
  return unless behavior == :invoke
  class_names.flatten.each do |class_name|
    class_name = class_name.to_s
    next if class_name.strip.empty?
    # Split the class from its module nesting
    nesting = class_name.split('::')
    last_name = nesting.pop
    # Hack to limit const_defined? to non-inherited on 1.9
    extra = []
    extra << false unless Object.method(:const_defined?).arity == 1
    # Extract the last Module in the nesting
    last = nesting.inject(Object) do |last, nest|
      break unless last.const_defined?(nest, *extra)
      last.const_get(nest)
    end
    if last && last.const_defined?(last_name.camelize, *extra)
      raise Error, "The name '#{class_name}' is either already used in your application " <<
                   "or reserved by Ruby on Rails. Please choose an alternative and run "  <<
                   "this generator again."
    end
  end
end