class Gem::Resolver::Specification

def download(options)
  dir = options[:install_dir] || Gem.dir
  Gem.ensure_gem_subdirectories dir
  source.download spec, dir
end

def fetch_development_dependencies # :nodoc:
end

def full_name
  "#{@name}-#{@version}"
end

def initialize
  @dependencies = nil
  @name         = nil
  @platform     = nil
  @set          = nil
  @source       = nil
  @version      = nil
  @required_ruby_version = Gem::Requirement.default
  @required_rubygems_version = Gem::Requirement.default
end

def install(options = {})
  require_relative "../installer"
  gem = download options
  installer = Gem::Installer.at gem, options
  yield installer if block_given?
  @spec = installer.install
end

def installable_platform?
  Gem::Platform.match_spec? spec
end

def local? # :nodoc:
  false
end