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##
# A Resolver::Specification contains a subset of the information
# contained in a Gem::Specification. Only the information necessary for
# dependency resolution in the resolver is included.
class Gem::Resolver::Specification
##
# The dependencies of the gem for this specification
attr_reader :dependencies
##
# The name of the gem for this specification
attr_reader :name
##
# The platform this gem works on.
attr_reader :platform
##
# The set this specification came from.
attr_reader :set
##
# The source for this specification
attr_reader :source
##
# The Gem::Specification for this Resolver::Specification.
#
# Implementers, note that #install updates @spec, so be sure to cache the
# Gem::Specification in @spec when overriding.
attr_reader :spec
##
# The version of the gem for this specification.
attr_reader :version
##
# Sets default instance variables for the specification.
def initialize
@dependencies = nil
@name = nil
@platform = nil
@set = nil
@source = nil
@version = nil
end
##
# Fetches development dependencies if the source does not provide them by
# default (see APISpecification).
def fetch_development_dependencies # :nodoc:
end
##
# The name and version of the specification.
#
# Unlike Gem::Specification#full_name, the platform is not included.
def full_name
"#{@name}-#{@version}"
end
##
# Installs this specification using the Gem::Installer +options+. The
# install method yields a Gem::Installer instance, which indicates the
# gem will be installed, or +nil+, which indicates the gem is already
# installed.
#
# After installation #spec is updated to point to the just-installed
# specification.
def install options = {}
require 'rubygems/installer'
destination = options[:install_dir] || Gem.dir
Gem.ensure_gem_subdirectories destination
gem = source.download spec, destination
installer = Gem::Installer.new gem, options
yield installer if block_given?
@spec = installer.install
end
##
# Returns true if this specification is installable on this platform.
def installable_platform?
Gem::Platform.match spec.platform
end
def local? # :nodoc:
false
end
end
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