Specifies a Specification object that should be activated. Also contains a dependency that was used to introduce this activation.
Creates a new ActivationRequest that will activate spec.  The parent request is used to provide diagnostics in case of conflicts.
 
               # File rubygems/resolver/activation_request.rb, line 22
def initialize(spec, request)
  @spec = spec
  @request = request
end
             
            Is this activation request for a development dependency?
 
               # File rubygems/resolver/activation_request.rb, line 41
def development?
  @request.development?
end
             
            Downloads a gem at path and returns the file path.
 
               # File rubygems/resolver/activation_request.rb, line 48
def download(path)
  Gem.ensure_gem_subdirectories path
  if @spec.respond_to? :sources
    exception = nil
    path = @spec.sources.find do |source|
      begin
        source.download full_spec, path
      rescue exception
      end
    end
    return path      if path
    raise  exception if exception
  elsif @spec.respond_to? :source
    source = @spec.source
    source.download full_spec, path
  else
    source = Gem.sources.first
    source.download full_spec, path
  end
end
             
            The full name of the specification to be activated.
 
               # File rubygems/resolver/activation_request.rb, line 75
def full_name
  name_tuple.full_name
end
             
            The Gem::Specification for this activation request.
 
               # File rubygems/resolver/activation_request.rb, line 84
def full_spec
  Gem::Specification === @spec ? @spec : @spec.spec
end
             
            True if the requested gem has already been installed.
 
               # File rubygems/resolver/activation_request.rb, line 97
def installed?
  case @spec
  when Gem::Resolver::VendorSpecification then
    true
  else
    this_spec = full_spec
    Gem::Specification.any? do |s|
      s == this_spec
    end
  end
end
             
            The name of this activation request's specification
 
               # File rubygems/resolver/activation_request.rb, line 113
def name
  @spec.name
end
             
            Return the ActivationRequest that contained the dependency that we were activated for.
 
               # File rubygems/resolver/activation_request.rb, line 121
def parent
  @request.requester
end