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# frozen_string_literal: true
##
# Specifies a Specification object that should be activated.  Also contains a
# dependency that was used to introduce this activation.

class Gem::Resolver::ActivationRequest

  ##
  # The parent request for this activation request.

  attr_reader :request

  ##
  # The specification to be activated.

  attr_reader :spec

  ##
  # Creates a new ActivationRequest that will activate +spec+.  The parent
  # +request+ is used to provide diagnostics in case of conflicts.
  #
  # +others_possible+ indicates that other specifications may also match this
  # activation request.

  def initialize spec, request, others_possible = true
    @spec = spec
    @request = request
    @others_possible = others_possible
  end

  def == other # :nodoc:
    case other
    when Gem::Specification
      @spec == other
    when Gem::Resolver::ActivationRequest
      @spec == other.spec && @request == other.request
    else
      false
    end
  end

  ##
  # Is this activation request for a development dependency?

  def development?
    @request.development?
  end

  ##
  # Downloads a gem at +path+ and returns the file path.

  def download path
    Gem.ensure_gem_subdirectories path

    if @spec.respond_to? :sources
      exception = nil
      path = @spec.sources.find{ |source|
        begin
          source.download full_spec, path
        rescue exception
        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.

  def full_name
    @spec.full_name
  end

  alias_method :to_s, :full_name

  ##
  # The Gem::Specification for this activation request.

  def full_spec
    Gem::Specification === @spec ? @spec : @spec.spec
  end

  def inspect # :nodoc:
    others =
      case @others_possible
      when true then # TODO remove at RubyGems 3
        ' (others possible)'
      when false then # TODO remove at RubyGems 3
        nil
      else
        unless @others_possible.empty? then
          others = @others_possible.map { |s| s.full_name }
          " (others possible: #{others.join ', '})"
        end
      end

    '#<%s for %p from %s%s>' % [
      self.class, @spec, @request, others
    ]
  end

  ##
  # True if the requested gem has already been installed.

  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

  def name
    @spec.name
  end

  ##
  # Indicate if this activation is one of a set of possible
  # requests for the same Dependency request.

  def others_possible?
    case @others_possible
    when true, false then
      @others_possible
    else
      not @others_possible.empty?
    end
  end

  ##
  # Return the ActivationRequest that contained the dependency
  # that we were activated for.

  def parent
    @request.requester
  end

  def pretty_print q # :nodoc:
    q.group 2, '[Activation request', ']' do
      q.breakable
      q.pp @spec

      q.breakable
      q.text ' for '
      q.pp @request

      case @others_possible
      when false then
      when true then
        q.breakable
        q.text 'others possible'
      else
        unless @others_possible.empty? then
          q.breakable
          q.text 'others '
          q.pp @others_possible.map { |s| s.full_name }
        end
      end
    end
  end

  ##
  # The version of this activation request's specification

  def version
    @spec.version
  end

end