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name : best_set.rb
 # frozen_string_literal: true
##
# The BestSet chooses the best available method to query a remote index.
#
# It combines IndexSet and APISet

class Gem::Resolver::BestSet < Gem::Resolver::ComposedSet

  ##
  # Creates a BestSet for the given +sources+ or Gem::sources if none are
  # specified.  +sources+ must be a Gem::SourceList.

  def initialize(sources = Gem.sources)
    super()

    @sources = sources
  end

  ##
  # Picks which sets to use for the configured sources.

  def pick_sets # :nodoc:
    @sources.each_source do |source|
      @sets << source.dependency_resolver_set
    end
  end

  def find_all(req) # :nodoc:
    pick_sets if @remote and @sets.empty?

    super
  rescue Gem::RemoteFetcher::FetchError => e
    replace_failed_api_set e

    retry
  end

  def prefetch(reqs) # :nodoc:
    pick_sets if @remote and @sets.empty?

    super
  end

  def pretty_print(q) # :nodoc:
    q.group 2, '[BestSet', ']' do
      q.breakable
      q.text 'sets:'

      q.breakable
      q.pp @sets
    end
  end

  ##
  # Replaces a failed APISet for the URI in +error+ with an IndexSet.
  #
  # If no matching APISet can be found the original +error+ is raised.
  #
  # The calling method must retry the exception to repeat the lookup.

  def replace_failed_api_set(error) # :nodoc:
    uri = error.uri
    uri = URI uri unless URI === uri
    uri.query = nil

    raise error unless api_set = @sets.find do |set|
      Gem::Resolver::APISet === set and set.dep_uri == uri
    end

    index_set = Gem::Resolver::IndexSet.new api_set.source

    @sets.map! do |set|
      next set unless set == api_set
      index_set
    end
  end

end
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