class Bundler::Definition

def resolve
  @resolve ||= if Bundler.frozen_bundle?
    Bundler.ui.debug "Frozen, using resolution from the lockfile"
    @locked_specs
  elsif no_resolve_needed?
    if deleted_deps.any?
      Bundler.ui.debug "Some dependencies were deleted, using a subset of the resolution from the lockfile"
      SpecSet.new(filter_specs(@locked_specs, @dependencies - deleted_deps))
    else
      Bundler.ui.debug "Found no changes, using resolution from the lockfile"
      if @removed_platform || @locked_gems.may_include_redundant_platform_specific_gems?
        SpecSet.new(filter_specs(@locked_specs, @dependencies))
      else
        @locked_specs
      end
    end
  else
    if lockfile_exists?
      Bundler.ui.debug "Found changes from the lockfile, re-resolving dependencies because #{change_reason}"
    else
      Bundler.ui.debug "Resolving dependencies because there's no lockfile"
    end
    start_resolution
  end
end