Module: Equalshares::TieBreaker

Defined in:
lib/equalshares/tie_breaker.rb

Overview

Tie-breaking strategies. Each element of params.tie_breaking maps to one strategy object (via TieBreaker.for). A strategy can either narrow a tied set (#filter, used to resolve a single tie in priority order) or contribute a sort key (#sort_key, used to build a total order over all projects). Mirrors pabutools' TieBreakingRule.

Defined Under Namespace

Classes: Context, ExplicitList, Extreme, Lexico, MaxCost, MaxVotes, MinCost

Class Method Summary collapse

Class Method Details

.for(method) ⇒ Object 



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# File 'lib/equalshares/tie_breaker.rb', line 14

def for(method)
  case method
  when "maxVotes" then MaxVotes.new
  when "minCost" then MinCost.new
  when "maxCost" then MaxCost.new
  when Hash then Lexico.new(lexico_order(method))
  when Array then ExplicitList.new(method)
  else
    raise ComputeError, "Unknown tie-breaking method: #{method}"
  end
end

.lexico_order(method) ⇒ Object

Raises:



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# File 'lib/equalshares/tie_breaker.rb', line 26

def lexico_order(method)
  order = method[:lexico] || method["lexico"]
  raise ComputeError, "Unknown tie-breaking method: #{method}" unless order.is_a?(Array)

  order
end