impact_model.rb

Copyright © 2010 Brighter Planet. See LICENSE for details. Contact Brighter Planet for dual-license arrangements.

 
module BrighterPlanet
  module FuelPurchase
    module ImpactModel
      def self.included(base)
        base.decide :impact, :with => :characteristics do
          committee :carbon do
            quorum 'from volume and emission factor', :needs => [:volume, :emission_factor] do |characteristics|

variable units variable units FIXME TODO should we make volumes energy contents to avoid unit mismatches?

 
              characteristics[:volume] * characteristics[:emission_factor]
            end
            
            quorum 'default' do
              raise "The fuel purchase's default emission quorum should never be called"
            end
          end
          
          committee :emission_factor do # FIXME TODO add date-based lookup once we have timeseries of emission factors
            quorum 'from fuel type', :needs => :fuel_type do |characteristics|
              characteristics[:fuel_type].emission_factor
            end
            
            quorum 'default' do
              FuelType.fallback.emission_factor
            end
          end
          
          committee :volume do
            quorum 'from cost and price', :needs => [:cost, :price] do |characteristics|

dollars dollars / variable unit FIXME TODO should we make prices $ / kJ to avoid unit mismatches?

 
              characteristics[:cost] / characteristics[:price]
            end
            
            quorum 'from fuel type', :needs => :fuel_type do |characteristics|

variable units

 
              characteristics[:fuel_type].average_purchase_volume
            end
            
            quorum 'default' do # FIXME TODO get rid of this if we ever make a fallback fuel_type

variable units

 
              FuelType.fallback.average_purchase_volume
            end
          end
          
          committee :price do

FIXME TODO fill in location- and date-based quorums quorum :from_fuel_type_and_state_and_date, :needs => [:fuel_type, :state, :date] do |characteristics, timeframe| end

quorum :from_fuel_type_and_petroleum_administration_for_defense_district_and_date, :needs => [:fuel_type, :petroleum_administration_for_defense_district, :date] do |characteristics, timeframe| end

quorum :from_fuel_type_and_state, :needs => [:fuel_type, :state] do |characteristics, timeframe| end

quorum :from_fuel_type_and_petroleum_administration_for_defense_district, :needs => [:fuel_type, :petroleum_administration_for_defense_district] do |characteristics, timeframe| end

quorum :from_fuel_type_and_date, :needs [:fuel_type, :date] do |characteristics, timeframe| end

 
            quorum 'from fuel type', :needs => :fuel_type do |characteristics|

dollars / variable unit

 
              characteristics[:fuel_type].price
            end
          end
          
          committee :petroleum_administration_for_defense_district do
            quorum 'from state', :needs => :state do |characteristics|
              characteristics[:state].petroleum_administration_for_defense_district
            end
          end
          
          committee :state do
            quorum 'from zip code', :needs => :zip_code do |characteristics|
              characteristics[:zip_code].state
            end
          end

FIXME TODO should this be only user-supplied, or should we specify a fallback? committee :fuel_type do |characteristics, timeframe| FuelType.fallback.fuel_type end

 
        end
      end
    end
  end
end