Add schedule capabilities to a resource

gistfile1.rb

require 'ice_cube'
require 'active_support/all'

include IceCube

class Resource
  
  attr_accessor :availability

  def available_since(t = nil)
    @available_since = t if t
    @available_since ||= Time.now.beginning_of_year
  end

  def always_available!
    @availability = Schedule.new(available_since, :duration => 1.day)
    @availability.add_recurrence_rule(Rule.daily.until(Time.now.end_of_year))
  end
  
  def schedules
    @schedules ||= []
  end

  def available?(time = Time.now)
    return true if schedules.empty?
    availability.occurring_at?(time) && !schedules.any? {|s| s.occurring_at?(time) }
  end

  def weekly_occupied_on(day, hour, minute, options = {})
    sc = Schedule.new(available_since + hour.hours + minute.minutes, options)
    sc.add_recurrence_rule(Rule.weekly.day(day).until(Time.now.end_of_year))
    schedules << sc
  end

  def allocations
    schedules.map(&:all_occurrences).flatten
  end
  
end

cls = Resource.new
cls.always_available!
cls.weekly_occupied_on(:monday, 13, 30, :duration => 2.hours)
puts cls.allocations
t = Time.new(2010, 10, 4, 15, 31, 0)
puts t
puts cls.available?(t)