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Contents
module NxtStateMachine
class State
include Comparable
def initialize(enum, state_machine, **opts)
@enum = enum
@state_machine = state_machine
@initial = opts.delete(:initial)
@transitions = []
@options = opts.with_indifferent_access
@index = opts.fetch(:index)
ensure_index_not_occupied
end
attr_accessor :enum, :initial, :index, :transitions, :state_machine, :options
def to_s
enum.to_s
end
def previous
current_index = sorted_states.index { |state| state.index == index }
sorted_states[(current_index - 1) % sorted_states.size]
end
def next
current_index = sorted_states.index { |state| state.index == index }
sorted_states[(current_index + 1) % sorted_states.size]
end
def last?
sorted_states.last.index == index
end
def first?
sorted_states.first.index == index
end
def events
state_machine.events_for_state(enum)
end
def <=>(other)
index <=> other.index
end
private
def sorted_states
state_machine.states.values.sort_by(&:index)
end
def ensure_index_not_occupied
state_with_same_index = state_machine.states.values.find { |state| state.index == index }
return unless state_with_same_index
raise StateWithSameIndexAlreadyRegistered, "The index #{index} is already occupied by state: #{state_with_same_index.enum}"
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems