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# frozen_string_literal: true
module Gem::Molinillo
class DependencyGraph
# An action that modifies a {DependencyGraph} that is reversible.
# @abstract
class Action
# rubocop:disable Lint/UnusedMethodArgument
# @return [Symbol] The name of the action.
def self.action_name
raise 'Abstract'
end
# Performs the action on the given graph.
# @param [DependencyGraph] graph the graph to perform the action on.
# @return [Void]
def up(graph)
raise 'Abstract'
end
# Reverses the action on the given graph.
# @param [DependencyGraph] graph the graph to reverse the action on.
# @return [Void]
def down(graph)
raise 'Abstract'
end
# @return [Action,Nil] The previous action
attr_accessor :previous
# @return [Action,Nil] The next action
attr_accessor :next
end
end
end
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