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Contents
# frozen_string_literal: true
module Gamefic
# An array wrapper that exposes a protected interface. The array is always
# returned frozen. It can only be modified through #add and #delete. The
# vault can be "locked" to prevent existing elements from being deleted.
#
class Vault
def initialize
@set = Set.new
@array = []
@lock_index = nil
end
# @return [Array]
def array
@array.freeze
end
# @param object [Object]
def add object
@array = @set.add(object).to_a
object
end
# @param object [Object]
# @return [Boolean] True if object was deleted
def delete object
return false unless deletable?(object) && @set.delete?(object)
@array = @set.to_a.freeze
true
end
# Lock the current elements in the vault.
#
# After the vault is locked, calling #delete on a locked element will leave
# the element in the array and return false. Elements added after the lock
# can be deleted.
#
def lock
return @lock_index if @lock_index
@lock_index = @array.length
end
# @return [Boolean] True if the object is deletable (i.e., not locked).
def deletable? object
@lock_index.to_i <= @array.find_index(object).to_i
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems