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module Stamina
#
# Allows any object to be markable with user-data.
#
# This module is expected to be included by classes that want to implement the
# Markable design pattern. Moreover, if the instances of the including class
# respond to <tt>state_changed</tt>, this method is automatically invoked when
# marks change. This method is used by <tt>automaton</tt> in order to make it
# possible to track changes and check modified automata for consistency.
#
# == Detailed API
module Markable
#
# Returns user-value associated to _key_, nil if no such key in user-data.
#
def [](key) @data[key] end
#
# Associates _value_ to _key_ in user-data. Overrides previous value if
# present.
#
def []=(key,value)
oldvalue = @data[key]
@data[key] = value
state_changed(:loaded_pair, [key,oldvalue,value]) if self.respond_to? :state_changed
end
# Removes a mark
def remove_mark(key)
oldvalue = @data[key]
@data.delete(key)
state_changed(:loaded_pair, [key,oldvalue,nil]) if self.respond_to? :state_changed
end
# Extracts the copy of attributes which can subsequently be modified.
def data
@data.nil? ? {} : @data.dup
end
end # module Markable
end # module Stamina
Version data entries
5 entries across 5 versions & 1 rubygems