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Contents
module Rubydora
# Copied in part from projectblacklight.org
module ExtensionParameters
# setup extension support
def self.included(base)
base.extend ExtendableClassMethods
base.class_eval do
# Provide a class-level hash for extension parameters
# @return [Hash]
def self.extension_parameters
## This variable should NOT be @@, since we're in a class method,
# it's just @ to be a class variable. Confusing, but it
# passes the tests this way.
@extension_parameters ||= {}
end
end
base.after_initialize do
apply_extensions
end
end
# try to apply registered extensions
def apply_extensions
self.class.registered_extensions.each do |registration|
self.extend( registration[:module_obj] ) if registration[:condition_proc].nil? || registration[:condition_proc].call( self )
end
end
# Certain class-level modules needed for the document-specific
# extendability architecture
module ExtendableClassMethods
attr_writer :registered_extensions
# registered_extensions accessor
# @return [Array]
def registered_extensions
@registered_extensions ||= []
end
# register extensions
# @param [Module] module_obj
# @yield &condition
def use_extension( module_obj, &condition )
registered_extensions << {:module_obj => module_obj, :condition_proc => condition}
end
end
end
end
Version data entries
39 entries across 39 versions & 1 rubygems