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#--
# Copyright:: Copyright (c) Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require "delegate"
require_relative "constants"
class Chef
class Decorator < SimpleDelegator
def initialize(obj = NOT_PASSED)
@__defined_methods__ = []
super unless obj.equal?(NOT_PASSED)
end
# if we wrap a nil then decorator.nil? should be true
def nil?
__getobj__.nil?
end
# if we wrap a Hash then decorator.is_a?(Hash) should be true
def is_a?(klass)
__getobj__.is_a?(klass) || super
end
# if we wrap a Hash then decorator.kind_of?(Hash) should be true
def kind_of?(klass)
__getobj__.is_a?(klass) || super
end
# reset our methods on the instance if the object changes under us (this also
# clears out the closure over the target we create in method_missing below)
def __setobj__(obj)
__reset_methods__
super
end
# this is the ruby 2.2/2.3 implementation of Delegator#method_missing() with
# adding the define_singleton_method call and @__defined_methods__ tracking
def method_missing(m, *args, &block)
r = true
target = __getobj__ { r = false }
if r && target.respond_to?(m)
# these next 4 lines are the patched code
define_singleton_method(m) do |*args, &block|
target.__send__(m, *args, &block)
end
@__defined_methods__.push(m)
target.__send__(m, *args, &block)
elsif ::Kernel.respond_to?(m, true)
::Kernel.instance_method(m).bind(self).call(*args, &block)
else
super(m, *args, &block)
end
end
private
# used by __setobj__ to clear the methods we've built on the instance.
def __reset_methods__
@__defined_methods__.each do |m|
singleton_class.send(:undef_method, m)
end
@__defined_methods__ = []
end
end
end
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