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class Chef
class Decorator < SimpleDelegator
#
# This decorator unchains method call chains and turns them into method calls
# with variable args. So this:
#
# node.set_unless["foo"]["bar"] = "baz"
#
# Can become:
#
# node.set_unless("foo", "bar", "baz")
#
# While this is a decorator it is not a Decorator and does not inherit because
# it deliberately does not need or want the method_missing magic. It is not legal
# to call anything on the intermediate values and only supports method chaining with
# #[] until the chain comes to an end with #[]=, so does not behave like a hash or
# array... e.g.
#
# node.default['foo'].keys is legal
# node.set_unless['foo'].keys is not legal now or ever
#
class Unchain
attr_accessor :__path__
attr_accessor :__method__
def initialize(obj, method)
@__path__ = []
@__method__ = method
@delegate_sd_obj = obj
end
def [](key)
__path__.push(key)
self
end
def []=(key, value)
__path__.push(key)
@delegate_sd_obj.public_send(__method__, *__path__, value)
end
# unfortunately we have to support method_missing for node.set_unless.foo.bar = 'baz' notation
def method_missing(symbol, *args)
if symbol == :to_ary
merged_attributes.send(symbol, *args)
elsif args.empty?
Chef.log_deprecation %q{"method access to node attributes (node.foo.bar) is deprecated and will be removed in Chef 13, please use bracket syntax (node["foo"]["bar"])}
self[symbol]
elsif symbol.to_s =~ /=$/
Chef.log_deprecation %q{"method setting of node attributes (node.foo="bar") is deprecated and will be removed in Chef 13, please use bracket syntax (node["foo"]="bar")}
key_to_set = symbol.to_s[/^(.+)=$/, 1]
self[key_to_set] = (args.length == 1 ? args[0] : args)
else
raise NoMethodError, "Undefined node attribute or method `#{symbol}' on `node'"
end
end
end
end
end
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