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#
# Author:: John Keiser (<jkeiser@chef.io>)
# Copyright:: Copyright (c) 2013-2018, 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.
#
module Mixlib
module Config
class Configurable
attr_reader :symbol
attr_reader :default_value
attr_reader :default_block
def initialize(symbol)
@symbol = symbol
end
def has_default?
instance_variable_defined?(:@default_value)
end
def writes_value?
instance_variable_defined?(:@writes_value)
end
def default_block?
instance_variable_defined?(:@default_block)
end
alias_method :has_default, :has_default?
def defaults_to(default_value = nil, &block)
@default_value = default_value
@default_block = block if block_given?
self
end
def writes_value(&block)
@writes_value = block
self
end
def get(config)
if config.key?(symbol)
config[symbol]
elsif default_block?
default_block.call
else
config[symbol] = safe_dup(default_value)
end
end
def set(config, value)
config[symbol] = writes_value? ? @writes_value.call(value) : value
end
def default
if default_block?
default_block.call
else
default_value
end
end
def is_default?(config)
!config.key?(symbol) || config[symbol] == default_value
end
private
def safe_dup(e)
e.dup
rescue TypeError
e
end
end
end
end
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