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#
# Author:: John Keiser (<jkeiser@opscode.com>)
# Copyright:: Copyright (c) 2013 Opscode, 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
def initialize(symbol)
@symbol = symbol
@default = nil
@has_default = false
@default_value = nil
@writes_value = nil
end
def defaults_to(default_value = nil, &block)
@has_default = true
@default = block
@default_value = default_value
self
end
def writes_value(&block)
@writes_value = block
self
end
def get(config)
if config.has_key?(@symbol)
config[@symbol]
elsif @default
@default.call
elsif @default_value.is_a?(::Mixlib::Config)
# Don't dup config_contexts
@default_value
else
begin
# Some things cannot be dup'd, and you won't know this till after the fact
# because all values implement dup
config[@symbol] = @default_value.dup
rescue TypeError
@default_value
end
end
end
def set(config, value)
config[@symbol] = @writes_value ? @writes_value.call(value) : value
end
# Sets the saved value into the result hash. Don't bother stashing defaults away or duping them.
def save(config, result, include_defaults)
if config.has_key?(@symbol)
result[@symbol] = config[@symbol]
elsif @default_value.is_a?(::Mixlib::Config)
saved_context = @default_value.save(include_defaults)
if saved_context != {} || include_defaults
result[@symbol] = saved_context
end
elsif include_defaults && @has_default
if @default
result[@symbol] = @default.call
else
result[@symbol] = @default_value
end
end
end
end
end
end
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