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# Copyright (C) 2015 MongoDB, Inc.
#
# 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 Mongo
module Options
# Utility class for various options mapping behaviour.
#
# @since 2.0.0
module Mapper
extend self
# Transforms the provided options to a new set of options given the
# provided mapping.
#
# @example Transform the options.
# Mapper.transform({ name: 1 }, { :name => :nombre })
#
# @param [ Hash ] options The options to transform
# @param [ Hash ] mappings The key mappings.
#
# @return [ Hash ] The transformed options.
#
# @since 2.0.0
def transform(options, mappings)
map = transform_keys_to_strings(mappings)
opts = transform_keys_to_strings(options)
opts.reduce({}) do |transformed, (key, value)|
transformed[map[key]] = value if map[key]
transformed
end
end
# Transforms the provided options to a new set of options given the
# provided mapping. Expects BSON::Documents in and out so no explicit
# string conversion needs to happen.
#
# @example Transform the options.
# Mapper.transform_documents({ name: 1 }, { :name => :nombre })
#
# @param [ BSON::Document ] options The options to transform
# @param [ BSON::Document ] mappings The key mappings.
# @param [ BSON::Document ] document The output document.
#
# @return [ BSON::Document ] The transformed options.
#
# @since 2.0.0
def transform_documents(options, mappings, document = BSON::Document.new)
options.reduce(document) do |transformed, (key, value)|
name = mappings[key]
transformed[name] = value if name && !value.nil?
transformed
end
end
# Coverts all the keys of the options to strings.
#
# @example Convert all option keys to strings.
# Mapper.transform({ :name => 1 })
#
# @param [ Hash ] options The options to transform.
#
# @return [ Hash ] The transformed options.
#
# @since 2.0.0
def transform_keys_to_strings(options)
options.reduce({}) do |transformed, (key, value)|
transformed[key.to_s] = value
transformed
end
end
# Coverts all the keys of the options to symbols.
#
# @example Convert all option keys to symbols.
# Mapper.transform({ 'name' => 1 })
#
# @param [ Hash ] options The options to transform.
#
# @return [ Hash ] The transformed options.
#
# @since 2.2.2
def transform_keys_to_symbols(options)
options.reduce({}) do |transformed, (key, value)|
transformed[key.to_sym] = value
transformed
end
end
# Coverts all the symbol values to strings.
#
# @example Convert all option symbol values to strings.
# Mapper.transform({ :name => 1 })
#
# @param [ Hash ] options The options to transform.
#
# @return [ Hash ] The transformed options.
#
# @since 2.0.0
def transform_values_to_strings(options)
options.reduce({}) do |transformed, (key, value)|
transformed[key] = value.is_a?(Symbol) ? value.to_s : value
transformed
end
end
end
end
end
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