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# Copyright (C) 2015-2017 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
class Collection
class View
module Builder
# Provides behaviour for mapping modifiers.
#
# @since 2.2.0
module Modifiers
extend self
# Mappings from driver options to legacy server values.
#
# @since 2.2.0
DRIVER_MAPPINGS = BSON::Document.new(
sort: '$orderby',
hint: '$hint',
comment: '$comment',
snapshot: '$snapshot',
max_scan: '$maxScan',
max_value: '$max',
min_value: '$min',
max_time_ms: '$maxTimeMS',
return_key: '$returnKey',
show_disk_loc: '$showDiskLoc',
explain: '$explain'
).freeze
# Mappings from server values to driver options.
#
# @since 2.2.0
SERVER_MAPPINGS = BSON::Document.new(DRIVER_MAPPINGS.invert).freeze
# Transform the provided server modifiers to driver options.
#
# @example Transform to driver options.
# Modifiers.map_driver_options(modifiers)
#
# @param [ Hash ] modifiers The modifiers.
#
# @return [ BSON::Document ] The driver options.
#
# @since 2.2.0
def self.map_driver_options(modifiers)
Options::Mapper.transform_documents(modifiers, SERVER_MAPPINGS)
end
# Transform the provided options into a document of only server
# modifiers.
#
# @example Map the server modifiers.
# Modifiers.map_server_modifiers(options)
#
# @param [ Hash, BSON::Document ] options The options.
#
# @return [ BSON::Document ] The modifiers.
#
# @since 2.2.0
def self.map_server_modifiers(options)
Options::Mapper.transform_documents(options, DRIVER_MAPPINGS)
end
end
end
end
end
end
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