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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
# Builds a find command specification from options.
#
# @since 2.2.0
class FindCommand
extend Forwardable
# The mappings from ruby options to the find command.
#
# @since 2.2.0
MAPPINGS = BSON::Document.new(
sort: 'sort',
projection: 'projection',
hint: 'hint',
skip: 'skip',
limit: 'limit',
batch_size: 'batchSize',
single_batch: 'singleBatch',
comment: 'comment',
max_scan: 'maxScan',
max_time_ms: 'maxTimeMS',
max_value: 'max',
min_value: 'min',
return_key: 'returnKey',
show_disk_loc: 'showRecordId',
snapshot: 'snapshot',
tailable: 'tailable',
tailable_cursor: 'tailable',
oplog_replay: 'oplogReplay',
no_cursor_timeout: 'noCursorTimeout',
await_data: 'awaitData',
allow_partial_results: 'allowPartialResults',
collation: 'collation'
).freeze
def_delegators :@view, :collection, :database, :filter, :options, :read
# Get the specification for an explain command that wraps the find
# command.
#
# @example Get the explain spec.
# builder.explain_specification
#
# @return [ Hash ] The specification.
#
# @since 2.2.0
def explain_specification
{ selector: { explain: find_command }, db_name: database.name, read: read, session: @session }
end
# Create the find command builder.
#
# @example Create the find command builder.
# FindCommandBuilder.new(view)
#
# @param [ Collection::View ] view The collection view.
# @param [ Session ] session The session.
#
# @since 2.2.2
def initialize(view, session)
@view = view
@session = session
end
# Get the specification to pass to the find command operation.
#
# @example Get the specification.
# builder.specification
#
# @return [ Hash ] The specification.
#
# @since 2.2.0
def specification
{ selector: find_command, db_name: database.name, read: read, session: @session }
end
private
def find_command
document = BSON::Document.new('find' => collection.name, 'filter' => filter)
document[:readConcern] = collection.read_concern if collection.read_concern
command = Options::Mapper.transform_documents(convert_flags(options), MAPPINGS, document)
convert_limit_and_batch_size(command)
command
end
def convert_limit_and_batch_size(command)
if command[:limit] && command[:limit] < 0 &&
command[:batchSize] && command[:batchSize] < 0
command[:limit] = command[:limit].abs
command[:batchSize] = command[:limit].abs
command[:singleBatch] = true
else
[:limit, :batchSize].each do |opt|
if command[opt]
if command[opt] < 0
command[opt] = command[opt].abs
command[:singleBatch] = true
elsif command[opt] == 0
command.delete(opt)
end
end
end
end
end
def convert_flags(options)
return options if options.empty?
opts = options.dup
opts.delete(:cursor_type)
Flags.map_flags(options).reduce(opts) do |o, key|
o.merge!(key => true)
end
end
end
end
end
end
end
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