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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 legacy OP_QUERY specification from options.
#
# @since 2.2.0
class OpQuery
extend Forwardable
def_delegators :@view, :cluster, :collection, :database, :filter, :options, :read
# @return [ BSON::Document ] modifiers The server modifiers.
attr_reader :modifiers
# Create the new legacy query builder.
#
# @example Create the query builder.
# QueryBuilder.new(view)
#
# @param [ Collection::View ] view The collection view.
#
# @since 2.2.2
def initialize(view)
@view = view
@modifiers = Modifiers.map_server_modifiers(options)
end
def specification
{
:selector => requires_special_filter? ? special_filter : filter,
:read => read,
:options => query_options,
:db_name => database.name,
:coll_name => collection.name
}
end
private
def query_options
BSON::Document.new(
project: options[:projection],
skip: options[:skip],
limit: options[:limit],
flags: Flags.map_flags(options),
batch_size: options[:batch_size]
)
end
def requires_special_filter?
!modifiers.empty? || cluster.sharded?
end
def read_pref_formatted
@read_formatted ||= ServerSelector.get(read).to_mongos if read
end
def special_filter
sel = BSON::Document.new(:$query => filter).merge!(modifiers)
sel[:$readPreference] = read_pref_formatted unless read_pref_formatted.nil?
sel
end
end
end
end
end
end
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