mongo-ruby-driver/lib/mongo/message/query_message.rb

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# --
# Copyright (C) 2008-2009 10gen 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.
# ++
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require 'mongo/message/message'
require 'mongo/message/opcodes'
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require 'mongo/util/conversions'
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require 'mongo/util/ordered_hash'
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module Mongo
class QueryMessage < Message
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include Mongo::Conversions
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attr_reader :query
def initialize(db_name, collection_name, query)
super(OP_QUERY)
@query = query
@collection_name = collection_name
write_int(@query.query_opts)
write_string("#{db_name}.#{collection_name}")
write_int(query.number_to_skip)
write_int(query.number_to_return)
sel = query.selector
if query.contains_special_fields
sel = OrderedHash.new
sel['query'] = query.selector
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if query.order_by
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order_by = query.order_by
sel['orderby'] = case order_by
when String then string_as_sort_parameters(order_by)
when Symbol then symbol_as_sort_parameters(order_by)
when Array then array_as_sort_parameters(order_by)
when Hash # Should be an ordered hash, but this message doesn't care
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warn_if_deprecated(order_by)
order_by
else
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raise InvalidSortValueError.new("illegal order_by: is a #{query.order_by.class.name}, must be String, Array, Hash, or OrderedHash")
end
end
sel['$hint'] = query.hint if query.hint && query.hint.length > 0
sel['$explain'] = true if query.explain
sel['$snapshot'] = true if query.snapshot
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end
write_doc(sel)
write_doc(query.fields) if query.fields
end
def first_key(key)
@first_key = key
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end
def to_s
"db.#{@collection_name}.#{@query}"
end
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end
end