mirror of https://gitee.com/bigwinds/arangodb
101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief AQL, options for COLLECT
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2010-2014 triagens GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Max Neunhoeffer
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/// @author Copyright 2014, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "Aql/AggregationOptions.h"
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#include "Basics/Exceptions.h"
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using namespace triagens::aql;
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using Json = triagens::basics::Json;
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using JsonHelper = triagens::basics::JsonHelper;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor, using JSON
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////////////////////////////////////////////////////////////////////////////////
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AggregationOptions::AggregationOptions (Json const& json) {
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Json obj = json.get("aggregationOptions");
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method = methodFromString(JsonHelper::getStringValue(obj.json(), "method", ""));
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not the hash method can be used
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////////////////////////////////////////////////////////////////////////////////
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bool AggregationOptions::canUseHashMethod () const {
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if (method == AggregationMethod::AGGREGATION_METHOD_SORTED) {
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return false;
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}
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief convert the options to JSON
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////////////////////////////////////////////////////////////////////////////////
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void AggregationOptions::toJson (triagens::basics::Json& json,
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TRI_memory_zone_t* zone) const {
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Json options;
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options = Json(Json::Object, 1)
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("method", Json(methodToString(method)));
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json("aggregationOptions", options);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the aggregation method from a string
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////////////////////////////////////////////////////////////////////////////////
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AggregationOptions::AggregationMethod AggregationOptions::methodFromString (std::string const& method) {
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if (method == "hash") {
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return AggregationMethod::AGGREGATION_METHOD_HASH;
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}
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if (method == "sorted") {
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return AggregationMethod::AGGREGATION_METHOD_SORTED;
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}
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return AggregationMethod::AGGREGATION_METHOD_UNDEFINED;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief stringify the aggregation method
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////////////////////////////////////////////////////////////////////////////////
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std::string AggregationOptions::methodToString (AggregationOptions::AggregationMethod method) {
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if (method == AggregationMethod::AGGREGATION_METHOD_HASH) {
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return std::string("hash");
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}
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if (method == AggregationMethod::AGGREGATION_METHOD_SORTED) {
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return std::string("sorted");
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}
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THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL, "cannot stringify unknown aggregation method");
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}
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