mirror of https://gitee.com/bigwinds/arangodb
148 lines
4.3 KiB
C++
148 lines
4.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 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 ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_AGGREGATOR_H
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#define ARANGOD_AQL_AGGREGATOR_H 1
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#include "Basics/Common.h"
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#include "Aql/AqlValue.h"
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#include "Basics/Exceptions.h"
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#include "Basics/JsonHelper.h"
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#include "Utils/AqlTransaction.h"
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struct TRI_document_collection_t;
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namespace triagens {
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namespace arango {
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class AqlTransaction;
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}
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namespace aql {
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struct Aggregator {
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explicit Aggregator(triagens::arango::AqlTransaction* trx) : trx(trx) { }
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virtual ~Aggregator() = default;
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virtual char const* name() const = 0;
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virtual void reset() = 0;
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virtual void reduce(AqlValue const&, struct TRI_document_collection_t const*) = 0;
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virtual AqlValue stealValue() = 0;
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static Aggregator* fromTypeString(triagens::arango::AqlTransaction*, std::string const&);
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static Aggregator* fromJson(triagens::arango::AqlTransaction*, triagens::basics::Json const&,
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char const*);
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static bool isSupported(std::string const&);
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triagens::arango::AqlTransaction* trx;
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};
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struct AggregatorLength final : public Aggregator {
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explicit AggregatorLength(triagens::arango::AqlTransaction* trx) : Aggregator(trx), count(0) { }
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AggregatorLength(triagens::arango::AqlTransaction* trx, uint64_t initialCount) : Aggregator(trx), count(initialCount) { }
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char const* name() const override final {
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return "LENGTH";
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}
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void reset() override final;
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void reduce(AqlValue const&, struct TRI_document_collection_t const*) override final;
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AqlValue stealValue() override final;
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uint64_t count;
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};
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struct AggregatorMin final : public Aggregator {
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explicit AggregatorMin(triagens::arango::AqlTransaction* trx) : Aggregator(trx), value(), coll(nullptr) { }
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~AggregatorMin();
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char const* name () const override final {
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return "MIN";
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}
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void reset() override final;
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void reduce(AqlValue const&, struct TRI_document_collection_t const*) override final;
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AqlValue stealValue() override final;
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AqlValue value;
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struct TRI_document_collection_t const* coll;
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};
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struct AggregatorMax final : public Aggregator {
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explicit AggregatorMax(triagens::arango::AqlTransaction* trx) : Aggregator(trx), value(), coll(nullptr) { }
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~AggregatorMax();
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char const* name () const override final {
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return "MAX";
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}
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void reset() override final;
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void reduce(AqlValue const&, struct TRI_document_collection_t const*) override final;
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AqlValue stealValue() override final;
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AqlValue value;
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struct TRI_document_collection_t const* coll;
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};
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struct AggregatorSum final : public Aggregator {
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explicit AggregatorSum(triagens::arango::AqlTransaction* trx) : Aggregator(trx), sum(0.0), invalid(false) { }
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~AggregatorSum();
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char const* name () const override final {
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return "SUM";
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}
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void reset() override final;
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void reduce(AqlValue const&, struct TRI_document_collection_t const*) override final;
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AqlValue stealValue() override final;
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double sum;
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bool invalid;
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};
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struct AggregatorAverage final : public Aggregator {
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explicit AggregatorAverage(triagens::arango::AqlTransaction* trx) : Aggregator(trx), count(0), sum(0.0), invalid(false) { }
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~AggregatorAverage();
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char const* name () const override final {
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return "AVERAGE";
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}
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void reset() override final;
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void reduce(AqlValue const&, struct TRI_document_collection_t const*) override final;
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AqlValue stealValue() override final;
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uint64_t count;
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double sum;
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bool invalid;
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};
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} // namespace triagens::aql
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} // namespace triagens
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#endif
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