mirror of https://gitee.com/bigwinds/arangodb
88 lines
2.4 KiB
C++
88 lines
2.4 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 Max Neunhoeffer
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_ATTRIBUTE_ACCESSOR_H
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#define ARANGOD_AQL_ATTRIBUTE_ACCESSOR_H 1
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#include "Basics/Common.h"
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#include "Aql/AqlValue.h"
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#include "Aql/types.h"
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namespace arangodb {
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namespace transaction {
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class Methods;
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}
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;
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namespace aql {
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class AqlItemBlock;
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class ExpressionContext;
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struct Variable;
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/// @brief AttributeAccessor
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class AttributeAccessor {
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public:
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AttributeAccessor(std::vector<std::string>&&, Variable const*);
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~AttributeAccessor() = default;
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/// @brief execute the accessor
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AqlValue getSystem(transaction::Methods* trx, ExpressionContext* context, bool& mustDestroy);
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AqlValue getDynamic(transaction::Methods* trx, ExpressionContext* context, bool& mustDestroy);
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public:
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void replaceVariable(std::unordered_map<VariableId, Variable const*> const& replacements);
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bool isSystem() const {
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return (_type == EXTRACT_KEY || _type == EXTRACT_ID || _type == EXTRACT_FROM || _type == EXTRACT_TO);
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}
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bool isDynamic() const {
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return !isSystem();
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}
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private:
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enum AccessorType {
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EXTRACT_KEY,
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EXTRACT_ID,
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EXTRACT_FROM,
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EXTRACT_TO,
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EXTRACT_SINGLE,
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EXTRACT_MULTI
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};
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/// @brief the attribute names vector (e.g. [ "a", "b", "c" ] for a.b.c)
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std::vector<std::string> const _attributeParts;
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/// @brief the accessed variable
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Variable const* _variable;
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/// @brief type of the accessor
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AccessorType _type;
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};
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} // namespace arangodb::aql
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} // namespace arangodb
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#endif
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