mirror of https://gitee.com/bigwinds/arangodb
92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2019-2019 ArangoDB 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 Michael Hackstein
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_IN_AND_OUT_ROW_EXPRESSION_CONTEXT_H
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#define ARANGOD_AQL_IN_AND_OUT_ROW_EXPRESSION_CONTEXT_H 1
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#include "QueryExpressionContext.h"
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#include "Aql/AqlValue.h"
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#include "Aql/InputAqlItemRow.h"
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namespace arangodb {
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namespace aql {
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class Query;
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/**
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* @brief Context for expression evaluation that allows
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* to read registers from Input and Output.
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* This is useful for expressions that need
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* to evaluate variables created by the active block.
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* User needs to make sure that outputblock is written to!
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*/
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class InAndOutRowExpressionContext final : public QueryExpressionContext {
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public:
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InAndOutRowExpressionContext(Query* query, std::vector<Variable const*> const&& vars,
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std::vector<RegisterId> const&& regs, size_t vertexVarIdx,
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size_t edgeVarIdx, size_t pathVarIdx);
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~InAndOutRowExpressionContext() override = default;
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void setInputRow(InputAqlItemRow input);
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void invalidateInputRow();
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size_t numRegisters() const override;
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AqlValue getVariableValue(Variable const* variable, bool doCopy,
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bool& mustDestroy) const override;
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bool needsVertexValue() const;
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bool needsEdgeValue() const;
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bool needsPathValue() const;
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/// @brief inject the result value when asked for the Vertex data
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/// This will not copy ownership of slice content. caller needs to make sure
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/// that the buffer stays valid until evaluate is called
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void setVertexValue(velocypack::Slice v);
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/// @brief inject the result value when asked for the Edge data
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/// This will not copy ownership of slice content. caller needs to make sure
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/// that the buffer stays valid until evaluate is called
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void setEdgeValue(velocypack::Slice e);
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/// @brief inject the result value when asked for the Path data
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/// This will not copy ownership of slice content. caller needs to make sure
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/// that the buffer stays valid until evaluate is called
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void setPathValue(velocypack::Slice p);
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private:
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InputAqlItemRow _input;
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std::vector<Variable const*> const _vars;
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std::vector<RegisterId> const _regs;
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size_t const _vertexVarIdx;
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size_t const _edgeVarIdx;
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size_t const _pathVarIdx;
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AqlValue _vertexValue;
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AqlValue _edgeValue;
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AqlValue _pathValue;
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};
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} // namespace aql
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} // namespace arangodb
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#endif
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