mirror of https://gitee.com/bigwinds/arangodb
78 lines
2.4 KiB
C++
78 lines
2.4 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_PRUNE_EXPRESSION_EVALUATOR_H
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#define ARANGOD_AQL_PRUNE_EXPRESSION_EVALUATOR_H 1
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#include "Aql/InAndOutRowExpressionContext.h"
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#include <utility>
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namespace arangodb {
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namespace velocypack {
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class Slice;
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}
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namespace transaction {
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class Methods;
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}
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namespace aql {
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class Expression;
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class Query;
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class InputAqlItemRow;
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class PruneExpressionEvaluator {
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public:
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PruneExpressionEvaluator(transaction::Methods* trx, Query* query,
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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, Expression* expr);
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~PruneExpressionEvaluator();
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bool evaluate();
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void prepareContext(InputAqlItemRow input) { _ctx.setInputRow(std::move(input)); }
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void unPrepareContext() { _ctx.invalidateInputRow(); }
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bool needsVertex() const { return _ctx.needsVertexValue(); }
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void injectVertex(velocypack::Slice v) { _ctx.setVertexValue(v); }
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bool needsEdge() const { return _ctx.needsEdgeValue(); }
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void injectEdge(velocypack::Slice e) { _ctx.setEdgeValue(e); }
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bool needsPath() const { return _ctx.needsPathValue(); }
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void injectPath(velocypack::Slice p) { _ctx.setPathValue(p); }
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private:
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transaction::Methods* _trx;
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/// @brief The condition given in PRUNE (might be empty)
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/// The Node keeps responsibility
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aql::Expression* _pruneExpression;
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/// @brief The context used to inject variables
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InAndOutRowExpressionContext _ctx;
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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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