mirror of https://gitee.com/bigwinds/arangodb
58 lines
1.8 KiB
C++
58 lines
1.8 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 Michael Hackstein
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_TRAVERSAL_CONDITION_FINDER_H
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#define ARANGOD_AQL_TRAVERSAL_CONDITION_FINDER_H 1
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#include "Aql/Condition.h"
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#include "Aql/ExecutionNode.h"
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#include "Aql/WalkerWorker.h"
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namespace arangodb {
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namespace aql {
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/// @brief Traversal condition finder
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class TraversalConditionFinder : public WalkerWorker<ExecutionNode> {
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public:
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TraversalConditionFinder(ExecutionPlan* plan, bool* planAltered);
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~TraversalConditionFinder() {}
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bool before(ExecutionNode*) override final;
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bool enterSubquery(ExecutionNode*, ExecutionNode*) override final;
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private:
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bool isTrueOnNull(AstNode* condition, Variable const* pathVar) const;
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private:
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ExecutionPlan* _plan;
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std::unique_ptr<Condition> _condition;
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arangodb::HashSet<VariableId> _filterVariables;
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bool* _planAltered;
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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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